mirror of https://github.com/arendst/Tasmota.git
Added Adafruit MX31865 Library to Repo
Added a #define to compensate for low quality PTD probes
This commit is contained in:
Alberto Lopez
parent
2b4d2f5bba
commit
60198127ba
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Subproject commit 83027ecdd5c8e059510fcca5f230451c55ad078a
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/***************************************************
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This is a library for the Adafruit PT100/P1000 RTD Sensor w/MAX31865
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Designed specifically to work with the Adafruit RTD Sensor
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----> https://www.adafruit.com/products/3328
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This sensor uses SPI to communicate, 4 pins are required to
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interface
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Adafruit invests time and resources providing this open source code,
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please support Adafruit and open-source hardware by purchasing
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products from Adafruit!
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||||
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Written by Limor Fried/Ladyada for Adafruit Industries.
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BSD license, all text above must be included in any redistribution
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****************************************************/
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#include "Adafruit_MAX31865.h"
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#ifdef __AVR
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#include <avr/pgmspace.h>
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#elif defined(ESP8266)
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#include <pgmspace.h>
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#endif
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#include <stdlib.h>
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#include <SPI.h>
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static SPISettings max31865_spisettings = SPISettings(500000, MSBFIRST, SPI_MODE1);
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// Software (bitbang) SPI
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Adafruit_MAX31865::Adafruit_MAX31865(int8_t spi_cs, int8_t spi_mosi, int8_t spi_miso, int8_t spi_clk) {
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setPins( spi_cs, spi_mosi, spi_miso, spi_clk);
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}
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void Adafruit_MAX31865::setPins(int8_t spi_cs, int8_t spi_mosi, int8_t spi_miso, int8_t spi_clk) {
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_sclk = spi_clk;
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_cs = spi_cs;
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_miso = spi_miso;
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_mosi = spi_mosi;
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}
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// Hardware SPI init
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Adafruit_MAX31865::Adafruit_MAX31865(int8_t spi_cs) {
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_cs = spi_cs;
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_sclk = _miso = _mosi = -1;
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}
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// Default constructor
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Adafruit_MAX31865::Adafruit_MAX31865(void) {
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_cs = _sclk = _miso = _mosi = -1;
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}
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boolean Adafruit_MAX31865::begin(max31865_numwires_t wires) {
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pinMode(_cs, OUTPUT);
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digitalWrite(_cs, HIGH);
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if (_sclk != -1) {
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//define pin modes
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pinMode(_sclk, OUTPUT);
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digitalWrite(_sclk, LOW);
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pinMode(_mosi, OUTPUT);
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pinMode(_miso, INPUT);
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} else {
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//start and configure hardware SPI
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SPI.begin();
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}
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for (uint8_t i=0; i<16; i++) {
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// readRegister8(i);
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}
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setWires(wires);
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enableBias(false);
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autoConvert(false);
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clearFault();
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//Serial.print("config: "); Serial.println(readRegister8(MAX31856_CONFIG_REG), HEX);
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return true;
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}
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uint8_t Adafruit_MAX31865::readFault(void) {
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return readRegister8(MAX31856_FAULTSTAT_REG);
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}
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void Adafruit_MAX31865::clearFault(void) {
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uint8_t t = readRegister8(MAX31856_CONFIG_REG);
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t &= ~0x2C;
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t |= MAX31856_CONFIG_FAULTSTAT;
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writeRegister8(MAX31856_CONFIG_REG, t);
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}
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void Adafruit_MAX31865::enableBias(boolean b) {
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uint8_t t = readRegister8(MAX31856_CONFIG_REG);
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if (b) {
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t |= MAX31856_CONFIG_BIAS; // enable bias
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} else {
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t &= ~MAX31856_CONFIG_BIAS; // disable bias
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}
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writeRegister8(MAX31856_CONFIG_REG, t);
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}
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void Adafruit_MAX31865::autoConvert(boolean b) {
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uint8_t t = readRegister8(MAX31856_CONFIG_REG);
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if (b) {
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t |= MAX31856_CONFIG_MODEAUTO; // enable autoconvert
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} else {
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t &= ~MAX31856_CONFIG_MODEAUTO; // disable autoconvert
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}
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writeRegister8(MAX31856_CONFIG_REG, t);
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}
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void Adafruit_MAX31865::setWires(max31865_numwires_t wires ) {
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uint8_t t = readRegister8(MAX31856_CONFIG_REG);
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if (wires == MAX31865_3WIRE) {
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t |= MAX31856_CONFIG_3WIRE;
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} else {
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// 2 or 4 wire
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t &= ~MAX31856_CONFIG_3WIRE;
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}
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writeRegister8(MAX31856_CONFIG_REG, t);
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}
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float Adafruit_MAX31865::rtd_to_temperature(uint16_t rtd, float RTDnominal, float refResistor) {
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//float Adafruit_MAX31865::temperature(float RTDnominal, float refResistor) {
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// http://www.analog.com/media/en/technical-documentation/application-notes/AN709_0.pdf
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float Z1, Z2, Z3, Z4, Rt, temp;
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Rt = rtd;
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Rt /= 32768;
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Rt *= refResistor;
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// Serial.print("\nResistance: "); Serial.println(Rt, 8);
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Z1 = -RTD_A;
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Z2 = RTD_A * RTD_A - (4 * RTD_B);
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Z3 = (4 * RTD_B) / RTDnominal;
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Z4 = 2 * RTD_B;
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temp = Z2 + (Z3 * Rt);
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temp = (sqrt(temp) + Z1) / Z4;
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if (temp >= 0) return temp;
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// ugh.
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Rt /= RTDnominal;
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Rt *= 100; // normalize to 100 ohm
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float rpoly = Rt;
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temp = -242.02;
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temp += 2.2228 * rpoly;
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rpoly *= Rt; // square
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temp += 2.5859e-3 * rpoly;
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rpoly *= Rt; // ^3
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temp -= 4.8260e-6 * rpoly;
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rpoly *= Rt; // ^4
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temp -= 2.8183e-8 * rpoly;
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rpoly *= Rt; // ^5
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temp += 1.5243e-10 * rpoly;
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return temp;
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}
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float Adafruit_MAX31865::rtd_to_resistance(uint16_t rtd, float refResistor) {
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float Rt;
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Rt = rtd;
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Rt /= 32768;
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Rt *= refResistor;
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return Rt;
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}
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float Adafruit_MAX31865::temperature(float RTDnominal, float refResistor) {
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uint16_t rtd = readRTD();
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return rtd_to_temperature(rtd, RTDnominal, refResistor);
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}
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uint16_t Adafruit_MAX31865::readRTD (void) {
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clearFault();
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enableBias(true);
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delay(10);
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uint8_t t = readRegister8(MAX31856_CONFIG_REG);
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t |= MAX31856_CONFIG_1SHOT;
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writeRegister8(MAX31856_CONFIG_REG, t);
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delay(65);
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uint16_t rtd = readRegister16(MAX31856_RTDMSB_REG);
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// remove fault
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rtd >>= 1;
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return rtd;
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}
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/**********************************************/
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uint8_t Adafruit_MAX31865::readRegister8(uint8_t addr) {
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uint8_t ret = 0;
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readRegisterN(addr, &ret, 1);
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return ret;
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}
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uint16_t Adafruit_MAX31865::readRegister16(uint8_t addr) {
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uint8_t buffer[2] = {0, 0};
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readRegisterN(addr, buffer, 2);
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uint16_t ret = buffer[0];
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ret <<= 8;
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ret |= buffer[1];
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return ret;
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}
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void Adafruit_MAX31865::readRegisterN(uint8_t addr, uint8_t buffer[], uint8_t n) {
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addr &= 0x7F; // make sure top bit is not set
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if (_sclk == -1)
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SPI.beginTransaction(max31865_spisettings);
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else
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digitalWrite(_sclk, LOW);
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digitalWrite(_cs, LOW);
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spixfer(addr);
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//Serial.print("$"); Serial.print(addr, HEX); Serial.print(": ");
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while (n--) {
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buffer[0] = spixfer(0xFF);
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//Serial.print(" 0x"); Serial.print(buffer[0], HEX);
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buffer++;
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}
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//Serial.println();
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if (_sclk == -1)
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SPI.endTransaction();
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digitalWrite(_cs, HIGH);
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}
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void Adafruit_MAX31865::writeRegister8(uint8_t addr, uint8_t data) {
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if (_sclk == -1)
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SPI.beginTransaction(max31865_spisettings);
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else
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digitalWrite(_sclk, LOW);
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digitalWrite(_cs, LOW);
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spixfer(addr | 0x80); // make sure top bit is set
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spixfer(data);
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//Serial.print("$"); Serial.print(addr, HEX); Serial.print(" = 0x"); Serial.println(data, HEX);
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if (_sclk == -1)
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SPI.endTransaction();
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digitalWrite(_cs, HIGH);
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}
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uint8_t Adafruit_MAX31865::spixfer(uint8_t x) {
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if (_sclk == -1)
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return SPI.transfer(x);
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// software spi
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//Serial.println("Software SPI");
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uint8_t reply = 0;
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for (int i=7; i>=0; i--) {
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reply <<= 1;
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digitalWrite(_sclk, HIGH);
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digitalWrite(_mosi, x & (1<<i));
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digitalWrite(_sclk, LOW);
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if (digitalRead(_miso))
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reply |= 1;
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}
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return reply;
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}
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@ -0,0 +1,99 @@
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/***************************************************
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This is a library for the Adafruit PT100/P1000 RTD Sensor w/MAX31865
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Designed specifically to work with the Adafruit RTD Sensor
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----> https://www.adafruit.com/products/3328
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This sensor uses SPI to communicate, 4 pins are required to
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interface
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Adafruit invests time and resources providing this open source code,
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please support Adafruit and open-source hardware by purchasing
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products from Adafruit!
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||||
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Written by Limor Fried/Ladyada for Adafruit Industries.
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BSD license, all text above must be included in any redistribution
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****************************************************/
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#ifndef ADAFRUIT_MAX31865_H
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#define ADAFRUIT_MAX31865_H
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#define MAX31856_CONFIG_REG 0x00
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#define MAX31856_CONFIG_BIAS 0x80
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#define MAX31856_CONFIG_MODEAUTO 0x40
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#define MAX31856_CONFIG_MODEOFF 0x00
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#define MAX31856_CONFIG_1SHOT 0x20
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#define MAX31856_CONFIG_3WIRE 0x10
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#define MAX31856_CONFIG_24WIRE 0x00
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#define MAX31856_CONFIG_FAULTSTAT 0x02
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#define MAX31856_CONFIG_FILT50HZ 0x01
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#define MAX31856_CONFIG_FILT60HZ 0x00
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#define MAX31856_RTDMSB_REG 0x01
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#define MAX31856_RTDLSB_REG 0x02
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#define MAX31856_HFAULTMSB_REG 0x03
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#define MAX31856_HFAULTLSB_REG 0x04
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#define MAX31856_LFAULTMSB_REG 0x05
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#define MAX31856_LFAULTLSB_REG 0x06
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#define MAX31856_FAULTSTAT_REG 0x07
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#define MAX31865_FAULT_HIGHTHRESH 0x80
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#define MAX31865_FAULT_LOWTHRESH 0x40
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#define MAX31865_FAULT_REFINLOW 0x20
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#define MAX31865_FAULT_REFINHIGH 0x10
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#define MAX31865_FAULT_RTDINLOW 0x08
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#define MAX31865_FAULT_OVUV 0x04
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#define RTD_A 3.9083e-3
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#define RTD_B -5.775e-7
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#if (ARDUINO >= 100)
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#include "Arduino.h"
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#else
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#include "WProgram.h"
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#endif
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typedef enum max31865_numwires {
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MAX31865_2WIRE = 0,
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MAX31865_3WIRE = 1,
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MAX31865_4WIRE = 0
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} max31865_numwires_t;
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class Adafruit_MAX31865 {
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public:
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Adafruit_MAX31865(int8_t spi_cs, int8_t spi_mosi, int8_t spi_miso, int8_t spi_clk);
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Adafruit_MAX31865(int8_t spi_cs);
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Adafruit_MAX31865(void);
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void setPins(int8_t spi_cs, int8_t spi_mosi, int8_t spi_miso, int8_t spi_clk);
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boolean begin(max31865_numwires_t x = MAX31865_2WIRE);
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uint8_t readFault(void);
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void clearFault(void);
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uint16_t readRTD();
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void setWires(max31865_numwires_t wires);
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void autoConvert(boolean b);
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void enableBias(boolean b);
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float temperature(float RTDnominal, float refResistor);
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float rtd_to_temperature(uint16_t rtd, float RTDnominal, float refResistor);
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float rtd_to_resistance(uint16_t rtd, float refResistor);
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private:
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int8_t _sclk, _miso, _mosi, _cs;
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void readRegisterN(uint8_t addr, uint8_t buffer[], uint8_t n);
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uint8_t readRegister8(uint8_t addr);
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uint16_t readRegister16(uint8_t addr);
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void writeRegister8(uint8_t addr, uint8_t reg);
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uint8_t spixfer(uint8_t addr);
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};
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#endif
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@ -0,0 +1,2 @@
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# Adafruit_MAX31865
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Arduino Library for Adafruit MAX31865 RTD Sensor
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@ -0,0 +1,16 @@
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This is the Adafruit MAX31856 Arduino Library
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Tested and works great with the Adafruit Thermocouple Breakout w/MAX31856
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* http://www.adafruit.com/products/3328
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These sensors use SPI to communicate, 4 pins are required to
|
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interface
|
||||
|
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Adafruit invests time and resources providing this open source code,
|
||||
please support Adafruit and open-source hardware by purchasing
|
||||
products from Adafruit!
|
||||
|
||||
Written by Limor Fried/Ladyada for Adafruit Industries.
|
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BSD license, check license.txt for more information
|
||||
All text above must be included in any redistribution
|
||||
|
|
@ -0,0 +1,74 @@
|
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/***************************************************
|
||||
This is a library for the Adafruit PT100/P1000 RTD Sensor w/MAX31865
|
||||
|
||||
Designed specifically to work with the Adafruit RTD Sensor
|
||||
----> https://www.adafruit.com/products/3328
|
||||
|
||||
This sensor uses SPI to communicate, 4 pins are required to
|
||||
interface
|
||||
Adafruit invests time and resources providing this open source code,
|
||||
please support Adafruit and open-source hardware by purchasing
|
||||
products from Adafruit!
|
||||
|
||||
Written by Limor Fried/Ladyada for Adafruit Industries.
|
||||
BSD license, all text above must be included in any redistribution
|
||||
****************************************************/
|
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#include <Adafruit_MAX31865.h>
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// Use software SPI: CS, DI, DO, CLK
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Adafruit_MAX31865 max = Adafruit_MAX31865(10, 11, 12, 13);
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// use hardware SPI, just pass in the CS pin
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//Adafruit_MAX31865 max = Adafruit_MAX31865(10);
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// The value of the Rref resistor. Use 430.0 for PT100 and 4300.0 for PT1000
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#define RREF 430.0
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// The 'nominal' 0-degrees-C resistance of the sensor
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// 100.0 for PT100, 1000.0 for PT1000
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#define RNOMINAL 100.0
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void setup() {
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Serial.begin(115200);
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Serial.println("Adafruit MAX31865 PT100 Sensor Test!");
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max.begin(MAX31865_3WIRE); // set to 2WIRE or 4WIRE as necessary
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}
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void loop() {
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uint16_t rtd = max.readRTD();
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Serial.print("RTD value: "); Serial.println(rtd);
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float ratio = rtd;
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ratio /= 32768;
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Serial.print("Ratio = "); Serial.println(ratio,8);
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Serial.print("Resistance = "); Serial.println(RREF*ratio,8);
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Serial.print("Temperature = "); Serial.println(max.temperature(RNOMINAL, RREF));
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// Check and print any faults
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uint8_t fault = max.readFault();
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if (fault) {
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Serial.print("Fault 0x"); Serial.println(fault, HEX);
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if (fault & MAX31865_FAULT_HIGHTHRESH) {
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Serial.println("RTD High Threshold");
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}
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if (fault & MAX31865_FAULT_LOWTHRESH) {
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Serial.println("RTD Low Threshold");
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}
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if (fault & MAX31865_FAULT_REFINLOW) {
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Serial.println("REFIN- > 0.85 x Bias");
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}
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if (fault & MAX31865_FAULT_REFINHIGH) {
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Serial.println("REFIN- < 0.85 x Bias - FORCE- open");
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}
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if (fault & MAX31865_FAULT_RTDINLOW) {
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Serial.println("RTDIN- < 0.85 x Bias - FORCE- open");
|
||||
}
|
||||
if (fault & MAX31865_FAULT_OVUV) {
|
||||
Serial.println("Under/Over voltage");
|
||||
}
|
||||
max.clearFault();
|
||||
}
|
||||
Serial.println();
|
||||
delay(1000);
|
||||
}
|
||||
|
|
@ -0,0 +1,9 @@
|
|||
name=Adafruit MAX31865 library
|
||||
version=1.0.1
|
||||
author=Adafruit
|
||||
maintainer=Adafruit <info@adafruit.com>
|
||||
sentence=Library for the Adafruit RTD Amplifier breakout with MAX31865
|
||||
paragraph=Library for the Adafruit RTD Amplifier breakout with MAX31865
|
||||
category=Sensors
|
||||
url=https://github.com/adafruit/Adafruit_MAX31865
|
||||
architectures=*
|
||||
|
|
@ -433,6 +433,7 @@
|
|||
#define MAX31865_PTD_WIRES 2 // PTDs come in several flavors. Pick yours
|
||||
#define MAX31865_PTD_RES 100 // Nominal PTD resistance at 0°C (100Ω for a PT100, 1000Ω for a PT1000, YMMV!)
|
||||
#define MAX31865_REF_RES 430 // Reference resistor (Usually 430Ω for a PT100, 4300Ω for a PT1000)
|
||||
#define MAX31865_PTD_BIAS -6.6 // To calibrate your not-so-good PTD
|
||||
#endif
|
||||
|
||||
// -- IR Remote features --------------------------
|
||||
|
|
|
|||
|
|
@ -36,7 +36,8 @@ Adafruit_MAX31865 max31865;
|
|||
|
||||
struct MAX31865_Result_Struct {
|
||||
uint8_t ErrorCode;
|
||||
uint16_t PtdResistance;
|
||||
uint16_t Rtd;
|
||||
float PtdResistance;
|
||||
float PtdTemp;
|
||||
} MAX31865_Result;
|
||||
|
||||
|
|
@ -62,20 +63,26 @@ void MAX31865_Init(void){
|
|||
* Acquires the raw data via SPI, checks for MAX31865 errors and fills result structure
|
||||
*/
|
||||
void MAX31865_GetResult(void){
|
||||
MAX31865_Result.PtdResistance = max31865.readRTD();
|
||||
MAX31865_Result.PtdTemp = max31865.rtd_to_temperature(MAX31865_Result.PtdResistance, MAX31865_PTD_RES, MAX31865_REF_RES);
|
||||
uint16_t rtd;
|
||||
|
||||
rtd = max31865.readRTD();
|
||||
MAX31865_Result.Rtd = rtd;
|
||||
MAX31865_Result.PtdResistance = max31865.rtd_to_resistance(rtd, MAX31865_REF_RES);
|
||||
MAX31865_Result.PtdTemp = max31865.rtd_to_temperature(rtd, MAX31865_PTD_RES, MAX31865_REF_RES) + MAX31865_PTD_BIAS;
|
||||
}
|
||||
|
||||
void MAX31865_Show(bool Json){
|
||||
char temperature[33];
|
||||
char resistance[33];
|
||||
char srtd[33];
|
||||
|
||||
sprintf(resistance, "%ld", MAX31865_Result.PtdResistance);
|
||||
sprintf(srtd, "%d", MAX31865_Result.Rtd);
|
||||
dtostrfd(MAX31865_Result.PtdResistance, Settings.flag2.temperature_resolution, resistance);
|
||||
dtostrfd(MAX31865_Result.PtdTemp, Settings.flag2.temperature_resolution, temperature);
|
||||
|
||||
if(Json){
|
||||
ResponseAppend_P(PSTR(",\"MAX31865\":{\"" D_JSON_TEMPERATURE "\":%s,\"" D_JSON_RESISTANCE "\":%s,\"" D_JSON_ERROR "\":%d}"), \
|
||||
temperature, resistance, MAX31865_Result.ErrorCode);
|
||||
ResponseAppend_P(PSTR(",\"MAX31865\":{\"" D_JSON_TEMPERATURE "\":%s,\"" D_JSON_RESISTANCE "\":%s,\"RTD\":%s,\"" D_JSON_ERROR "\":%d}"), \
|
||||
temperature, resistance, srtd, MAX31865_Result.ErrorCode);
|
||||
#ifdef USE_DOMOTICZ
|
||||
if (0 == tele_period) {
|
||||
DomoticzSensor(DZ_TEMP, temperature);
|
||||
|
|
|
|||
Loading…
Reference in New Issue