mirror of https://github.com/arendst/Tasmota.git
75 lines
2.4 KiB
Arduino
75 lines
2.4 KiB
Arduino
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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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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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// 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");
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}
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if (fault & MAX31865_FAULT_OVUV) {
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Serial.println("Under/Over voltage");
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}
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max.clearFault();
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}
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Serial.println();
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delay(1000);
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}
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