mirror of https://github.com/arendst/Tasmota.git
113 lines
3.0 KiB
Plaintext
113 lines
3.0 KiB
Plaintext
#include <OneWire.h>
|
|
|
|
// OneWire DS18S20, DS18B20, DS1822 Temperature Example
|
|
//
|
|
// http://www.pjrc.com/teensy/td_libs_OneWire.html
|
|
//
|
|
// The DallasTemperature library can do all this work for you!
|
|
// http://milesburton.com/Dallas_Temperature_Control_Library
|
|
|
|
OneWire ds(10); // on pin 10 (a 4.7K resistor is necessary)
|
|
|
|
void setup(void) {
|
|
Serial.begin(9600);
|
|
}
|
|
|
|
void loop(void) {
|
|
byte i;
|
|
byte present = 0;
|
|
byte type_s;
|
|
byte data[12];
|
|
byte addr[8];
|
|
float celsius, fahrenheit;
|
|
|
|
if ( !ds.search(addr)) {
|
|
Serial.println("No more addresses.");
|
|
Serial.println();
|
|
ds.reset_search();
|
|
delay(250);
|
|
return;
|
|
}
|
|
|
|
Serial.print("ROM =");
|
|
for( i = 0; i < 8; i++) {
|
|
Serial.write(' ');
|
|
Serial.print(addr[i], HEX);
|
|
}
|
|
|
|
if (OneWire::crc8(addr, 7) != addr[7]) {
|
|
Serial.println("CRC is not valid!");
|
|
return;
|
|
}
|
|
Serial.println();
|
|
|
|
// the first ROM byte indicates which chip
|
|
switch (addr[0]) {
|
|
case 0x10:
|
|
Serial.println(" Chip = DS18S20"); // or old DS1820
|
|
type_s = 1;
|
|
break;
|
|
case 0x28:
|
|
Serial.println(" Chip = DS18B20");
|
|
type_s = 0;
|
|
break;
|
|
case 0x22:
|
|
Serial.println(" Chip = DS1822");
|
|
type_s = 0;
|
|
break;
|
|
default:
|
|
Serial.println("Device is not a DS18x20 family device.");
|
|
return;
|
|
}
|
|
|
|
ds.reset();
|
|
ds.select(addr);
|
|
ds.write(0x44, 1); // start conversion, with parasite power on at the end
|
|
|
|
delay(1000); // maybe 750ms is enough, maybe not
|
|
// we might do a ds.depower() here, but the reset will take care of it.
|
|
|
|
present = ds.reset();
|
|
ds.select(addr);
|
|
ds.write(0xBE); // Read Scratchpad
|
|
|
|
Serial.print(" Data = ");
|
|
Serial.print(present, HEX);
|
|
Serial.print(" ");
|
|
for ( i = 0; i < 9; i++) { // we need 9 bytes
|
|
data[i] = ds.read();
|
|
Serial.print(data[i], HEX);
|
|
Serial.print(" ");
|
|
}
|
|
Serial.print(" CRC=");
|
|
Serial.print(OneWire::crc8(data, 8), HEX);
|
|
Serial.println();
|
|
|
|
// Convert the data to actual temperature
|
|
// because the result is a 16 bit signed integer, it should
|
|
// be stored to an "int16_t" type, which is always 16 bits
|
|
// even when compiled on a 32 bit processor.
|
|
int16_t raw = (data[1] << 8) | data[0];
|
|
if (type_s) {
|
|
raw = raw << 3; // 9 bit resolution default
|
|
if (data[7] == 0x10) {
|
|
// "count remain" gives full 12 bit resolution
|
|
raw = (raw & 0xFFF0) + 12 - data[6];
|
|
}
|
|
} else {
|
|
byte cfg = (data[4] & 0x60);
|
|
// at lower res, the low bits are undefined, so let's zero them
|
|
if (cfg == 0x00) raw = raw & ~7; // 9 bit resolution, 93.75 ms
|
|
else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
|
|
else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
|
|
//// default is 12 bit resolution, 750 ms conversion time
|
|
}
|
|
celsius = (float)raw / 16.0;
|
|
fahrenheit = celsius * 1.8 + 32.0;
|
|
Serial.print(" Temperature = ");
|
|
Serial.print(celsius);
|
|
Serial.print(" Celsius, ");
|
|
Serial.print(fahrenheit);
|
|
Serial.println(" Fahrenheit");
|
|
}
|