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- float getTemp() {
- //returns the temperature from one DS18S20 in DEG Celsius
- byte data[12];
- byte addr[8];
- if ( !ds.search(addr)) {
- //no more sensors on chain, reset search
- ds.reset_search();
- return -1000;
- }
- if ( OneWire::crc8( addr, 7) != addr[7]) {
- // Serial.println("CRC is not valid!");
- return -1000;
- }
- if ( addr[0] != 0x10 && addr[0] != 0x28) {
- // Serial.print("Device is not recognized");
- return -1000;
- }
- ds.reset();
- ds.select(addr);
- ds.write(0x44, 1); // start conversion, with parasite power on at the end
- byte present = ds.reset();
- ds.select(addr);
- ds.write(0xBE); // Read Scratchpad
- for (int i = 0; i < 9; i++) { // we need 9 bytes
- data[i] = ds.read();
- }
- ds.reset_search();
- byte MSB = data[1];
- byte LSB = data[0];
- float tempRead = ((MSB << 8) | LSB); //using two's compliment
- float TemperatureSum = tempRead / 16;
- return TemperatureSum;
- }
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