DFR0024

    18B20 Temperature Sensor V2 SKU: DFR0024            From Robot Wiki   Contents     1 Introduction  2 Specification  3 Connection Diagram  4 Sample Code  Introduction DS18B20 is a digital temperature sensor which is from DALLAS U.S. It can be used to quantify the environmental temperature testing. The temperature range -55 ~ +125 , the inherent temperature resolution of 0.5 , support multi-point networking mesh. Three DS18B20 can deloyed on three lines, to achieve multi-point temperature measurement. It has a 9-12 bit serial output. Specification     Supply Voltage: 3.3V to 5V  Temperature range :‐55 °C ~ +125 °C  Interface: Digital  Size:22x32mm  Connection Diagram   Sample Code #include int DS18S20_Pin = 2; //DS18S20 Signal pin on digital 2 //Temperature chip i/o OneWire ds(DS18S20_Pin); void setup(void) { Serial.begin(9600); } void loop(void) { // on digital pin 2 float temperature = getTemp(); Serial.println(temperature); delay(100); //just here to slow down the output so it is easier to read } 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