Daily Archives: March 12, 2010

Arduino and DS18B20 – 1-wire digital thermometer 6

Finally got this DS18B20 working. Actually three of them. And in two modes. Parasite power mode and main mode. A 4.7K ohm resistor is the key. Starting with the main mode, three wires are needed, as this sensor has three pins. Datasheet is here http://datasheets.maxim-ic.com/en/ds/DS18B20.pdf. Connection is almost simple. Pin 1 to Arduino ground Pin 2 to Arduino digital input Pin 3 to Arduino 5V And a 4.7K resistor between pin 2 and pin 3 Works with three wires, as seen on the followind illustration.