Dallas One Wire Temperature And Humidity Sensor

1 wire network allows multiple devices connected on the same bus in parallel.

Dallas one wire temperature and humidity sensor.

Vdd pin supplies power for the sensor which can be between 3 3 to 5v. Both the supply voltage and the rh output voltage are part of the three wire connection to the humidity sensor. Let s hook the ds18b20 up to the arduino. Each sensor has a unique 64 bit serial code which allows multiple sensors to be connected on the same 1 wire bus.

Gnd is a ground pin. The th tl and configuration registers are nonvolatile eeprom so they will retain data when the device is powered down. A keil c compiler was used to implement the firmware for the 1 wire communication. Every 1 wire device has a unique 64bit id.

The ds18b20 uses maxim s exclusive 1 wire bus proto col that implements bus communication using one control signal. Dq is 1 wire data bus should be connected to a digital pin on microcontroller. Tsh202 is a 1 wire humidity and temperature sensor. Wiring ds18b20 temperature sensor to arduino.

The control line requires a weak pullup resistor. Using the plug and play technology the ms th can be daisy chained with other 1 wire products to create a low power environmental sensor network. The sensor communicates over a 1 wire bus. Enough of the theory let s go practical.

Temperature to digital conversion to 9 10 11 or 12 bits. Other environmental sensors are available in our multisensor product line for accessories and other hardware see the products below. 1 wire humidity and temperature sensor is a low cost open source device for measuring temperature and relative air humidity in 1 wire micro lan network.