Dallas One Wire Temperature And Humidity Sensor

Dq is 1 wire data bus should be connected to a digital pin on microcontroller.

Dallas one wire temperature and humidity sensor.

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. The connections are fairly simple. Both the supply voltage and the rh output voltage are part of the three wire connection to the humidity sensor. A keil c compiler was used to implement the firmware for the 1 wire communication.

Enough of the theory let s go practical. Every 1 wire device has a unique 64bit id. 1 wire network allows multiple devices connected on the same bus in parallel. The ds18b20 uses maxim s exclusive 1 wire bus proto col that implements bus communication using one control signal.

The th tl and configuration registers are nonvolatile eeprom so they will retain data when the device is powered down. Let s hook the ds18b20 up to the arduino. The ms th is an easy to use 1 wire temperature and humidity sensor. Other environmental sensors are available in our multisensor product line for accessories and other hardware see the products below.

Temperature to digital conversion to 9 10 11 or 12 bits. Vdd pin supplies power for the sensor which can be between 3 3 to 5v. The control line requires a weak pullup resistor. The sensor communicates over a 1 wire bus.

Gnd is a ground pin. Wiring ds18b20 temperature sensor to arduino. 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.