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. The ms th is an easy to use 1 wire temperature and humidity sensor. Tsh202 is a 1 wire humidity and temperature sensor. It provides a low cost option for humidity and temperature monitoring. Let s hook the ds18b20 up to the arduino.

A keil c compiler was used to implement the firmware for the 1 wire communication. The ds18b20 uses maxim s exclusive 1 wire bus proto col that implements bus communication using one control signal. Vdd pin supplies power for the sensor which can be between 3 3 to 5v. Enough of the theory let s go practical.

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. 1 wire network allows multiple devices connected on the same bus in parallel. Both the supply voltage and the rh output voltage are part of the three wire connection to the humidity sensor. The th tl and configuration registers are nonvolatile eeprom so they will retain data when the device is powered down.

The connections are fairly simple. Every 1 wire device has a unique 64bit id. Gnd is a ground pin. 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. Each sensor has a unique 64 bit serial code which allows multiple sensors to be connected on the same 1 wire bus. Temperature to digital conversion to 9 10 11 or 12 bits.