Practical Contiki-NG by Agus Kurniawan

Author:Agus Kurniawan
Language: eng
Format: epub, pdf
Publisher: Apress, Berkeley, CA

In general, SHT1x provides two-wire pins to be used to access sensor data. If you see a SparkFun Humidity and Temperature Sensor Breakout (Figure 5-3), this module has four pins: VCC, GND, DATA, and SCK. We can develop a program to access this sensor data from MCU.

We also can use a low-cost humidity and temperature sensor. It’s the DHT22 module. This sensor is easier to find. You can check it out on the SparkFun website at https://www.sparkfun.com/products/10167 ; it is called Humidity and Temperature Sensor—RHT03 (DHT22). The DHT22 sensor provides a single-wire digital interface that is used to access sensor data for temperature and humidity. The DHT22 sensor form is shown in Figure 5-4.

Figure 5-4Humidity and Temperature Sensor—RHT03 (DHT22)

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