The DHT11 is a basic, ultra low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and sends a digital...

The DHT-22 is a low cost humidity and temperature sensor with a single wire digital interface. The sensor is calibrated and doesn’t require extra components so you can get right...

Photocell’s are light-sensitive, variable resistors. If you need a way to sense the level of ambient light, then there is no easier way to do it. As the light on...