ESP32 and LM35 temperature sensor In this example we will connect an LM35 temperature sensor to our ESP32 module The LM35 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. ESP32 WiFi SOIL MOISTURE SENSOR: Cheap soil moisture sensors which send an electrical signal through soil to measure the resistance of the soil is all failing. Electrolysis makes this sensors of no practical use. See more about electrolysis here. The sensor used in this project i... 13. Temperature and Humidity¶ DHT (Digital Humidity & Temperature) sensors are low cost digital sensors with capacitive humidity sensors and thermistors to measure the surrounding air. They feature a chip that handles analog to digital conversion and provide a 1-wire interface. Newer sensors additionally provide an I2C interface.