Humidity and temperature sensor
This board is compatible with both DHT11 and DHT22 humidity and temperature sensors. The output is serial data. A comprehensive overview of both sensors and their application with ESP32: https://randomnerdtutorials.com/esp32-dht11-dht22-temperature-humidity-sensor-arduino-ide/
A comparison table taken from randomnerdtutorials.com (full link above)
| DHT11 | DHT22 | |
|---|---|---|
| Temperature range | 0 to 50 ºC +/-2 ºC | -40 to 80 ºC +/-0.5ºC |
| Humidity range | 20 to 90% +/-5% | 0 to 100% +/-2% |
| Resolution | Humidity: 1% Temperature: 1ºC |
Humidity: 0.1% Temperature: 0.1ºC |
| Operating voltage | 3 – 5.5 V DC | 3 – 6 V DC |
| Current supply | 0.5 – 2.5 mA | 1 – 1.5 mA |
| Sampling period | 1 second | 2 seconds |
To work with either sensor, the following libraries should be installed:
https://github.com/adafruit/Adafruit_Sensor - It is needed to install the DHT library
https://github.com/adafruit/DHT-sensor-library - DHT library from Adafruit
Do not connect or disconnect connectors while power is ON. All adjustments must be done ONLY when power is OFF.
Check the temperature sensor before using it in an experiment.
If temperature readings during an experiment differ slightly from theoretical data, consider stopping the experiment and looking into this issue.
If temperature readings during an experiment differ highly from theoretical data, consider stopping the experiment straight away and informing your safety officer about the incident.
