This is a C library for working with DHT temperature & humidity sensors on the Raspberry Pi Pico and similar RP2040 based boards. It supports DHT11, DHT12, DHT21, and DHT22 through the one-wire interface.
A PIO state machine is used to communicate with the sensor, leaving the CPU cores available for other tasks. Sounds like overkill, but hey: it's bit banging and what the PIOs are designed for!
The example program prints temperature and humidity every 2 seconds.
| DHT pin | Raspberry Pi Pico pin |
|---|---|
| VDD | 3V3(OUT) |
| SDA | GP15 |
| GND | GND |
Most DHT modules have a built-in pull-up. The example program also enables the internal pull-up, so an external resistor is not required.
Follow the instructions in Getting started with Raspberry Pi Pico to setup your build environment. Then:
git clone https://github.com/vmilea/pico_dhtcd pico_dht- change
DHT_MODELindht_example.cif needed (default is DHT22) mkdir build,cd build,cmake ..,make- copy
dht_example.uf2to Raspberry Pico - open a serial connection and check output
Valentin Milea valentin.milea@gmail.com