DHT22 with Raspberry Pi Pico

Wiring for the DHT22 (AM2302) temperature + humidity on the Raspberry Pi Pico (RP2040, 3.3 V logic), chosen with the same pin rules BoardPilot uses: default buses first, and no pins that are used for flash, USB, the debugger or booting.

Wiring

DHT22 pin	Role	Raspberry Pi Pico pin	Notes
VCC	Power	3V3(OUT)
DATA	One-wire data	GP15	Needs a 10 kΩ pull-up (included on 3-pin modules)
GND	Ground	GND

Check before you power it on

Supply: 3.3 V from the 3V3(OUT) pin.

Test code (Arduino)

// Library: DHT sensor library (Adafruit)
#include <DHT.h>

DHT dht(15, DHT22);

void setup() {
  Serial.begin(115200);
  dht.begin();
}

void loop() {
  delay(2000);  // the DHT22 needs 2 s between readings
  Serial.print(dht.readTemperature());
  Serial.print(" C  ");
  Serial.print(dht.readHumidity());
  Serial.println(" %");
}

Arduino board: rp2040:rp2040:rpipico. If the board is not found, hold the BOOTSEL button while plugging in the USB cable.

Questions

Which Raspberry Pi Pico pins do I use for the DHT22?

VCC → 3V3(OUT), DATA → GP15, GND → GND.

Does the DHT22 work with the Raspberry Pi Pico at 3.3 V?

Yes: the DHT22 runs at 3.3-5 V and the Raspberry Pi Pico uses 3.3 V signals, so no level shifting is needed.

BoardPilot checks this wiring in 3D as you build it, and finds crossed or missing wires on the real board.

Download BoardPilot

Full Raspberry Pi Pico pinout · DHT22 (AM2302) temperature + humidity: all pins and data

The DHT22 on other boards

ESP32 DevKit Arduino Mega 2560 R3 Arduino Nano Arduino Uno R3 WeAct Black Pill STM32F411CE ESP32-C3-DevKitM-1 ESP32-S3-DevKitC-1 Nordic nRF52840 DK NUCLEO-F401RE Raspberry Pi Pico 2 Raspberry Pi Pico W Teensy 4.1

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