DHT22 with Arduino Nano

Wiring for the DHT22 (AM2302) temperature + humidity on the Arduino Nano (ATmega328P, 5 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

Check before you power it on

• Supply: 5 V from the 5V pin.

Test code (Arduino)

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

DHT dht(2, 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: arduino:avr:nano. Clones with the old bootloader upload at 57600 baud: choose “ATmega328P (Old Bootloader)” if uploads fail.

Questions

Which Arduino Nano pins do I use for the DHT22?

VCC → 5V, DATA → D2 (PD2), GND → GND.

Does the DHT22 work with the Arduino Nano at 5 V?

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

Full Arduino Nano pinout · DHT22 (AM2302) temperature + humidity: all pins and data

The DHT22 on other boards

ESP32 DevKit Arduino Mega 2560 R3 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 Raspberry Pi Pico Teensy 4.1

Other parts on the Arduino Nano

BME280 BMP280 DHT11 HC-SR04 SSD1306 OLED MPU6050 DS18B20 WS2812B LED strip SG90 servo Relay module HC-SR501 PIR LCD 1602 I2C INA219 VL53L0X BH1750 MAX30102 RC522 RFID NEO-6M GPS Capacitive soil moisture sensor ADS1115 TM1637 28BYJ-48 stepper L298N Potentiometer Push button LED Joystick module SD card module AHT20