DHT11 with Arduino Mega 2560 R3

Wiring for the DHT11 temperature + humidity on the Arduino Mega 2560 R3 (ATmega2560, 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

DHT11 pin	Role	Arduino Mega 2560 R3 pin	Notes
VCC	Power	5V
DATA	One-wire data	22 (PA0)	Needs a 10 kΩ pull-up (already on 3-pin modules; 3-pin module order varies, read the labels)
NC	Not wired to the board	not connected	Not connected
GND	Ground	GND

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(22, DHT11);

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

void loop() {
  delay(2000);
  Serial.print(dht.readTemperature());
  Serial.print(" C  ");
  Serial.print(dht.readHumidity());
  Serial.println(" %");
}

Arduino board: arduino:avr:mega.

Questions

Which Arduino Mega 2560 R3 pins do I use for the DHT11?

VCC → 5V, DATA → 22 (PA0), GND → GND.

Does the DHT11 work with the Arduino Mega 2560 R3 at 5 V?

Yes: the DHT11 runs at 3.3-5 V and the Arduino Mega 2560 R3 uses 5 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 Arduino Mega 2560 R3 pinout · DHT11 temperature + humidity: all pins and data

The DHT11 on other boards

ESP32 DevKit 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 Raspberry Pi Pico Teensy 4.1

Other parts on the Arduino Mega 2560 R3

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