HC-SR04 with Arduino Nano

Wiring for the HC-SR04 ultrasonic distance 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)

void setup() {
  Serial.begin(115200);
  pinMode(2, OUTPUT);  // TRIG on D2
  pinMode(3, INPUT);   // ECHO on D3
}

void loop() {
  digitalWrite(2, LOW);  delayMicroseconds(2);
  digitalWrite(2, HIGH); delayMicroseconds(10);
  digitalWrite(2, LOW);
  long us = pulseIn(3, HIGH, 30000);
  Serial.println(us / 58.0);  // distance in cm
  delay(200);
}

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 HC-SR04?

VCC → 5V, TRIG → D2 (PD2), ECHO → D3 (PD3), GND → GND.

Does the HC-SR04 work with the Arduino Nano at 5 V?

Yes: the HC-SR04 runs at 5 V and the Arduino Nano uses 5 V signals, so no level shifting is needed.

Full Arduino Nano pinout · HC-SR04 ultrasonic distance: all pins and data

The HC-SR04 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

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