BoardPilotRelay module with Nordic nRF52840 DK
Wiring for the Relay module 1 channel (5 V) on the Nordic nRF52840 DK (nRF52840-QIAA, 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
| Relay module pin | Role | Nordic nRF52840 DK pin | Notes |
|---|---|---|---|
| IN | Input to the part | P1.03 | Many modules switch on with IN LOW. Some do not react to 3.3 V: check with a test |
| GND | Ground | GND | |
| VCC | Power | 5V | Needs 5 V for the coil: use 5V |
| COM | Not wired to the board | not connected | Relay common contact. Mains voltage is dangerous |
| NO | Not wired to the board | not connected | Normally open contact |
| NC | Not wired to the board | not connected | Normally closed contact |
Check before you power it on
- Supply: 5 V from the 5V pin.
- Motors, servos, relays and LED strips can draw more current than the Nordic nRF52840 DK’s pins or USB can give. Power them separately and connect the grounds together.
Test code (Arduino)
The Arduino core for this board numbers its pins differently from the chip names, so no code is shown here. Use the pin names from your core’s variant file.
Arduino board: adafruit:nrf52:pca10056. Plug USB into the port on the short edge (interface MCU, J2) and set the power switch to ON; before the first Arduino sketch, burn the Adafruit bootloader and SoftDevice once.
Questions
Which Nordic nRF52840 DK pins do I use for the Relay module?
IN → P1.03, GND → GND, VCC → 5V.
Does the Relay module work with the Nordic nRF52840 DK at 3.3 V?
Yes: the Relay module runs at 5 V and the Nordic nRF52840 DK 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 BoardPilotFull Nordic nRF52840 DK pinout · Relay module 1 channel (5 V): all pins and data
The Relay module on other boards
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Other parts on the Nordic nRF52840 DK
BME280 BMP280 DHT22 DHT11 HC-SR04 SSD1306 OLED MPU6050 DS18B20 WS2812B LED strip SG90 servo 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