28BYJ-48 stepper with Nordic nRF52840 DK

Wiring for the 28BYJ-48 stepper + ULN2003 driver 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

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 28BYJ-48 stepper?

IN1 → P1.03, IN2 → P1.04, IN3 → P1.05, IN4 → P1.06, - → GND, + → 5V.

Does the 28BYJ-48 stepper work with the Nordic nRF52840 DK at 3.3 V?

Yes: the 28BYJ-48 stepper runs at 5 V and the Nordic nRF52840 DK uses 3.3 V signals, so no level shifting is needed.

Full Nordic nRF52840 DK pinout · 28BYJ-48 stepper + ULN2003 driver: all pins and data

The 28BYJ-48 stepper 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 Relay module HC-SR501 PIR LCD 1602 I2C INA219 VL53L0X BH1750 MAX30102 RC522 RFID NEO-6M GPS Capacitive soil moisture sensor ADS1115 TM1637 L298N Potentiometer Push button LED Joystick module SD card module AHT20