BoardPilotULN2003 driver board (4 channels) with ESP32
Supply 5-12 V
Bus GPIO
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| IN1 | Input (the ESP32 drives it) | D25 | |
| IN2 | Input (the ESP32 drives it) | D26 | |
| IN3 | Input (the ESP32 drives it) | D27 | |
| IN4 | Input (the ESP32 drives it) | D32 | |
| - | Ground | GND | Share it with the ESP32 GND |
| + | Not wired to the ESP32 | — | Load supply 5 to 12 V. For a 28BYJ-48 5 V: VIN is fine |
| OUT1 | Not wired to the ESP32 | — | Low-side switch to the load. White motor connector |
| OUT2 | Not wired to the ESP32 | — | |
| OUT3 | Not wired to the ESP32 | — | |
| OUT4 | Not wired to the ESP32 | — |
Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.
Sources
- Texas Instruments ULN2003A datasheet, Darlington array, 500 mA per channel, inputs compatible with 3.3 V logic
Try it in 3D in BoardPilot
Related parts
18650 Li-ion cell in holder28BYJ-48 stepper + ULN2003 driver433 MHz transmitter (FS1000A)74HC595 shift registerA4988 stepper driverActive buzzer
Part data: CC BY 4.0, free to reuse with credit to BoardPilot.