BoardPilotRelay module 4 channels (5 V, optocoupler) with ESP32
Supply 5 V
Bus GPIO
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| GND | Ground | GND | |
| IN1 | Input (the ESP32 drives it) | D25 | LOW = relay on (typical) |
| IN2 | Input (the ESP32 drives it) | D26 | |
| IN3 | Input (the ESP32 drives it) | D27 | |
| IN4 | Input (the ESP32 drives it) | D32 | |
| VCC | Power | VIN | Needs 5 V: use VIN |
| JD-VCC | Not wired to the ESP32 | — | Separate coil supply. Keep the jumper to VCC unless you use an isolated supply |
Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.
This module is sold for 5 V. Its outputs may be 5 V: use a level shifter or a voltage divider on ESP32 inputs.
Sources
- Songle SRD-05VDC-SL-C datasheet, Coil 5 V, about 70 mA per channel
Try it in 3D in BoardPilot
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.