| Device | Pin on Device | GPIO | Header | Remarks |
|---|---|---|---|---|
| Servo Motor 1 | PWM | 12 | H5 | |
| Servo Motor 2 | PWM | 13 | H6 | |
| Servo Motor 3 | PWM | 4 | H7 | |
| Servo Motor 4 | PWM | 3 | H8 | |
| DFPlayer Mini MP3 Player | RX | 18 | H11 | IO18 is TX of ESP32C3 Connect pins 1 and 3 of H11 |
| DFPlayer Mini MP3 Player | TX | 19 | H11 | IO19 is RX of ESP32C3 Connect pins 2 and 4 of H11 |
| DFPlayer Mini MP3 Player | BUSY | 8 | ||
| MPR121 | IRQ | 7 | H1 | |
| MPR121 | SCL | 10 | H1 | |
| MPR121 | SDA | 6 | H1 | |
| WS2812 | DIN | 5 | H4 |