BoardPilotSIM800L GSM/GPRS module (2G) with ESP32
Supply 3.4-4.4 V
Bus GPIO
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| NET | Not wired to the ESP32 | — | Antenna connection |
| VCC | Power | 3V3 | 3.4 to 4.4 V with peaks up to 2 A. Use a Li-ion cell or a buck converter, not the ESP32 pins |
| RST | Input (the ESP32 drives it) | D25 | Reset, active LOW |
| RXD | Input (the ESP32 drives it) | D26 | UART: the module receives here (2.8 V logic). Connect to an ESP32 TX pin through a divider |
| TXD | Output (the part drives it) | D27 | UART: the part sends data here. Connect to an ESP32 RX pin. Auto-baud: try 9600 or 115200 |
| GND | Ground | GND | Connect to ESP32 GND too |
| RING | Output (the part drives it) | D32 | LOW on an incoming call or SMS, optional |
| DTR | Not wired to the ESP32 | — | Sleep control, optional |
| MIC+ | Not wired to the ESP32 | — | Microphone, optional |
| MIC- | Not wired to the ESP32 | — | |
| SPK+ | Not wired to the ESP32 | — | Speaker, optional |
| SPK- | 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
- SIMCom SIM800 series hardware design, Power supply 3.4 to 4.4 V, burst current up to 2 A; UART at 2.8 V levels
Try it in 3D in BoardPilot
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.