ESP32 and SIM800C Design
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Module1
U1
U2
U3
Below is a summary of the wiring connections to integrate the added components into your schematic:
Table
| Connection Net | From Component and Pin | To Component and Pin | Description |
|---|---|---|---|
| Battery Positive Path | [Li‑ion Battery (BAT1)] positive terminal | TP4056 (U4) BAT/IN pin (battery input) | Connect the battery positive to the TP4056 input. |
| TP4056 to Buck Input | TP4056 (U4) VCC/OUT pin (charger output) | Buck Converter (U5) IN pin | Wire the TP4056 output to the buck converter input. |
| 3.3 V Supply Net | Buck Converter (U5) OUT pin (3.3 V regulated output) | ESP32-WROOM-32D (U1) VCC, SIM800C (U3) VCC (and CH340C if present) | Distribute the regulated 3.3 V from the buck converter to the 3.3 V rails of the powered components. |
| UART (SIM800C to ESP32) | SIM800C (U3) TX pin | ESP32-WROOM-32D (U1) IO16 (RX) | Connect SIM800C transmitter to ESP32 receiver (UART default). |
| SIM800C (U3) RX pin | ESP32-WROOM-32D (U1) IO17 (TX) | Connect SIM800C receiver to ESP32 transmitter (UART default). | |
| Common Ground | Negative terminals of [Li‑ion Battery (BAT1)], TP4056 (U4), Buck Converter (U5), ESP32 (U1), SIM800C (U3) | Ground pin | Tie all grounds together for a unified return path. |
You can use the “Apply changes” option to add these wiring connections to your schematic. This will fully connect the power path and UART interface between the ESP32 and SIM800C modules while ensuring proper battery charging and voltage regulation.
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U1 GND - U3 GND
U1 GND - U3 GND
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