SIM800L GSM/GPRS Module

Compact GSM/GPRS module based on SIMCom SIM800L chip. Features a built-in SIM card slot and antenna connector. Communicates via UART using AT commands. Operates at 3.4V–4.4V supply (must NOT be powered from 3.3V LDO; use a boost converter such as MT3608).

VCC
Supply voltage 3.4V–4.4V (typically ~4.0V from MT3608 boost converter). Peak 2A burst — use dedicated external supply with large decoupling capacitor (100–470uF).
Type · powerVoltage · 3.7
GND
Common ground shared with ESP32 and power supply.
Type · ground
TX
UART transmit pin (output from SIM800L to ESP32 RX). Logic level ~2.8V, compatible with ESP32 3.3V input threshold — no level shifting needed on this line.
Type · uart
RX
UART receive pin (input to SIM800L from ESP32 TX). Logic level ~2.8V. Drive via resistor voltage divider from ESP32 TX (3.3V → ~2.8V) to protect SIM800L input.
Type · uart
RST
Active-low hardware reset pin. Can be driven by ESP32 GPIO (3.3V logic).
Type · digital

Pin	Type	Function	Voltage
VCC	power	Supply voltage 3.4V–4.4V (typically ~4.0V from MT3608 boost converter). Peak 2A burst — use dedicated external supply with large decoupling capacitor (100–470uF).	3.7
GND	ground	Common ground shared with ESP32 and power supply.
TX	uart	UART transmit pin (output from SIM800L to ESP32 RX). Logic level ~2.8V, compatible with ESP32 3.3V input threshold — no level shifting needed on this line.
RX	uart	UART receive pin (input to SIM800L from ESP32 TX). Logic level ~2.8V. Drive via resistor voltage divider from ESP32 TX (3.3V → ~2.8V) to protect SIM800L input.
RST	digital	Active-low hardware reset pin. Can be driven by ESP32 GPIO (3.3V logic).

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