Connecting the SIM7600G to the Arduino Mega

Connecting the SIM7600G to the Arduino Mega

May 30, 2025

Bench notes on wiring the SIM7600G LTE modem to the Arduino Mega, with pinout, a complete C++ sketch, and a list of essential AT commands.

Why Use the SIM7600?

• 4G LTE Cat-4: up to 150 Mb/s downlink and 50 Mb/s uplink.
• Built-in GPS/GLONASS — tracking without an extra module.
• Rich interface: UART, USB 2.0, GPIOs, analog audio.
• 100% controlled by AT Commands. Easy to script.

Connector Pinout

Quick Wiring with the Arduino Mega

Test Sketch

/**
 * main.cpp – AT console for SIM7600G on the Arduino Mega 2560
 *
 * Wiring used:
 *   SIM7600 TXD  → Mega 19 (RX1)
 *   SIM7600 RXD  → Mega 18 (TX1)  (through a divider or level-shifter → 3 V3!)
 *   SIM7600 GND  → Mega GND
 *   SIM7600 VCC  → 5 V / ≥2 A supply (do NOT take it from the Mega's USB 5 V)
 *
 * Open the Serial Monitor at 115 200 baud (Both NL & CR).
 * Everything you type goes to the modem and every response comes back to the screen.
 */

#include 

constexpr uint32_t USB_BAUD   = 115200;   // PC <--> Mega
constexpr uint32_t MODEM_BAUD = 115200;   // Mega <--> SIM7600

void setup()
{
    Serial.begin(USB_BAUD);
    while (!Serial) { /* wait for the monitor to open */ }

    Serial1.begin(MODEM_BAUD);            // UART-1: pins 19 (RX) / 18 (TX)

    Serial.println(F("
=== SIM7600G AT Console ==="));
    Serial.println(F("Type AT commands and press "));
    Serial.println(F("Example: AT+CSQ"));
    Serial.println();
}

void loop()
{
    // PC --> Modem
    while (Serial.available())
        Serial1.write(Serial.read());

    // Modem --> PC
    while (Serial1.available())
        Serial.write(Serial1.read());
}

/* Open the Serial Monitor at 115 200 baud. Type AT and get OK back. */

AT Commands to Get Started

References

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