Beyond just making the module work, a few extra considerations can improve your simulation's reliability and accuracy.

void loop() // Your application logic here

Double-check your TX/RX wire crossings. The TX of the sender must always connect to the RX of the receiver.

: Supports standard commands like AT+CMGF=1 to set text mode and AT+CMGS for sending SMS.

Prevent burning real modules due to incorrect voltage inputs.

Right-click your Proteus icon and select .

Key specifications include:

Connect to a stable 5V source in simulation (Note: Physical modules require 4V, but Proteus models often simulate logic levels at 5V). →right arrow System Ground. Integrating the Virtual Terminal To view live AT commands during the simulation:

: Users can interact directly with the module using the Virtual Terminal in Proteus to send real-time AT commands. How to Install the Library in Proteus

Even in simulation, ensure you have a VCC and GND connection. UART Pins: Connect TXD of SIM800L to the RX of your MCU. Connect RXD of SIM800L to the TX of your MCU.

The most widely used simulation models for GSM modules in Proteus are provided by The Engineering Projects GSM Library for Proteus: This package usually includes the module, which is functionally almost identical to the Go to product viewer dialog for this item. for basic UART (AT command) simulations SIM800L Specific Models:

void loop() if (gsm.available()) Serial.write(gsm.read()); // Forward GSM response to Serial Monitor

Which you are pairing with the SIM800L (e.g., Arduino Uno, PIC, ESP32)?