The SIM800L V2 Evaluation Board is a compact GSM/GPRS module designed for wireless communication. It supports functionalities such as SMS, voice calls, and data transmission over 2G networks. The evaluation board simplifies the integration of the SIM800L module into projects by providing a pre-configured schematic with essential components and connections.
This module is widely used in IoT applications, remote monitoring systems, home automation, and any project requiring cellular connectivity. Its small size, low power consumption, and versatile features make it a popular choice for developers and hobbyists.
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This circuit features an Arduino Nano interfaced with a SIM800L EVB GSM module for cellular communication, a GPS NEO 6M module for location tracking, and three TCRT 5000 IR sensors for object detection or line tracking. The Arduino facilitates data exchange between the GPS and GSM modules and processes signals from the IR sensors. The provided code skeleton suggests that the Arduino is programmed to perform tasks in a loop, but specific functionality is not detailed in the code.
This circuit integrates an ESP8266 NodeMCU microcontroller with a SIM800L GSM module, a GPS NEO 6M module, and a 16x2 I2C LCD display for communication and location tracking. It also includes a pushbutton for user input, a piezo buzzer for audio alerts, and is powered by a 2x 18650 battery pack through an LM2596 step-down module.
This circuit features an ESP32 microcontroller interfaced with a SIM 800L GSM module for cellular communication and a Neo 6M GPS module for location tracking. A voltage regulator is used to maintain a stable voltage supply from a polymer lithium-ion battery to the GSM, GPS, and ESP32 modules. Additionally, the circuit includes a pushbutton to trigger inputs and an LED with a current-limiting resistor, likely for status indication.
This circuit features an ESP32 Devkit V1 microcontroller interfaced with an RFM95 LoRa transceiver module for long-range communication and a SIM800L GSM module for cellular connectivity. Two LM2596 step-down modules are used to regulate the 12V battery voltage down to 3.3V required by the ESP32, RFM95, and SIM800L. The ESP32 facilitates data exchange between the RFM95 and SIM800L, enabling the system to send/receive data over both LoRa and GSM networks.
The SIM800L V2 Evaluation Board is built around the SIM800L GSM/GPRS module and includes additional components to ensure stable operation and easy interfacing. Below are the key technical details:
Key Features
Operating Voltage: 3.7V to 4.2V (recommended: 4.0V)
Current Consumption:
Idle: ~1mA
Active (GPRS): ~100mA to 250mA
Peak: ~2A (during transmission bursts)
Frequency Bands: Quad-band (850/900/1800/1900 MHz)
Communication Protocols: GSM, GPRS (Class 12)
Interface: UART (3.3V logic level)
SIM Card Support: Micro SIM
Antenna: External antenna via IPX connector
Operating Temperature: -40°C to +85°C
Pin Configuration and Descriptions
The SIM800L V2 Evaluation Board provides several pins for interfacing. Below is the pinout and description:
Pin Name
Type
Description
VCC
Power Input
Connect to a 3.7V-4.2V power source (e.g., LiPo battery).
GND
Ground
Connect to the ground of the power supply and circuit.
TXD
UART Output
Transmit data (connect to RX of the microcontroller).
RXD
UART Input
Receive data (connect to TX of the microcontroller).
RST
Input
Reset pin (active low). Pull low for at least 100ms to reset the module.
NET
Status Output
Network status indicator (blinks to indicate GSM/GPRS status).
ANT
Antenna Port
Connect an external antenna via the IPX connector for better signal reception.
Usage Instructions
How to Use the SIM800L V2 Evaluation Board in a Circuit
Power Supply:
Use a stable power source capable of providing 3.7V to 4.2V with at least 2A peak current. A LiPo battery is recommended for optimal performance.
Avoid powering the module directly from a 5V source, as it may damage the module.
Connections:
Connect the VCC and GND pins to the power supply.
Use the TXD and RXD pins to interface with a microcontroller (e.g., Arduino UNO). Ensure the logic level is 3.3V to avoid damaging the module.
Attach an external antenna to the ANT port for reliable network connectivity.
SIM Card:
Insert a micro SIM card into the slot on the evaluation board. Ensure the SIM card is activated and has sufficient balance for SMS, calls, or data usage.
UART Communication:
Configure the UART interface of your microcontroller to communicate with the SIM800L module. The default baud rate is 9600 bps.
Initialization:
After powering on, wait for the NET pin to blink slowly, indicating a successful network connection.
Example: Connecting to an Arduino UNO
Below is an example of how to use the SIM800L V2 Evaluation Board with an Arduino UNO to send an SMS:
Circuit Diagram
Connect VCC to a 3.7V-4.2V power source.
Connect GND to the Arduino's GND.
Connect TXD to Arduino pin 10 (RX).
Connect RXD to Arduino pin 11 (TX) via a voltage divider to step down the 5V signal to 3.3V.
Arduino Code
#include <SoftwareSerial.h>
// Define RX and TX pins for SoftwareSerial
SoftwareSerial sim800l(10, 11); // RX, TX
void setup() {
// Initialize serial communication with the SIM800L module
sim800l.begin(9600);
Serial.begin(9600);
// Wait for the module to initialize
Serial.println("Initializing SIM800L...");
delay(1000);
// Send an AT command to check communication
sim800l.println("AT");
delay(1000);
while (sim800l.available()) {
Serial.write(sim800l.read()); // Print response to Serial Monitor
}
// Send an SMS
sendSMS("+1234567890", "Hello from SIM800L!");
}
void loop() {
// Nothing to do here
}
void sendSMS(String phoneNumber, String message) {
sim800l.println("AT+CMGF=1"); // Set SMS mode to text
delay(1000);
sim800l.println("AT+CMGS=\"" + phoneNumber + "\""); // Set recipient
delay(1000);
sim800l.print(message); // Write the message
delay(1000);
sim800l.write(26); // Send Ctrl+Z to send the SMS
delay(5000);
Serial.println("SMS sent!");
}
Important Considerations
Ensure the power supply is stable and capable of handling the module's peak current requirements.
Use a level shifter or voltage divider when interfacing with 5V logic devices like the Arduino UNO.
Place the antenna in an open area for better signal reception.
Troubleshooting and FAQs
Common Issues and Solutions
Module Not Powering On:
Ensure the power supply provides 3.7V-4.2V with sufficient current (2A peak).
Check the connections to the VCC and GND pins.
No Network Connection:
Verify that the SIM card is properly inserted and activated.
Check the antenna connection and ensure good signal reception.
Confirm that the module supports the frequency bands of your local network.
No Response to AT Commands:
Ensure the UART connections (TXD and RXD) are correct.
Verify the baud rate is set to 9600 bps.
Check for voltage level mismatches between the module and the microcontroller.
Module Resets During Operation:
This is often caused by insufficient power. Use a capacitor (e.g., 1000µF) across the power supply to stabilize it.
FAQs
Can I power the module with 5V?
No, the module requires 3.7V-4.2V. Use a step-down regulator if your power source is 5V.
What is the default baud rate of the SIM800L module?
The default baud rate is 9600 bps.
How do I reset the module?
Pull the RST pin low for at least 100ms to reset the module.
Can I use the module for 3G or 4G networks?
No, the SIM800L only supports 2G networks (GSM/GPRS).
By following this documentation, you can effectively integrate the SIM800L V2 Evaluation Board into your projects for reliable GSM/GPRS communication.
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