SIM800L GSM Module
2G GSM module for SMS alerts and basic mobile network projects.
AI Ready Overview
Quick Summary
SIM800L is a gsm module commonly used in FYP and embedded projects. It is best for sms alert systems and gps tracker alerts, with wiring and testing planned around Arduino, ESP32, STM32.
Difficulty
Advanced
Time Required
2-4 weeks for wiring, library setup, calibration, integration and reliable demo testing
Cost
RM12-RM30 module range in Malaysia; full project cost depends on scope.
Components
SIM800L, Arduino, ESP32, STM32
Overview
What is SIM800L?
SIM800L is a small GSM module used for SMS and call alerts. It is popular in older Arduino FYP projects, but it needs a strong power supply and depends on 2G network availability.
Engineering Reference
Quick Specs
| Network | 2G GSM/GPRS |
|---|---|
| Supply Voltage | Around 3.7V-4.2V |
| Peak Current | Can exceed 2A during transmit bursts |
| Interface | UART AT commands |
Real Usage Notes
Suitable / Not Suitable
Suitable for
- ✓ SMS alert systems
- ✓ GPS tracker alerts
- ✓ Panic button projects
- ✓ Remote basic telemetry
Not suitable for
- ✕ Areas without 2G service
- ✕ High-speed internet
- ✕ Low-power battery projects without careful power design
Build Planning
Difficulty
SIM800L is rated Advanced. Plan around 2-4 weeks for wiring, library setup, calibration, integration and reliable demo testingdepending on wiring, libraries, calibration, dashboard/app integration and testing evidence.
Build Planning
Time Required
2-4 weeks for wiring, library setup, calibration, integration and reliable demo testing
Malaysia Price Guidance
Cost
Typical module price range: RM12-RM30. This is component guidance only; a complete FYP cost depends on controller, sensors, casing, display, app/dashboard, documentation and timeline.
Connections
Pinout
VCC
Stable high-current supply input.
GND
Common ground with controller.
TXD
Module UART transmit.
RXD
Module UART receive.
RST
Reset input on some modules.
Platform Notes
Wiring Guides
SIM800L with Arduino
Use a separate regulated supply. Do not power SIM800L from Arduino 5V pin.
| SIM800L VCC | Dedicated 4V supply with high current capacity |
|---|---|
| SIM800L GND | Arduino GND and supply GND |
| SIM800L TXD | Arduino RX |
| SIM800L RXD | Arduino TX through level consideration |
Fix Common Problems
Troubleshooting
Troubleshooting
Common Mistakes
FYP Ideas Using SIM800L
Related Projects
Compare Options
Alternative Components
Student Questions
FAQ
Why does SIM800L keep restarting?
The most common reason is weak power. SIM800L needs a stable supply that can handle high transmit current bursts.
Is SIM800L still good for new projects?
Only if 2G coverage is available in the project area. For future-proof projects, consider a 4G module.