SIM800L GSM / GPRS Mini Module
by SIMCom clone
SKU: PSA-CMP-SIM800L
No reviews yetTypical India street price
₹250–₹450
Sends SMS / GPRS from a 2G SIM — still useful in many Indian towns.
Interface: UART AT commands
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Concept
Cellular modem you drive with AT commands over serial.
A little theory
2G GSM. Peak TX current 2 A — a thin USB cable will brown it out. In the classroom, treat SIM800L GSM / GPRS Mini Module as a advanced part using UART AT commands. Typical India street price is about ₹250–₹450. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
Li-ion 3.7 V + fat capacitor. AT+CMGS for SMS. Antenna must be attached.
Classroom & project use
- SMS alerts
- Remote pump
- Attendance SMS
Buying in India
Precautions
- Dedicated 2 A supply
- Never power from Arduino 5 V pin
- Use IMEI-legal devices
Specifications
| Network | 2G GSM |
| Peak | ~2 A TX |
| Category | Communication Modules |
| Difficulty | Advanced |
| Voltage | 3.7–4.2V (high current) |
| Interface | UART AT commands |
Pinout
VCC | GND | TX | RX (cross TX↔RX; common GND)
