Overview:
The SIM800L is a compact GSM/GPRS module for Arduino, ESP32, STM32, and other microcontrollers. It enables your electronics projects to send/receive SMS, make/receive voice calls, and connect to the Internet via GPRS. Perfect for IoT projects, STEM labs, and maker experiments.
Key Features
Quad-band GSM: 850 / 900 / 1800 / 1900 MHz (works worldwide)
Supports SMS, voice calls, and GPRS data transmission
UART interface with AT command support
Small form factor: 24 × 24 × 3 mm
Compatible with Arduino, ESP32, STM32, and other MCUs
Onboard or SMA antenna (depending on module version)
Status LEDs for power and network connection
Technical Specifications
Electrical
| Parameter | Specification |
|---|---|
| Operating Voltage | 3.7 – 4.2 V |
| Idle Current | ~20 mA |
| Transmit Current | ~100 mA |
| Peak Current | Up to 2 A |
| Sleep Mode Current | <1 mA |
| Logic Level | 2.8–3.3 V UART |
GSM/GPRS
| Parameter | Specification |
|---|---|
| Frequency Bands | GSM 850 / 900 / 1800 / 1900 MHz |
| GPRS | Class 12, TCP/IP stack |
| SMS | Text and PDU modes |
| Voice Calls | Full-duplex, hands-free capable |
| Signal Strength | AT+CSQ (0–31) |
| Network Registration | AT+CREG, AT+CGREG |
Hardware
| Feature | Description |
|---|---|
| Dimensions | 24 × 24 × 3 mm |
| Audio Interface | Mic & speaker input/output |
| SIM Card | Mini/Micro SIM |
| Reset Pin | Optional digital reset |
| Recommended Capacitor | 1000 µF for power stability |
Applications
SMS-based alert systems and notifications
Remote device control via SMS commands
IoT data transmission using GPRS
Automated calling systems for alarms or monitoring
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