Details

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BUY SIM800C https://www.utsource.net/itm/p/6498115.html
GSM/GPRS Module 3.4 to 4.4V 42-Pin SMD (Alt: SIM800C-TE)

Parameter	Description
Module Name	SIM800C
Operating Voltage	3.4V to 4.4V (Typical 4.0V)
Current Consumption	< 1mA (Idle Mode), < 2mA (Sleep Mode), ~40mA (Transmitting at max power)
Frequency Band	GSM850 / EGSM900 / DCS1800 / PCS1900
Interface	UART, I2C, SPI
Dimensions	22.4mm x 17.6mm x 2.4mm
Weight	3g
Antenna Connector	u.FL/IPEX
Temperature Range	-40°C to +85°C
Humidity Range	5% to 95% RH (non-condensing)

Instructions for Use:

1. Power Supply Setup:

   • Connect the module to a power source that provides between 3.4V and 4.4V.
   • Ensure stable power supply as voltage fluctuations can lead to unstable operation.

2. UART Configuration:

   • Default settings are 115200 bps, 8 data bits, 1 stop bit, no parity.
   • Adjust baud rate if necessary using AT commands.

3. Initialization:

   • Send AT command to check if the module is ready.
   • Configure network settings using appropriate AT commands like AT+CGDCONT.

4. Network Registration:

   • Use AT+CREG? to check network registration status.
   • Wait until the module registers with the network before proceeding.

5. Data Transmission:

   • For SMS, use AT+CMGF=1 to set text mode and AT+CMGS to send messages.
   • For GPRS/Internet connection, establish PDP context with AT+CGATT and AT+CSTT.

6. Power Saving:

   • Use AT+CSCLK=1 to enable sleep mode when not transmitting to save power.

7. Firmware Update:

   • Follow manufacturer guidelines for updating firmware through the UART interface.

8. Safety Precautions:

   • Avoid exposing the module to extreme temperatures or humidity.
   • Handle with care to prevent damage from static electricity.

(For reference only)