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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.<br />
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== Summary ==<br />
The SIM800C GSM/GPRS HAT is a 2G communication module that plugs onto a Raspberry Pi (2B/3B/3B+/Zero/Zero W) via the 40-pin header. It supports SMS, GPRS, DTMF, HTTP, FTP, MMS and email, plus Bluetooth 3.0. Control is via AT commands; the serial interface uses automatic baud-rate detection between 1200 and 115200 baud.<br />
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== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL16157 WSAL16157 – SIM800C GSM / GPRS / Bluetooth HAT for Raspberry Pi, 2G Communication]<br />
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== Technical overview ==<br />
* Compatibility: Raspberry Pi 2B, 3B, 3B+, Zero, Zero W.<br />
* Frequency bands: GSM 850 / EGSM 900 / DCS 1800 / PCS 1900 MHz with quad-band auto-search.<br />
* Power class: Class 4 (2 W at 850/900 MHz), Class 1 (1 W at 1800/1900 MHz).<br />
* GPRS: multi-slot class 12 by default, configurable to classes 1–12; data rates up to about 85.6 kbps.<br />
* Serial interfaces: two UARTs (RX1/TX1 and RX2/TX2); automatic baud-rate detection from 1200 to 115200 baud.<br />
* AT command set: 3GPP TS 27.007, 27.005 and SIMCOM extended AT commands.<br />
* Bluetooth 3.0 + EDR; supports SPP, OPP, HFP/HSP.<br />
* Two status LEDs: PWR (red = powered) and NET (blink patterns indicate network registration or transmission).<br />
* Power supply: 5 V; operating temperature −40 °C to 85 °C; dimensions 30.2 × 65 mm.<br />
* Jumpers: VCCIO selects 3.3 V or 5 V I/O voltage; PWR jumper connects to Raspberry Pi pin P4 by default.<br />
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'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
AT<br />
ATE1 / ATE0<br />
AT+CSQ<br />
AT+CGMR<br />
AT+CREG?<br />
AT+CGATT?<br />
AT+CIPMUX=0 / AT+CIPMUX=1<br />
AT+CSTT="CMNET"<br />
AT+CIICR<br />
AT+CIFSR<br />
AT+CIPSTART="TCP","<ip>",<port><br />
AT+CIPSTART="UDP","<ip>",<port><br />
AT+CIPSEND=<length><br />
AT+CIPCLOSE<br />
AT+CIPSHUT<br />
AT+CIPMODE=1<br />
AT+SAPBR=3,1,"Contype","GPRS"<br />
AT+SAPBR=3,1,"APN","CMNET"<br />
AT+SAPBR=1,1<br />
AT+SAPBR=2,1<br />
</syntaxhighlight><br />
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== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/SIM800C_GSM/GPRS_HAT SIM800C GSM/GPRS HAT - Waveshare Wiki]<br />
* Source revision: 87650<br />
* Captured: 2026-08-31T03:19:40+00:00<br />
* SHA-256: <code>0ae0872c52cdf03b40c9bc9f8a04b4a2afffa41773b3393a33c7203950fbab71</code></div>JWTechPublisher