SIM800C development board quad-band GSM / GPRS module support Bluetooth / TTS

Description of product


         LC SIM800C is a quad-band GSM / GPRS module, its performance very stable, with small appearance and high cost-performance, to meet the various needs of customers. The operating frequency of SIM800C is GSM / GPRS 850/900/1800 / 1900MHz, can be used worldwide, you can achieve low power consumption of voice, SMS and data transmission, can be applied to a variety of design requirements of compact product.
Introduced the hardware and instructions
  • Input voltage range 5V-18V DC;
  • Self-propelled SIM card slot design, support 2G / 3G / 4G card or small card;
  • Module will connected to the network automatically after you power on it;
  • Compatible with a variety of single-chip serial port;
  • Reserved headset and microphone interface;
  • Support TTS \ DTMF function;
  • Bluetooth 3.0 protocol, enhanced Bluetooth antenna, support for serial port SPP and audio services;
  • Reserved lithium battery-powered BAT interface, you can use 3.7V lithium battery or 18650 lithium battery;
  • Reserved IPEX interface, SMA interface, spring antenna interface, can be used on different occasions;
  • With work indicator: the LED will flash 1 time per second when no network, no SIM card or SIM card inserted, and will flash 1 time per 3 seconds under normal conditions.
Introduced the hardware and instructions
  • Board size: 40.9*51.3mm
Functions of the board:

Interface description:
GND: Power ground
VCC_IN: Power supply pin, input DC5V-20V
RI: Ring indicator
DTR: Data terminal preparation
TXD: TTL serial port transmission
RXD: TTL serial port receive  
U2_R: module serial port 2 receive
U2_T: module serial port 2 send transmission
V_M: connect to the core voltage (5V/3.3V,it depend on your MCU) of MCU for level match(generally, NC also be OK for this pin)
ADC: ADC detection
SPP: Audio output positive
SPN: Audio output negative
MC-: Audio input negative
MC +: Audio input positive
PWR: Power enable or disable(enable when low level)
BAT: lithium battery input pin, 3.3v-4.4v
Basically instructions
The SIM800C mainly controlled by AT commands, so just find a USB convert to TTL serial port module,and 5V,GND,TXD,RXD pins connect to VCC_IN, GND,RXD, TXD pins of SIM800C When the module is started, the indicator LED flashes once every 1 seconds, and after a period of time, the indicator LED flashes once every 3 seconds, it means the SIM800C start works normally.