Use cp 2102 usb-ttl module to supply and communicate modules

Unv-sim800a-v3.9.2 development board
Electricity supply requirements: 5v-18v power supply, 1.5a or more required for current
Ttl level serial port compatible 3.3 v and 5v single chip machine. Real communication with 51/stm 32/mp430
When debugging with a computer at the beginning, use cp 2102 usb-ttl module to supply and communicate modules
Control module using single chip microcomputer, you can also return data to the instruction via usb-232 monitoring module, it 's very easy to find the problem, especially suitable for 51 single chip microcomputer partner.
Standby is around 30 ma, you can set a dormant state at around 10 ma low power consumption.
Support for text messages、 gprs data transmission, send colorful letters, dtmf、 http、 ftp、 ppp dial-up functions.
At the same time, hardware contains one-way reset tube foot. When the module is in trouble, this tube foot can be reset to solve.
Development board supports 2g/3g/4g connection or mobile phone card.
Advantages of this module:
Serial circuit: Use tvs and magnetic bead protection devices to protect plates, keep the board from flooding、 high voltage damage.
Sim card circuit: Increase smf 05 c electrostatic release chip.
Antenna circuit: Short and straight guarantees, this will guarantee the signal intensity.
Pcb display: Interface screens marked, facilitating secondary development, the design is in full compliance with sim 900 a hardware design manual.
5-18v power supply interface: We 've done protection, even if it turns out, it won 't burn boards.
Ttl interface: Support 3.3 v mcu and 5 v mcu. That is to support 51 class 5 v mcu and stm 32 single chip machine.
Two-way antenna interface: Sma antenna, ipx mini (Default non-welding)。
232 level interface: That means you can connect the module directly to the computer through a 232-gigan usb serial port. Usb-ttl, depending on the individual 's accessories. Don 't need to spend more on accessories. That' s the biggest difference with other sellers.
Control module method of single chip microcomputer:
Ttl serial port of single chip machine (51 p3.0 p3.1 for mcu) Connect to the corresponding ttl serial port, the module can be controlled by sending at instructions through serial program. T-connect module r for single chip machine, t-total gnd of r-connect module of single chip machine. 3.3v mcu is the same.