SIM800A module \ SMS \ boards \ GSM \ GPRS \ STM32 \ super SIM900A \ A6

UNV-SIM800A-V3.9.2 Introduction Development Board

• Power Requirements: 5V-18VPower supply, the current required 1.5A or more;

• TTL level serial port is compatible with 3.3V and 5V microcontrollers. May communicate directly with the real 51 / STM32 / MP430 SCM like;

• When debugging a computer with initial use CP2102 USB-TTL module to the power module and the communication;

• When using the MCU control module, and also through USB - 232 monitoring module for the return instruction data easy to find a great problem, especially for a small microcontroller with 51 partners.

• Standby around 30MA, you may be disposed about the sleep state 10MA low power consumption.

• Support SMS, GPRS data transmission, multimedia transmission, DTMF, HTTP, FTP, PPP dial functions.

• At the same time containing all the way to the hardware reset pin. When the module there is a problem, use this pin is reset to resolve.

• Development board supports 2G / 3G / 4G or mobile Unicom phone card.

This module advantages:

• Serial circuit: using magnetic beads and TVS protection device to protect the board so that the board will not hurt the surge, high voltage.

• SIM card circuit: increase SMF05C chip electrostatic discharge.

• Antenna circuit: guaranteed short and straight, so as to ensure that the signal strength.

• PCB show: silk mark each interface, convenient secondary development, full compliance SIM900A hardware design manual design.

• All the way 5-18V power supply Interface: We did a protection, even reversed, it will not burn board.

• All the way to TTL interface: Supports 3.3V and 5V single-chip microcontroller. That kind of support 51 5V microcontroller and STM32 microcontroller.

• Two antenna interface: SMA antenna interface, IPX MINI antenna interface (default not welded).

• 232 all the way to level interface: You can module that is connected to the computer through a raised 232 --- USB serial cable directly. It can also be USB - TTL connected to the computer, based on individual parts circumstances. Do not need to spend money on accessories this is the other sellers and is the biggest difference.

Computer-controlled power supply module and pictures modular approach:

In a word, the control module through the serial port to send commands (AT commands). Here are two ways to control the common module SIM800A:

The first: to TTL module through the USB, a schematic diagram of the computer module debug SIM800A: