Sim900A Mini Wireless Data Transfer Module / SMS / Development Board / GSM / GPRS / STM32 Board Kit

1. Serial port circuit: TVS and magnetic bead protection devices are used to protect the board, so that the board will not be damaged by surges and high voltages. SIM card circuit: add SMF05C electrostatic discharge chip. Antenna circuit: Keep it short and straight, so as to ensure the signal strength.
2. PCB display: each interface is marked by silk screen, which is convenient for secondary development, and the design completely follows the SIM900A hardware design manual.
3. All the way 5V power supply interface: We have made protection, even if the connection is reversed, it will not burn the board. The computer USB power supply is sufficient for the initial debugging of the computer; long-term data transmission requires a large amount of electricity, and we recommend a DC above 1A.
4. One TTL interface: support 3.3V single-chip microcomputer and 5V single-chip microcomputer. In other words, it supports 51 types of 5V microcontrollers and STM32 microcontrollers.
5. Two antenna interfaces: SMA antenna interface, IPX MINI antenna interface (no welding). One 232 level interface: that means you can directly connect the module to the computer through a 232---USB serial line. It can also be connected to a computer via USB-TTL, depending on personal accessories.

Model: SIM900A
Power requirements: 5V
size:1 x 2cm
Material:abs
colour:Black+blue

Package Contents:
1 x sim900a module
1 x GSM module antenna
1 x Module power cord