2X Sim900A Wireless Data Transfer Module / SMS / Development Board / GSM / GPRS / STM32 Board Kit

2X Sim900A Wireless Data Transfer Module / SMS / Development Board / GSM / GPRS / STM32 Board Kit Description

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 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 antenna interface (no welding). One 232 level interface: that means you can directly connect the module to the computer through a 232---USB serial . It can also be connected to a computer via USB-TTL, depending personal accessories.

Model: SIM900A
Power requirements: 5V
size:48 x 50mm
Material:abs
colour:Black+

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

Only the above package content, other products are not included.
Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.