SIM900A module, SMS, development board, GSM, GPRS, STM32, wireless data transmission
Advantages of this module:
Serial port circuit: TVS and magnetic bead protection devices are used to protect the board from surges and high voltage damage.
SIM card circuit: Add SMF05C electrostatic discharge chip.
Antenna circuit: Ensure short and straight to ensure signal strength.
PCB display: Each interface is screen printed for easy secondary development, and the design strictly follows the SIM900A hardware design manual.
All way 5V power supply interface: We have implemented protection, even if it is , it will not burn the board. The initial debugging of the computer requires USB power supply; Long term data transmission requires a large amount of electricity, and we recommend a DC voltage of 1A or higher.
One way TTL interface: supports 3.3V and 5V microcontrollers. That is to say, it supports Class 51 5V microcontrollers and STM32 microcontrollers.
Two antenna interfaces: SMA antenna interface and IPX MINI antenna interface (default not soldered).
One 232 level interface: That is to say, you can directly connect the module to the computer through a 232-- USB serial port cable. It is also possible to connect to a computer via USB TTL, depending on individual accessory requirements. There is no need to spend extra money on accessories, which is the biggest difference from other sellers.
