ITEM NAME:SIM900A Kit Wireless Development Module GSM GPRS STM32 Board with GPRS Antenna Product Description Description: Feature: 1. The onboard two set power supply interface VCC5 5V power supply, VCC4 interface, 3.5--4.5V power supply, optional power on self starting (default) and control start. 2. The onboard SMA (default) and IPXmini antenna interface, SIM900A interface reserved reset. 3. The size of the module is 49*50, all the new and original device. 4. The computer can give early computer debugging USB module power supply, a very large amount of data under the.VCC-MCU when the SIM900A module and 5V TTL level communication, this pin is connected to DC 5V; when the level of communication of SIM900A and 3.3V TTL, this pin is connected to DC 3.3V. The onboard SMA (default) and IPXmini antenna interface, SIM900A interface reserved reset.
