Product Description:

• SIM900A GSM GPRS Wireless Module
• Onboard two sets of power interface VCC5 5V power supply, VCC4 interface, 4.8-5.2V power supply, optional power supply self-start (default) and control start.
• Onboard SMA (default) and IPX mini antenna interface, SIM900A interface retains reset.
• The size of the module is 49 * 50mm, all new and original equipment.
• The computer can power the early computer debugging USB module, and there is a very large amount of data under the recommended current of more than 1A.
• You can set up dozens of MA data in standby to provide 10MA low power sleep and sleep.
• at Mekatroniks.com
  

  SIM900A Kit Wireless Extension Module GSM GPRS Board With Antenna.

• Specification:

• SIM900A GSM GPRS Wireless Module
• Serial port circuit: Support 3.3V microcontroller.
  TTL serial port: Supports 3.3V and 5V microcontrollers.
  SIM card circuit: Added SMF05C ESD chip.
  Antenna circuit: ensure short and straight, thus ensuring signal strength.
  PCB display printing mark: Each interface is easy to develop twice, and the SIM900 / A hardware is completely designed according to the design manual.
  Two power interfaces: VCC5, 1A above 5A DC. The computer 5V power supply can use the computer USB early. The DC long data circuit exceeds the recommended 5V1A. VCC4, 4.8-5.2V power supply, same as above, suitable for lithium batteries.
  The control interface described by each pin:
  GND – GND
  VCC_MCU When the SIM900A module communicates with a 5V TTL level, this pin is connected to DC 5V; when SIM900A and 3.3V TTL communication level, this pin is connected to DC 3.3V.
  VCC5 — DC 5V input.
  VCC4 — DC 4.8-5.2 input.
  Onboard Resources:
  Serial circuit (with protection)
  Antenna interface circuit (SMA curved female port)
  SIM card circuit (flip SIM slot)
  4 * 3.5 fixture holes
  SIM900A serial output terminal