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.
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
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