Bảng Mạch Mở Rộng Arduino Sim900a Gsm Gprs

SIM900A V4.0 Kit Extension Module GSM GPRS Board Antenna Tested Worldwide Store
Features:
The onboard two set power supply in VCC5 5V power supply, VCC4 in, 3.5--4.5V power supply, optional power on self starting (default) and control start.
The onboard SMA (default) and IPXmini antenna in, SIM900A in reserved reset.
The size of the module is 49*50, all the new and original device.
The compu can give early compu debing USB module power supply, a very large amount of data under the condition of the recommended current more than 1A. Standby dozens of MA data can be set to provide dormancy, dormancy of 10MA low power. Support 2, mobile phone 3,4G card.
The serial port circuit: support for 3.3V single chip microcompu. TTL serial port support
3.3 and 5V single chip microcompu.
The SIM card circuit to increase the SMF05C ESD chip.
Antenna circuit: guarantee short and straight, so as to ensure the signal sngth.
PCB display screen printing mark: each in, convenient development two times, the SIM900/A hardware is completely follow the design when the design manual.
Two power supply in: VCC5, 5V DC above 1A. Compu 5V power supply can be early compu USB. DC long data circuit over larger recommended 5V1A. VCC4, 3.5--4.5V power supply, ibid., suitable for lithium baty.
Control pin all leads.
A TTL level, compatible with 3.3V and 5V.
The two antenna in, the default SMA straight head, connector for IPXmini antenna.
One way of speech in, the way Mike in.
The control in of each pin description:
GND - GND
SIMR SIM900A RXD, TTL level, can not be directly connected to the 232 level
SIMT SIM900A TXD, TTL level, can not be directly connected to the 232 level
RST - SIM900A reset, active low
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.
VCC5----DC 5V input.
VCC4------DC3.5--4.5 input

Onboard Resources:
Serial port circuit(with protection)
Antenna in circuit(SMA bend female port)
SIM card circuit(flip SIM slot)
4*3.5 fixture hole 4pcs
SIM900A serial port output minal

Specifications:
Size:49mm x 47mm
Net Weight:28g
Weight: 38g

Package Included:
1 x SIM900A V4.0 kit
1x Power Cable
1x An