Home > Arduino & SCM Supplies > SIM900A
SIM900A Wireless Module GSM GPRS Shield Board + Antenna for Arduino
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. The onboard SMA (default) and IPXmini antenna interface£¬ SIM900A interface reserved reset. The size of the module is 49*50£¬ all the new and original device. The computer can give early computer debugging 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 microcomputer. TTL serial port support 3.3 and 5V single chip microcomputer. The SIM card circuit to increase the SMF05C ESD chip. Antenna circuit: guarantee short and straight£¬ so as to ensure the signal strength. PCB display screen printing mark: each interface£¬ convenient development two times£¬ the SIM900/A hardware is completely follow the design when the design manual. Two power supply interface: VCC5£¬ 5V DC above 1A. Computer 5V power supply can be early computer USB. DC long data circuit over larger recommended 5V1A. VCC4£¬ 3.5--4.5V power supply£¬ ibid.£¬ suitable for lithium battery. Control pin all leads. A TTL level£¬ compatible with 3.3V and 5V. The two antenna interface£¬ the default SMA straight head£¬ connector for IPXmini antenna. One way of speech interface£¬ the way Mike interface. The control interface 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 interface circuit(SMA bend female port) SIM card circuit(flip SIM slot) 4*3.5 fixture hole 4pcs SIM900A serial port output terminal