SIM900A GSM/GPRS Module V4.0

•  Compatible with Raspberry Pi and Arduino 
• 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 a 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. CityTechBD 

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 4 pieces 
• SIM900A serial port output terminal 
• Size: 49mm x 47mm 
• Net Weight: 28g
• Weight: 38g   CityTechBD 

Package Includes:

• 1 x SIM900A V4.0 kit 
• 1x Power Cable 
• 1x Antenna   CityTechBD