SIM900A BOARD 1800/1900 MHZ GSM GPRS MODULE

This SIM900 GSM / GPRS Module is useful for using a cell phone network to talk to your microcontrollers wirelessly. Just wire it up to your microcontroller and you’ll have quad-band GSM network access anywhere in the world! Pop in a GSM sim card to send/receive calls and messages from your projects like you would with a cell phone. There are three protocols you can use to send messages: Short Message Service, Audio, or GPRS Service.

SIM900A BOARD Features:

• 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

SIM900A GSM GPRS MODULE Specifications:

• • Supports standard size GSM sim cards
  • Chipset: SIM900A
  • Quad-Band 850 / 900/ 1800 / 1900 MHz (works on GSM networks in any country)
  • The module is configured and controlled using simple AT commands via the onboard UART:
    • Standard Commands: GSM 07.07 & 07.05
    • Enhanced Commands: SIMCOM AT Commands
  • Has Short Message Service – so that you can send small amounts of data over the network (ASCII or raw hexadecimal).
  • Embedded TCP/UDP stack – allows you to upload data to a web server.
  • Physical Features:
    • External GSM Antenna with SMA connector
    • SIM Card holder (Flip Style)
    • Call Indicator LED
    • Onboard Serial RS232 interface foreasy debugging (3 pins on the left, see diagram for how to wire to an RS232 connector)
    • Onboard reset and restart solder points
    • Additional antenna can be added with IPX mini connector
    • Yellow Logic Level Select Pins: select between 5V and 3.3V interface (yellow pins)
    • Power Wires (red and black)

• • SIM900A Serial Port Output Terminal
  • Power Voltage (to be attached across the red and black wires): 5V DC (1A or higher is recommended)
  • Arduino & Raspberry Pi Compatible
  • Built in surge protection & SMF05C chip onboard for electrostatic protection
  • Dimensions: 50 x 50 mm

Package Includes:

• 1 x SIM900A kit
• 1x Power Cable
• 1x Antenna