HW-353A SIM900A Module Development Board GSM GPRS

SIM900A GSM Module is the smallest and cheapest module for GPRS/GSM communication. It is common with Arduino and microcontroller in most of embedded application. The module offers GPRS/GSM technology for communication with the uses of a mobile sim. It uses a 900 and 1800MHz frequency band and allows users to receive/send mobile calls and SMS. The keypad and display interface allows the developers to make the customize application with it. Furthermore, it also has modes, command mode and data mode. In every country the GPRS/GSM and different protocols/frequencies to operate. Command mode helps the developers to change the default setting according to their requirements. Featured By RoboticsBD.

The SIM900A is designed with power saving technique so that the current consumption is as low as 1.5mA in SLEEP mode.  

Product Images are shown for illustrative purposes only and may differ from the actual product.

Note: Product images/ Components brand may vary from actual product as our stock rotates.

Features:

1. 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.
2. The onboard SMA (default) and IPXmini antenna interface, SIM900A interface reserved reset.
3. The size of the module is 49*50, all the new and original device.
4. 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. 
5. Standby dozens of MA data can be set to provide dormancy, dormancy of 10MA low power. Support 2, mobile phone 3,4G card.
6. The serial port circuit: support for 3.3V single chip microcomputer.
7. TTL serial port support 3.3 and 5V single chip microcomputer.
8. The SIM card circuit to increase the SMF05C ESD chip.Featured By RoboticsBD.
9. Antenna circuit: guarantee short and straight, so as to ensure the signal strength.
10. PCB display screen printing mark: each interface, convenient development two times, the SIM900/A hardware is completely follow the design when the design manual.
11. 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.
12. Control pin all leads.Featured By RoboticsBD.
13. A TTL level, compatible with 3.3V and 5V.
14. The two antenna interface, the default SMA straight head, connector for IPXmini antenna.
15. One way of speech interface, the way Mike interface

Pin Description

1. GND - GND
2. SIMR SIM900A RXD, TTL level, can not be directly connected to the 232 level
3. SIMT SIM900A TXD, TTL level, can not be directly connected to the 232 level
4. RST - SIM900A reset, active low
5. 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.
6. VCC5-DC 5V input.
7. VCC4-DC3.5-4.5 input

Note: You need expert soldering job to solder pin header. Use Heat Resistant Tape to cover the sim900A module before soldering. 

Featured By RoboticsBD.

Please allow 5% measuring deviation due to manual measurement.

Documentation:

1. Hardware Design Sim900A Datasheet
2. SIM900A GSM Module
3. SIM900A GSM Module
4. Home Automation System Using GSM SIM900A
5. GSM Sim900A with Arduino Complete Guide with GSM based Projects Examples
6. Tutorial to Interface GSM SIM900A With Arduino

Your network provider may not support setting the time automatically. In that case you can do it manually using AT+CCLK AT command.

And make sure your circuit and Arduino share a common ground.

You must be very careful not to disconnect GND before VCC and always connect GND before VCC. Otherwise the module may use the low voltage serial pins as ground causing damage to the module.

DC-DC Buck Converter

Power supply You cannot power the module from the Arduino, as it is incapable of supplying the necessary peak currents. The Sim900 draws about 2A every so often. It's not necessary to build a 2A supply, as a large storage capacitor on the power supply output will supply the current. I am using a small switch mode buck power supply to step down from an external 12V DC source to 3.3V, with a 0.1F 5V super capacitor on its output and that works a treat. I believe that a 1000uF low esr cap will also work, but I've not tried it. The photo shows the power supply with a 0.1F cap underneath. RoboticsBD

Any 2A-rated DC-DC buck converter like the LM2596 will work. These are much more efficient than linear voltage regulators such as the LM317 or LM338.

Featured By RoboticsBD.

Package Includes:

1 x HW-353A SIM900A Module Development Board GSM GPRS

1 x Module Power Cable

1 x Screw