SIM900A Kit

Model : GGG-00033

Supplier : Made in China

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SIM900A evaluation board.

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:
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
Package Includes:
  • 1 x SIM900A V3.8.2 kit
  • 1x Power Cable
  • 1x Antenna
  • Size:49mm x 47mm
  • Net Weight:28g
  • Weight: 38g 
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Suntop | Oct 9,2015 at 09:01 PM
He he he ! Very amusing Chi(E)nglish description !
Btalha2 | Nov 23,2015 at 09:21 AM
When it's going to be available again.
A.R | Nov 23,2015 at 09:33 AM
Within a week hopefully.
Btalha2 | Nov 23,2015 at 09:21 AM
When it's going to be available again.
RifatH | Jan 7,2016 at 02:48 PM
Can this be connected to Arduino UNO/Mega using normal cables from RX and TX? Or do I need something more
Rabbyctg | Jan 20,2016 at 02:11 PM
is it one kind of breakout board for sim900? will this board work independently?
A.R | Jan 20,2016 at 02:38 PM
Board is as it is shown in the pic. Please see the description well. whole package contents are mentioned.
Sadique14 | Jan 30,2016 at 12:03 AM
Can I connect it's rx, tx pin directly with microcontroller and use it. Please reply.
Sadique14 | Feb 11,2016 at 06:55 PM
এটাতে AA Battery Holder দিয়ে power দেয়ার জন্য কোন wire টা লাগবে?
A.R | Feb 11,2016 at 09:53 PM
Copper wire or male-male jumper must be soldered to the power pin.
Sadique14 | Feb 12,2016 at 09:42 PM
male-male jumper wire খুজে পাচ্ছি না। please, link দেন।
A.R | Feb 14,2016 at 09:52 AM
Sadique14 | Feb 20,2016 at 01:00 PM
Not available. Any way to use another wires?
Farzad | Feb 14,2016 at 06:12 PM
how can i connect TXD and RXD to microcontroller. Is there any way? I have to connect TXD to PD0 port of MC and RXD to PD1 port of MC
A.R | Feb 14,2016 at 08:25 PM
Those pins are all out here. You can easily connect them using jumpers.
Milon_Sarkar | Mar 4,2016 at 05:51 PM
Can you give me data sheet of this device.
Smbakhtiar | Mar 14,2016 at 05:52 PM
How do i connect Rx and Tx to my computer.
A.R | Mar 15,2016 at 01:40 AM
With USB to serial converter.
Smbakhtiar | Mar 15,2016 at 08:56 AM
Thanks for the reply. So i have to purchase 1. SIM900A V4.0 Kit
2.USB to serial converter 3. Power supply. which work as gsm modem.
A.R | Mar 15,2016 at 09:49 AM
Please see this vid for more idea. You'll find more in the youtube.
Smbakhtiar | Mar 15,2016 at 02:30 PM
Thanks for the tutorial.
But i am not use Arduino to connecte my pc , without Arduino uno is it possible to connect gsm module to my pc.
A.R | Mar 15,2016 at 02:34 PM
This question is also covered in the video a little bit. As we said earlier, you will need USB to serial converter.
Smbakhtiar | Mar 15,2016 at 05:53 PM
So if i buy SIM900A evaluation board then what step will follow to complete the gsm modem construction.
I think i need following, Please help me.
1. SIM900A evaluation board
2. usb to serial converter.
3. power supply

is any think else
or if you have any other product which cover my requirement please tell i will purchase it.

So what i need i have to connect gsm modem to my pc for simulation testing , than my MC.
Please help me
A.R | Mar 16,2016 at 10:25 AM
As far as we are concerned , to connect it with PC you will need USB to serial converter and USB cable, just like any other GSM module shown in our GSM tutorials. After adding a valid SIM, it must work fine. However, you are requested to see the video we gave earlier and visit the sites shown in that video to find out the proper pinout , power supply etc. For connecting it with microcontroller and arduino, you do not need any converter. Just make direct connection as shown in the video.
Smbakhtiar | Mar 16,2016 at 12:34 PM
Thanks for reply.
I congratulate you.

I want complete gsm modem. Where i can plug the cable play with at command just like other modem. Do you have this kind of product ready made. If so i will purchase it.
A.R | Mar 16,2016 at 12:37 PM
Oh. No. Sorry. We sell components actually. Not full furnished products.
Smbakhtiar | Mar 16,2016 at 12:48 PM
Thanks. If i buy SIM900 Development Board then my it will solved what i want. What i want is connect SIM900 Development Board to my pc using converter and PC will detected the device. Then i play it using AT command.
Please suggest me.
A.R | Mar 16,2016 at 01:05 PM
Yes. Possible.
Smbakhtiar | Mar 16,2016 at 01:53 PM
If i buy SIM900 Development Board . What additional component will need to buy.
A.R | Mar 16,2016 at 01:57 PM
Which product? This one or another?
Smbakhtiar | Mar 16,2016 at 02:20 PM
Not this one. this one SIM900 Development Board
A.R | Mar 16,2016 at 02:30 PM
If you are talking about this ( then please at first see all the documents in the documents section. For any further info contact Mr. Rezwanul Islam at [email protected]
.He made that board. We are just selling his device.
Skylarkk | Apr 9,2016 at 12:25 AM
jumper takontar sathe konta short a rakhte hoy ektu janale khub upokar hoy
FAHIM_REAZA | Apr 9,2016 at 05:37 PM
Please follow the description of this product.
Smbakhtiar | Apr 12,2016 at 09:31 AM
Dear Concern,

I purchase
SIM900A V4.0 Kit just 11/04/2016 .

but i am unable to connect it to my pc . where i am using usb to serial converter.

can you help me to find out that which pin is connected to which pin . Because i can not find any direction on description page.

Please help me.
FAHIM_REAZA | Apr 19,2016 at 12:33 PM
Our "Technical Team" has already contacted with you and we think your problem has been solved. Thanks for with us.
Smbakhtiar | Apr 19,2016 at 06:02 PM
Yes, He solved my problem. He performance is excellent.And also he is good person.I thanks to him also TECHSHOP.
Aminur99rahman | Jul 22,2016 at 06:50 PM
FAHIM_REAZA | Jul 23,2016 at 11:28 AM
Please follow the 6-pin yellow color male connector. The middle two pin RX and TX.
Swapnilsayansaha | Aug 24,2016 at 04:01 PM
You guys didn't provide the antenna. :/
FAHIM_REAZA | Aug 28,2016 at 09:12 AM
The package included with an antenna and also a power connecting cable.
Niloy369 | Dec 20,2016 at 10:44 PM
Can it be used with arduino to make http requests? If yes can you please tell me how?
A.R | Dec 21,2016 at 10:23 AM
Please see the AT command list of SIM900A.
Shamsulalam53 | Mar 9,2017 at 05:43 AM
I have purchased SIM900A module. I supplied 5V,2A power supply and inserted GP sim card. but the led is blinking fast. That means it is not getting the network. Could you please help me to solve this problem?
A.R | Mar 9,2017 at 10:25 AM
What is your order id?
Shamsulalam53 | Mar 10,2017 at 10:16 AM
Order Information #134675
A.R | Mar 11,2017 at 09:48 AM
Please send the product back with a copy of your invoice. We must check that first.
Asif3883 | Jun 1,2017 at 09:26 AM
Atate Audio output kora jabe ki vabe ?
A.R | Jun 1,2017 at 10:09 AM
Not possible.
Asif3883 | Jun 5,2017 at 12:23 AM
kit ta te 3.7 volt ar battery die power dibo ki vabe ?
A.R | Jun 7,2017 at 11:40 AM
You must solder male header with battery.
Nargisakhter | May 5,2018 at 03:15 PM
Does it support 3G or 4G
A.R | May 6,2018 at 11:00 AM
Sorry. This is not for video call. Only sms, phone related works.
Shovonmondol0055 | Sep 22,2018 at 05:12 PM
Is this have rx and tx socket?
A.R | Sep 23,2018 at 09:46 AM
Rx, Tx pinout given. Please see here:
Shovonmondol0055 | Sep 22,2018 at 07:59 PM
Can I give 3.3 volt in it?
A.R | Sep 23,2018 at 09:42 AM
Salahuddinsami | Aug 24,2020 at 05:03 PM
Power status light is not blinking. It keeps continuouslu glowing not blinking. Is it power supply issue or other problem..plz guide.
A.R | Aug 25,2020 at 10:53 AM
That is not a problem at all! POwer LED is supposed to glow and NETWORK LED is supposed to blink. KIndly see all the tutorials given in the 'documents' section.
Faizullah1190 | Jan 16,2021 at 07:12 PM
Which SIM card I am supposed to use. Grameen Phone does not work
FAHIM_REAZA | Jan 17,2021 at 03:35 PM
SIM900A Kit works fine with all registered networks in Bangladesh. Please check the device antenna connection and the network availability. If you are facing any further problems, please don’t hesitate to contact us (Customer Care: 09 678 110 110).

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