| Conductive Type: | Bipolar Integrated Circuit |
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| Integration: | SSI |
| Technics: | Semiconductor IC |
| MFG.: | SIMCOM |
| Quality: | Genuine New Original |
| Package: | module |
| Samples: |
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| Customization: |
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Audited Supplier SIM900A module : Mini V4.0 Wireless Data Transmission Module GSM GPRS Board Kit with Antenna
Package: module
Mfr. Part#: SIM900A module
Mfr.: Chinese made
Datasheet: 
(e-mail or chat us for PDF file)
ROHS Status:
Quality: 100% Original
Warranty: 180 days
Power supply requirements of this module: 5V power supply, computer USB power supply can meet the requirements at the beginning of computer debugging. Because we added a large capacitor of 1000UF. Long-term transmission of data power consumption is recommended for DC above 1A, TTL level serial port is compatible with 3.3V and 5V microcontrollers.
Provided program:
1 Send a Chinese text message
2 Send an English message
3 Dial the specified number and hang up automatically after 1 minute
4 Receive the specified SMS content, control the LED to break
5 Check if the module is registered to the network, read the SIM card, and send a prompt message.
6 Connect to the specified server and send the specified data via GPRS
7 Provide sleep data, power consumption is about 10MA.
8 provide modules using video tutorials and microcontroller download program video tutorial
To buy an electronic module, you must first look at the device layout and routing on the module. Good modules not only have stable performance, but also look very beautiful. Modules with poor performance are messy regardless of layout and routing. When such a module is placed in front of you, please be cautious. Buying a module is better than using things, after-sales and information, I believe that our evaluation has been proved, thank you for your support.
First, SIM900A module introduction
Power supply requirements of this module: 5V power supply, computer USB power supply can meet the requirements at the beginning of computer debugging. Because we added a large capacitor of 1000UF. Long-term transmission of data power consumption is recommended for DC above 1A, TTL level serial port is compatible with 3.3V and 5V microcontrollers. Can be directly connected to the microcontroller. Standby at around 80MA, you can set the sleep state to low power consumption around 10MA. Computer debugging USB--232 and USB--TTL are available, depending on each accessory. Support SMS, data, MMS, Internet and more. The reset pin header is used to realize the unattended remote reset in the field, and the remote control function is realized by the DTMF function. The biggest advantage of the module is that it retains 232 ports. It can monitor 51 low-end MCU and module command execution during learning or development, which can find out the reason faster and save development and learning time. [Support 2, 3, 4G mobile phone cards . This is the default.
Also sold SIM900A module 3.5--4.5V1.5A or more DC power supply, suitable for 3.7V lithium battery power supply. Need to contact customer service. The TTL level of this module is compatible with 3.3V system, and the 5VTTL system needs to pass the 232 control module.
The advantages of this module:
Serial port circuit: TVS and magnetic bead protection devices are used to protect the board, so that the board will not be damaged by surge and high voltage.
SIM card circuit: Add SMF05C electrostatic release chip.
Antenna circuit: guaranteed to be short and straight so as to ensure signal strength.
PCB display: Each interface is screen printed, which is convenient for secondary development. The design is completely in accordance with the SIM900A hardware design manual.
All the way 5V power supply interface: We have done protection, even if it is reversed, it will not burn the board. Initial computer debugging USB power supply can be used; long-term transmission of data consumption is large, we recommend DC above 1A.
One way TTL interface: support 3.3V microcontroller and 5V microcontroller. In other words, it supports 51V 5V and STM32.
Two antenna interfaces: SMA antenna interface, IPX MINI antenna interface (not soldered by default).
One way 232 level interface: that is to say you can connect the module directly to the computer through a 232---USB serial cable. It can also be connected to a USB--TTL computer, depending on the individual accessories. You don't need to spend more money to buy accessories. This is the biggest difference with other sellers.
The SIM900A module is described in detail:
Computer control module method:
In a word, the module is controlled by the serial command (AT command). The following are two common ways to control the SIM900A module:
The first one: through the CP2102 USB to TTL module, the store has sales, computer debugging SIM900A module schematic:
The second type: connect the module to the computer through the USB-232 serial cable, and then connect to the 5V power supply, and connect as shown below.
Here is more to say, the reason why our SIM900A module retains the 232 interface during design, the reason is: 51 low-end microcontroller can not achieve simulation, so you can not know the execution of each instruction sent by the microcontroller to the SIM900A module. However, this problem has been solved very well in our country. By connecting the module to the computer with the SIM900A module 232 interface, it is easy to monitor the execution of each instruction. It is particularly useful in actual development, many problems. It was found through this 232.
Default shipping list
Sim900a module*1
GSM module antenna *1
Module power cable*1,
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