Mô Đun Truyền Tín Hiệu Sim900A Gsm/Sms/Gsm/Gprs/Stm32/Không Dây tại Lotte Market

Giới thiệu Mô Đun Truyền Tín Hiệu Sim900A Gsm/Sms/Gsm/Gprs/Stm32/Không Dây tại Lotte Market

Introduction to SIM900A module

        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.
 
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.

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#SIM900 #GSM #Module #SIM900A #Development #STM32 #GPRS