The power supply requirements of this module: 5V power supply, the USB power supply of the computer in the initial stage of computer debuggingcan meet the requirements. Because we added a large capacitance of 1000UF. The power consumption for long-time data transmission is recommended to be DC above 1A, and the TTL level serial port is adaptively compatible with 3.3V and 5V microcontrollers.

A good module not only has stable performance, but also has a very beautiful appearance. Modules with poor performance are messy regardless of their layout and wiring. When such a module is in front of you, please be careful. Buying modules is more useful than things, good after-sales and complete information, I believe our evaluation has proved that, thank you for your support. 1. SIM900A module introduction The power supply requirements of this module: 5V power supply, the USB power supply of the computer in the initial stage of computer debuggingcan meet the requirements. Because we added a large capacitance of 1000UF. The power consumption for long-time data transmission is recommended to be DC above 1A, and the TTL level serial port is adaptively compatible with 3.3V and 5V microcontrollers. Can be directly connected to the microcontroller. Standby is about 80MA, you can set the sleep state to about 10MA low power consumption. Computer debugging USB-232 and USB-TTL are available, depending on each person’s accessories. Support SMS, data, MMS, Internet access, etc. The reset pin header leads to unattended remote reset on site, with DTMF function for remote control. The biggest advantage of the module is that it retains 232 ports. It can monitor the execution of 51 low-end microcontrollers and module instructions during learning or development, which can find out the reason faster and save development and learning time. [Supports 2, 3, 4G mobile phone cards ] . This is the default. A DC power supply of 3.5-4.5V1.5A or above for the SIM900A module is also sold, which is suitable for 3.7V lithium battery power supply. Need to contact customer service. This module’s TTL level is compatible with 3.3V system, 5VTTL system needs to pass 232 control module.