SIM900a module \ SMS \ development board \ GSM \ GPRS \ MMS \ wireless data transmission sending 51 program
Product Descriptions:
1、 Program provided (STC12/15/89, STM32 series):
Make a phone call;
Answer the phone;
Send Text format SMS;
Sending Chinese text messages;
Receive SMS and control LED lights;
GPRS-TCP program (dynamic IP);
GPRS-TCP program (domain name);
GPRS-UDP program (dynamic IP);
GPRS-UDP program (domain name);
GPRS transparent transmission mode program;
Comprehensive Function Demonstration Program (STM32);
Comprehensive Function Demonstration Program (STC12);
Comprehensive Function Demonstration Program (STC15);
The SIM900a module designed by our company comes with a set of 232 level interfaces, which can be directly connected to a computer or USB-TTL connected to a computer. Depending on the convenience of personal accessories, there is no need to spend extra money on accessories. In short, it is convenient, fast, and easy to debug in the early stages of development. At the same time, when using a microcontroller to control the SIM900A module, this 232 level serial port can also be connected to a computer to monitor the real-time execution of each instruction output by the SIM900A module to the microcontroller, thereby quickly identifying any problems with the microcontroller program. This is also different from other sellers.
--The SIM900A module supports 5V power supply and DC power supply of 1A or above. During the initial stage of computer debugging, USB power supply is sufficient. It is recommended to use DC power supply of 1A or above for long-term data transmission. One TTL serial port compatible with 5V and 3.3V microcontrollers. Provide sleep data, with a power consumption of around 10MA.
The SIM900A module supports 2G, 3G, and 4G SIM cards.
Package Connection
Module video link: http://pan.baidu.com/s/1o6NUk0i Password: p3a8
SIM900A module with 4.5-5.2V 1A power supply, recommended 5V power supply. The TTL interface is compatible with 5V and 3.3V systems (such as ordinary 51 microcontrollers, STM32, etc.), and this model is shipped by default.
Data link: http://pan.baidu.com/s/1pKIuf
The second type of SIM900A module, powered by 3.5-4.5V 1.5A (can be directly powered by mobile phone batteries), is compatible with 3.3V microcontrollers. The 5V microcontroller requires an RS232 level control module.
Data link: http://pan.baidu.com/s/1dDBxoeX (Unzip password 789)
3、 Introduction to SIM900A module functional interfaces
TTL interface circuit: The module comes with a set of TTL level interfaces, compatible with 3.3V and 5V systems.
RS232 interface: The module comes with a set of standard RS232 level interfaces, replacing DB9 with three pins, greatly reducing the size of the module. At the same time, the circuit is designed with anti surge protection, which is stable and reliable.
SIM card circuit: Add SMF05C electrostatic discharge chip.
Antenna circuit: Ensure it is short and straight to ensure signal strength.
PCB display: Each interface is silk screened and marked for easy secondary development.
Humanized design, each interface has silk screen markings, making it easy to use at a glance; The interface position design and arrangement are reasonable and convenient.
Adopting international A-level PCB materials and gold deposition technology. New device processing, pure copper gold-plated needle, sturdy and durable.
The PCB size is 48 * 49MM, with installation positioning holes, compact and exquisite, easy to embed.
