We know that the root of smart devices lies in the development and application of embedded systems (embedded system development process). With the continuous development of electronic technology, many intelligent devices have gradually replaced manual labor. Vending machines are one of them based on embedded. The system's intelligent equipment (what is an embedded system), for the embedded system design example, Xiaobian takes the vending machine software and hardware design as an example to simply introduce the embedded system application. Let's take a look at the knowledge about vending machines (embedded system programming).
The mobile value-added service of vending machines is a new business model and a new market channel, and has a large customer base. Due to the mobility, convenience and security of mobile e-commerce, it will attract many merchants and customers to use it for business and consumption activities. This will lead to the formation of the mobile value chain, successfully bind users, integrate them into all walks of life in society, and make all walks of life in society inseparable from mobile, and ultimately form a "win-win" situation.
Hardware design of embedded system in vending machine
(1) part of the microcontroller
Atmel's ATmegal28 microcontroller integrates a large memory and a rich hardware interface: timer/counter, real-time clock, PWM channel, A/D converter, 12C serial interface, programmable serial USART Interface, SPI serial interface, programmable watchdog timer with on-chip crystal and on-chip analog comparator. It is unique in terms of power saving performance, stability, interference immunity and flexibility. The MCU system is powered by a 5 V power supply, and the external power supply is 24 V. The LM2576s chip switching power supply is converted to 5 V, which is the system main power supply.
(2) GSM/GPRS module
The GSM/GPRS module uses the M22 module of BENQ, as shown in Figure 1.
GSM/GPRS module adopts BENQ's M22 module
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