[MCU club] design of classroom number detection based on MCU [physical design]

Item number ：mcuclub-324
Design brief ：
Information download website ：www.mcuclub.cn
Project name ： The design of classroom number detection based on MCU
Single chip microcomputer ：STC89C52
Function introduction ：
1、 adopt 2 Simulate the classroom door for the infrared radiation tube , Check the current number of people entering the classroom
2、 The number of people can be set by pressing the key , When the confirm key is pressed , Eventually, if the number of people is too large or too small, audible and visual alarm will be given
3、 adopt LCD1602 Display the set value of classroom number 、 Current classroom population detection value

Data preview
design sketch ：

Overall physical data ：

Schematic diagram ：

PCB:

Software design process ：

System diagram ：

This design is based on STC89C52 Single chip microcomputer is the core controller , Together with other modules, it forms the whole system of classroom population detection , It contains the central control part 、 Input part and output part . The central control part adopts STC89C52 Single chip microcomputer , Its main function is to obtain part of the input data , After internal treatment , Control output section . The input consists of four parts , The first part is the detection module of infrared radiation tube , The second part is the infrared detector module , These two parts are used to detect the current number of students in the classroom , When entering the classroom, the infrared collimator tube triggers first , After leaving the classroom, the infrared radiation tube triggers , Number of people entering the classroom +1, When the infrared radiation tube out of the classroom triggers first , After entering the classroom, the infrared collimator triggers , Current number of students in the classroom -1; The third part is the independent key module , Switch the interface through this module , Set the number of students in the classroom ; The fourth part is the power supply module , The module can supply power to the whole system . The output consists of three parts , In the first part LCD1602 Display module , This module displays the set number of people and the number of people currently arriving in the classroom ; The second and third parts are the sound and light alarm module , When the current number of people is less than the set number of people in the corresponding channel , Audible and visual alarm reminder .

Hardware list ：