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Threshold Setting Alarm System for Temperature, Humidity, and PM2.5 Detection Based on 51 Microcontroller
(Program, Proteus Simulation, Program Flowchart)
01
Function Introduction
Specific Functions:
1. This design is based on STC89C51/52 (compatible with AT89S51/52, AT89C51/52).
2. Accurate measurement of temperature and humidity using the DHT11 temperature and humidity sensor.
3. The LCD1602 display shows temperature, humidity, dust (PM2.5), and their upper and lower limit thresholds.
4. The value of dust (PM2.5) is collected and adjusted using a sliding potentiometer.
5. The upper and lower limit thresholds for temperature, humidity, and dust (PM2.5) can be set using buttons.
6. When temperature, humidity, or dust (PM2.5) exceeds the upper limit or falls below the lower limit, the buzzer will sound an alarm. The corresponding LED light will also illuminate.
02
Hardware Design
Components Used:
51 Microcontroller, DHT11 Temperature and Humidity Sensor, LCD1602 Display, Buzzer, LED Light
Microcontroller: 51;
(Note: The microcontroller is universal, whether 51 or 52, whether STC or AT, the pin functions are the same. The program is also the same.)
03
Design Materials
01
Simulation Diagram
This design uses Proteus for design! As shown in the figure!
02
Program Source Code
This design uses Keil for programming design! As shown in the figure!
03
Design Materials
All materials include the program (with comments), Proteus simulation, program flowchart, etc. The specific content is as follows, the most comprehensive on the internet!
Material Acquisition
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