Schematic: Altium Designer
Original version of simulation: proteus 7.8
Program compiler: keil 4/keil 5
Programming language: C language
Design number: S0013
basic skills:
1. This design is based on STC89C51/52 (common to AT89C51/52 and AT89S51/52, optional) microcontroller;
2. The upper and lower limits of the AT24c02 chip power-down storage setting;
3. The four buttons are set, add, subtract and confirm to realize the adjustment of the threshold;
4. LCD1602 liquid crystal display, the upper row displays the current temperature and humidity, and the lower row displays the corresponding cold, hot, dry, and wet;
5. Equipped with a fully digital temperature and humidity sensor DHT11, the temperature measurement range is 0℃--50℃, and the humidity measurement range is 20%RH-90%RH, which can meet general needs;
6. When the threshold value is exceeded, a buzzer will flash to alert you. And there is a switch to turn off or turn on the alarm;
7. When the temperature or humidity exceeds the limit, the alarm signal light will light up and the corresponding relay will close. Relays can drive on or off external devices such as ventilators, dehumidifiers, heaters, refrigerators, humidifiers, alarms, etc.
Simulation circuit:
programming:
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