[Resource Download] The download address is as follows:
https://docs.qq.com/doc/DTlRSd01BZXNpRUxl
51 Speed Detection System Design-Hall-LCD1602-LED
This design consists of STC89C52 single-chip circuit + Hall speed sensor circuit + LED indicator circuit + LCD1602 liquid crystal display circuit + power supply circuit.
1. Real-time LCD display speed.
2. If the speed is 0-1km/h. Only the green light is on, and only the port corresponding to the green light outputs low level.
3. If the speed is 1-1.5km/h. Only the yellow light is on, and only the port corresponding to the yellow light outputs low level.
4. If the speed is 1.5-2km/h. Only the red light is on, and only the port corresponding to the red light outputs low level.
4. If the speed exceeds 2km/h. Only the blue light is on, and only the port corresponding to the blue light outputs low level.
The diameter is 2cm.
