Ultrasonic ranging based on 51 microcontroller

The system description required by the question
: Ultrasonic ranging can be used for car reversing radar, obstacle avoidance of robots and cars, liquid level detection, etc. It is a convenient, fast and reliable non-contact detection method. This design uses an ultrasonic probe to make an automatic ranging device.
System functional requirements: (1) The ultrasonic transmission and reception functions are normal and can display the distance of obstacles in real time (digital tube or LCD display is not limited); (2) This design requires the ultrasonic probe to design the transmission and reception circuit by yourself, and the use of ready-made modules is not allowed. (3) Differentiate alarms when the distance is less than 30cm and 15cm. Less than 30cm is the warning distance and less than 15cm is the danger distance; the measurement distance error is less than 2%; it has a mechanical installation design, is easy to use and has good practicality.
Tips:
1. This design requires a certain foundation in analog electronics and good circuit welding skills. Unreasonable circuit welding, component layout and wiring may directly lead to failure;
2. Differentiate between R and S probes;
3. Check the quality of the probe before welding to ensure that the probe is normal.
Problem Analysis
Hints: Analyze and explain the entire problem or the main part of the problem content.
 
Hints: Overall design scheme block diagram: Schematic diagram design description
Ultrasonic module schematic diagram (refer to CS100A ultrasonic transceiver module design circuit)
Microcontroller minimum system:
(1) Type-C power supply
(2) P0 output pull-up
 
buzzer alarm circuit:
Ancient LCD display:
PCB design instructions
Hints: Here are some design instructions for the PCB, such as: PCB layout, wiring, line width, spacing and other design considerations
Software instructions
Hints: Software can be nested using code blocks. It is not necessary to explain all parts of the software. Only the important parts need to be explained. Code block:
#include
void main()
{
printf(""/n);
Physical

Demonstration Instructions
and Precautions
: This section outlines some important considerations during the creation of your work (optional).
Demonstration Video
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Other Attachment Upload
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