1. The main control chip is simple and cheap to use STC89C52RC; 2. The download circuit of the chip can be completed by converting USBZ to TTL to complete the program download; 3. Use the digital tube to complete timing, stopwatch and other demonstrations. This is a four-in-one common anode digital tube. Using NPN for driving, the solution is simple; 4. The device used is a direct plug-in type, easy to weld, and friendly to novices. I also gradually changed from a direct plug-in type to a SMD type, and the difficulty of welding is very different between the two; 5. Drive circuit You can refer to the LM298N module design in the open source community; 7. Just put black tape on the ground; 9. The line patrol principle is in the attachment; 10. The procedures and attachments are as follows;
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