This is a motion control system for a wheeled robot based on a 51 single-chip microcomputer.
I have found a lot of information on the Internet, but none of them are very complete. The one I uploaded is my circuit, which uses the old chip L293, and the main control chip is a 51 single-chip microcomputer. This circuit uses an optocoupler to isolate the motor ground and power ground, and also uses a 74HC04 as an inverter to facilitate programming. The circuit diagram is very simple, but no one has done it so comprehensively. Without further ado, here is the picture.
I won't talk about the microcontroller part. The BD1 and other components used in the L293 part are magnetic beads, which are used to achieve single-point grounding and power isolation. Those IN4007s are freewheeling diodes. There are not many capacitive filter capacitors.
Below is the pin control table of L293:
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