stc12 small industrial control board

1_The main control adopts STC12C5A60SA DIP package. 2_A serial port to USB, using ch340g chip. 3_ It has an EMI filter circuit that can effectively reduce common mode noise and effectively increase the reliability of high-precision sensors. The 5V part has a maximum output of 3A, and the 3.3V part has a maximum output of 1A. It has full power (this is why it is called an industrial control board) (but this is not what I studied) Very in-depth, please point out if there are any mistakes) 4_Three controllable LED indicators and an active buzzer driven by an optocoupler. 5_Four independent keyboards, hardware anti-shake. 6_Four optocoupler isolated universal inputs, 24v input/12v input/5v input can be achieved by replacing the R12.R13.R14.R15 resistors. 7_Two optocoupler isolated DC motor drive outputs can also drive a stepper motor. You can select 5v or 12v by switching the jumper at P11. The maximum current does not exceed 3A. The motor driver uses RZ7889. The built-in diode can release the reverse impact of inductive loads. current . Suitable for motors, automatic valves, electromagnetic door locks, etc., the standby current is extremely small. 8_ Lead out the serial port download pin, which is convenient for downloading and connecting to the serial port screen. And there are two LED lights on the serial port line, which can function as a simple oscilloscope during microcontroller communication.