The card printing system is based on the study of single-chip W77E58, the controller is made up of main Control module, motor control and power module, serial communication module, LCD module and keyboard input and so on. with the cable, the single-chip connect each module in the Internet and transmit data.
Here we use a single-phase capacitor induction motor to drive the machine, Microcontroller software comparing motor speed and received feedback speed, according PID control, SCR trigger by controlling the optical coupler, change the date of trigger point, to change conduction angle of 220V sine wave, then achieve the seted speed