Vacuum Tweezer

Replacement board for a Quick 381A. Old board died and I wanted to add some features anyway.

TODO (for better matching with existing mating parts):

• hole pattern needs to be ~5mm wider
• change connector for footswitch to a 2.54mm one
• change ac input connector to 3.81 one
• change potentiometer connector from 3pin to 2pin with added internal 270k pullup
• optimize PWM duty cycle range
• code is very qnd, but quite usable

Connections:

• mains input to transformer primary; cut wires and connect with WAGOs.
• transformer secondary to ac input of pcb
• pump and valve to respective output terminals (cut wires and connect to screw terminals or change pcb to use original 3.81mm connector)
• footswitch
• led (connect to one of the led outputs, power or software controlled led)
• PE lead from the motor to the chassis
• optional: add a mode switch to the frontpanel and connect it with three wires to the remaining switch input connector (can be used to select inverted footswitch mode)