Simple design, Cash drawer

Discussion in 'The Projects Forum' started by hawk7890, Mar 21, 2011.

  1. hawk7890

    Thread Starter New Member

    Mar 21, 2011
    1
    0
    I have 2 cash drawers, one is using an epson receipt printer wheras the other is using a serial port. The one with the serial port used to be a receit printer type but has been modified. I am looking to make the same modification to the one currently using the printer. Unfortunately I have a partial template as the person who made the circuit board put half the board under a ton of glue. below are all the details of the circuis I can see and hopefully someone can "fill in the blank"


    Visible Components:
    9 pin serial
    12v power adaptor
    Solenoid/electro magnet
    Large polarized capacitor, Value unknown, assuming 470uf
    Diode (I think)

    Everything between the dashed lines are connected together
    -------------------------------
    Serial port pins
    4(Data terminal ready)
    8(Clear to send)
    6(data Set Ready)
    White wire, goes to unvisible connection
    ------------------
    Pin 5 (ground)
    - side of diode
    - side of solenoid
    To unvisible location
    -------------------------------
    VCC -
    Capacitor -
    Unvisible location
    --------------------------------
    VCC +
    Capacitor +
    Diode +
    Solenoid +
    ----------------------------------

    I am quite advanced when it comes to logic design, but I have difficulty when other components are involved.

    The way I figure the circuit works is like a relay. When the serial port triggers, it discharges the capacitor to the solenoid to open the drawer. The solenoid requires somewhere around 12-22 volts but the serial port only generates 5v.

    any help would be greatly appreciated.

    Thank you
    Marc
     
Loading...