My friend bought an old Pepsi machine for his new house. Right now it requires at least a nickel to vend, it uses an old dip switch coin mechanism, half of the "out of stock" lights don't work, the big Pepsi logo doesn't light up, the screen that displays the amount does not work, and the compressor makes a winning noise, but works fine otherwise.
We are going to school for computer and electronics engineering, so we are turning it into our final project. We plan to replace the current screen that doesn't work with a more modern screen, and we are going to remove the coin mechanism and wire it to vend free, and display the choice an the screen for this quarter. Next quarter we plan to to remove all the old buttons and mane then digital screens that we can program different pictures of drinks onto for vending.
So we have decent knowledge of electronics and I'm pretty good at C programming, there is a wiring diagram on the inside, and he thinks he knows how to fix the compressor whining. My question is this, do you have any recommendations for the circuit board we should use to wire it up to show what the selection is, and eventually be used to run the digital buttons. Maybe some suggestions on the screen to use and for the buttons later?
Thank you for your help, and I will post pics soon.