Well I asked about using an Arduino to control a pinball here a while ago and between then and now I have learned a lot through experimentation about the Arduino and electronics in general. Here is what I have so far:
I scaled the challenge down a bit and found a free Funrise pinball machine. it is basically a passive pinball machine, only a spinning bumper and the flippers add momentum to the ball. So i used three 4021 shift registers to control the input from the playfield, and it works yeah!!
I also ordered a MAX7221 led controller which arrived Friday and I started building a schematic to incorporate it into my controller. I have a few questions about using the IC that just are not very clear from reading the article in the playground and the data sheet. The article has two caps, one is 10uf and the other is 100n and it states they are both important for noise reduction. Now the data sheet only shows a .1uf cap and if I have read it closely then the data sheet doesn’t make a big deal out of the cap at all. So my question is can I use a simple #104 cap on this IC or do I need more. The other thing about it is can I reuse the Latch and Clock pins from the 4021’s or do they have to be independent?
My next question is for advice with the schematic, if there are suggestions for improving it or even a problem that I am completely missing. The first part up to the Amtel IC is what I am planing to replace the Arduino development board after it is complete so if the power supply looks wrong in some way please say so as I borrowed it from an Instructable. After the 4021’s Im using resistor networks so i don’t know if I hooked them up right in the schematic, when I switch over to the board view they seem to come out ok. Finally in the schematic I have just started incorporating the MAX7221 into it so its just components right now but the major one is represented in the 4 character LED display that the machine uses, so as I watch expectantly for someone to reply to this post I will be working out the rest of that as well.
Thanks in advance for all the help that this forum has offered in this project.