So, now you know which pins produce which letters. It will help you immensely if you make a similar chart for the keyboard you are working on. Please remember that all keyboards are different. Below is a chart that I made for the particular keyboard I was working on. One way to simplify the matter is to consider one sheet "SIDE A" and the other "SIDE B". Once you have labeled both plastic sheets with all of the corresponding keys (that you plan to use in your project), the next thing you need to do is to trace the letters back to the circuit board with a Sharpie (see notes on pictures). So, for instance, if you were to press down "A" on the keyboard, label the plastic circle on both sheets of plastic that would be pushed together if the "A" key would strike (see picture of labeled sheets). What you need to do is to label each conductive circle on both sheets with the letter key that corresponds to it. This completes the circuit and tells the board to send a letter, number or command back to the computer. When you press down on a key, the tracings on both sheets will touch each other. One plastic sheet will have printed conductive tracings that go to one set of pins on the circuit board and the other sheet will have tracings that go to another set of pins on the circuit board. The inside of the case should have two plastic sheets (one on top of the other).
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