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Step 2Trace the letters back to the pins
The inside of the case should have two plastic sheets (one on top of the 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.
When you press down on a key, the tracings on both sheets will touch each other. This completes the circuit and tells the board to send a letter, number or command back to the computer.
What you need to do is to label each conductive circle on both sheets with the letter key that corresponds to it. 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).
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).
One way to simplify the matter is to consider one sheet "SIDE A" and the other "SIDE B" .
Below is a chart that I made for the particular keyboard I was working on. Please remember that all keyboards are different. It will help you immensely if you make a similar chart for the keyboard you are working on.
PIN LAYOUT:
| | | | | | | | XXXXXX | | X | | | | | | | | X
1234 5678 12 11 10 98765 432 1
SIDE A SIDE B
PIN SIDE A
A01 - 0, 9, 8, 7, 4, 3, 2, 1
A02 - 6, 5, -
A03 - N, B, ?(slash)
A04 - (period), (comma), M, V, C, X, Z, (enter)
A05 - H, G, (space), '
A06 - L, K, J, F, D, S, A, ;
A07 - Y, T
A08 - P, O, I, U, R, E, W, Q
PIN SIDE B
A02 - 1, Q, A, Z
A03 - 2, W, S, X
A04 - 3, E, D, C
A05 - 4, 5, R, T, F, G, V, B
A06 - 6, 7, Y, U, H, J, N, M
A07 - 8, I, K, (comma)
A08 - 9, O, L, (period)
A09 - P, 0, ?, -, ', ;
A11 - (enter)
A12 - (space)
When you press down on a key, the tracings on both sheets will touch each other. This completes the circuit and tells the board to send a letter, number or command back to the computer.
What you need to do is to label each conductive circle on both sheets with the letter key that corresponds to it. 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).
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).
One way to simplify the matter is to consider one sheet "SIDE A" and the other "SIDE B" .
Below is a chart that I made for the particular keyboard I was working on. Please remember that all keyboards are different. It will help you immensely if you make a similar chart for the keyboard you are working on.
PIN LAYOUT:
| | | | | | | | XXXXXX | | X | | | | | | | | X
1234 5678 12 11 10 98765 432 1
SIDE A SIDE B
PIN SIDE A
A01 - 0, 9, 8, 7, 4, 3, 2, 1
A02 - 6, 5, -
A03 - N, B, ?(slash)
A04 - (period), (comma), M, V, C, X, Z, (enter)
A05 - H, G, (space), '
A06 - L, K, J, F, D, S, A, ;
A07 - Y, T
A08 - P, O, I, U, R, E, W, Q
PIN SIDE B
A02 - 1, Q, A, Z
A03 - 2, W, S, X
A04 - 3, E, D, C
A05 - 4, 5, R, T, F, G, V, B
A06 - 6, 7, Y, U, H, J, N, M
A07 - 8, I, K, (comma)
A08 - 9, O, L, (period)
A09 - P, 0, ?, -, ', ;
A11 - (enter)
A12 - (space)
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Put one of the layers on a image scanner, scan it and fill the lines with different colors using the fill tool. Took me only 30 minutes to get the entire pin layout