The two bins of laptop keyboards shown above are from Re-PC, a local recycling store. The keyboard controller drives each row low, one at a time while reading the columns (with a pull up resistor) to see if any switch is pushed. Laptop keyboards use a flexible printed circuit (FPC) that connects all the key switches in an array of rows and columns as shown above. I will include download buttons for many of the files in the Instructable but all the files are located at my GitHub repository.
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