USB Typewriter

Step 7 MARK THE CONTACT LOCATIONS

Place the blank sensor board onto the crossbar in the same position you intend to mount it.  Then, use a Sharpie pen to mark off the approximate locations that the contacts need to be attached.  One contact is needed for each key-bar that is underneath the crossbar. Do not worry if your marks are not very precise -- the contacts are flexible and will eventually be bent into the correct position.