Do you know someone that types with the Caps Lock on? How would you like to modify their keyboard so that it yells at them when they hit the Caps Lock key? In this project I am going to show you how to do just that. All you have to do is wire a small sound module to the circuit board inside the keyboard. You don't even need to solder anything.
Step 1: Materials
2 feet of thin insulated wire
Step 2: Select a Sound Module
Each sound module is wired together differently. On my sound module, one side of the play switch is connected to ground and the other side of the play switch is connected to the microchip on the board. If your sound module is wired together differently, then you may need to modify the procedure slightly.
Step 3: Open Up the Keyboard
Step 4: Connect a Jumper Wire to the Negative Input Wire of the Keyboard
Take a one foot long section of your wire and strip the insulation off of the ends. Then connect one end to one of the negative input wires on the keyboard. In my case, I was able to just insert the wire into the pin connector on the board.
Step 5: Connect the Negative Wire From the Keyboard to the Negative Wire on the Sound Module
Step 6: Connect a Second Wire to the Play Switch on the Sound Module
Start by locating the play switch. Then determine which side of the switch is connected to the negative terminal (ground) and which side of the switch is connected to the processor chip.
Take a second piece of wire and strip the insulation off the ends. Then connect one end of the wire to the side of the switch that is wired to the chip on the sound module (not the side that is connected the negative terminal).
Fortunately there was an open pin hole on the board that was connected to the appropriate side of the switch. To connect to it, I just inserted the wire through the hole and then twisted the wire against itself so that it made a tight connection with the board. I didn't even need to solder it.
Step 7: Connect the Play Switch on the Sound Module to the Caps Lock LED or Its Resistor
We want to connect the wire from the play switch on the sound module to one of the terminals on the LED or its resistor. The best place to connect the wire is the terminal on the LED or the resistor that is closest to the integrated circuit. This terminal will have the lowest voltage when he LED is activated. By connecting the play switch to this low voltage, it will simulate the play switch being pressed and activate the sound module.
Turn on the Caps Lock function so that the LED is on. Then take the free end of the wire that is attached to the play switch and touch it to the terminals on the LED and the resistor. At least one of the terminals will activate the play function on the sound module. On my keyboard, touching the wire to either terminal of the resistor activated the play function.
I connected the wire at this point by looping it around the lead of the resistor and then twisting it so that it was tight and made a good connection. Then I wrapped the end of the wire in tape to prevent any unwanted shorts.