Step 1: What You Need
This circuit can be added to any mouse. Yes, that's any mouse, following these simple steps.
For this Instructable, you will need:
- 555 Timer IC
- 8-Pin IC Socket (static discharge or heat from soldering tends to ruin 555s, so we use a socket)
- 10K Resistor
- 1K Resistor
- 4.7uF Capacitor (voltage doesn't matter, as long as it's 5V or over)
- Normally-Open Pushbutton Switch (any kind will do)
- Some wire
- Glue (to adhere the switch to the mouse, so hot glue or epoxy will work well for this)
- Soldering Iron
- Wire snips
- Fine-nosed Pliers
Step 2: Constructing the Circuit
This technique of building circuits is called "discrete wiring", or more frequently, the "dead bug technique". For simple circuits like this one, it can be used without worry, but anything much larger, and you should definitely use a circuit board.
Step 3: Connecting the Circuit to Your Mouse
Disassemble your mouse so you have access to both sides of the circuit board.
First, you need to follow the path on the circuit board to determine on which side of the switch to solder your pushbutton. You want the side that leads back to the mouse's microcontroller, since we will be feeding 5V pulses into it. If you use the side that leads back to the +5V supply on the mouse, your mod will not work.
Use your wire to connect the switch.
At this point, you can insert the 555, plug in your mouse, and test to see if everything's working the way it should.
Step 4: Mount the Switch to the Mouse.
Use epoxy or hot glue to hold the switch in place permanently.
Once the glue is cured, and the wires are connected, reassemble the mouse, making sure that the 555 circuit doesn't short anything out, and vice-versa. If you choose, wrap the 555 circuit in tape to prevent shorting things with it.