Learning theory and getting degree will not be worth until you have some practical experience. Most of computer IT engineering software engineering students get hands on softwares before they pass out. But geeks interested in hardware might not get a chance to open up a hardware. TeraBug Hardware Unscrew week gives you a chance to see inside the hardwares you use in daily life.
Everyday we will unscrew a hardware. I will try to explain as much as I can. You can also give it a try on the same or similar hardware at your home but only at your own risk.
Today on the day 1 I will start with small but very useful hardware, the youngsters’ favorite, Mouse. I have got a brand new intex mouse and lets see what they are using inside it.
Tools required: PH screwdriver.
I have got a magnetic screwdriver set for Rs. 80. You can get it for cheaper from local market. (Pic below)
Lets start it:
Image 1:Working Intex mouse.
Image 2 (click to enlarge): Mouse with PH screw driver (4 Pins screwdriver looks like x )
Image 3 (click to enlarge): Two screws location.
Image 4: Unscrewing
Image 5 (click to enlarge): First look, Unscrewed
Image 6 (click to enlarge): First look, Unscrewed
Image 7: Circuit parts
1 – Button SWR ( Left click )
2 – Wires L to R, Data + input , Data – input, GND ,VCC
3 – Capacitors
4,6 – Resistors
5 – Optical Light source
7 – Sensor IC
8 – LED Indicator
9 – Button SWR ( Right Click )
10 – Button SWR ( Middle Click )
11 – Scroll wheel
Image 8: Back part of circuit.
1 – Optical light/motion sensor
Image 9 (click to enlarge): Working circuit.
Conclusion: Optical motion devices are easy to make. Just need an optical source & optical detection IC. We can implement other device than a mouse. e.g. optical burglar alert.