Hey everyone
Welcome
back to my Blog today, I am making a touch switch which is use to turn on the
computer by touch of your finger just like smart phone.
Let’s make
it.
Every
computer has a power button which turn on computer, the button comes with CPU
case it’s a physical type which we have to press until its contact pin
connected to each other. Its look like old school, then I thought that can I
make the computer on by just touch of my finger.
After
thinking about it I find a solution for it which is simple and easy to make and
it’s don’t require any microcontroller.
Component
1)Touch
sensor X 1
2)Opto-coupler
X 1
3)Resistor
270ohms X 1
And some
basic tools and wire (old USB for powering and a female connector)
Working
I am using
simple touch sensor which is named as TTP223 which is really chip in price and
perfume well as per my requirement and it is small in size
To turn on
the computer this terminal 5and 6 is need to sorted which is done by power button.
The sensor
cannot directly connect to the pc because its work on 5 v and we cannot drive
current through the power button of the PC for isolating both the side simply I
am using an optocoupler.
Optocoupler
is device which optically isolate two side of circuit, as in name its uses
light to activate transistor as shown in figure. I am using 4n35 optocoupler as
I am having it but any optocoupler is usable as its job is only connect two terminals
when its on
Circuit
diagram
I made all
the connection as per in the circuit Diagram it required 5v for that I attached
USB cable by which it can power directly by computer or a 5v adapter.
As show in
figure I attached the one side of optocoupler to the touch sensor. Whenever I
touch the sensor, it turns on the optocoupler which result in sorting the
terminal 5 and 4(). As it is activating by light there is no physical
connection between two of the side which is most required in this project
At the end
its is easy to make and look cool but it has some down side if you touch it by
mistake it will turn on or turn of your computer.
Video Link
Subscribe to my youtube channel
Final Assembly
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