Re: Mtouch switch using PIC 12F510
1,2,3,4,5,6,100, 100 000 sensor solution is the same.
Rough explanation, your body act as a capacitor between the sensor and the circuit ground. By the time the Pin is low, if you add an small capacitance on the pin, set the pin high the read then pin, the pin will read low because the capacitor haven't got time to "charge"... period. simple. Really old way to do it.
You can also do it with a spare CMOS input,Darlington transistor, FET, OpAmp... etc etc etc.
Plug your home theater sound system, set it to line input, crank the volume to the max, insert a needle in the RCA center pin woohoo you got a signal!!!
mTouch use ADC reading, probably more accurate and versatile... no real extra parts.... on both solution, you need a fairly good PCB design.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
Bookmarks