New - Microchip mTouch inductiv sensing

[rmteo]

Hello All

Microchip have the new mTouch sensing inductiv detection on
http://www.microchip.com/stellent/id...param=en538309

that can be done with any PIC witch ADC. Unfortunaly the examples code is in C. Exists the possibility that anyone can translate that code to PBP Pro?

Thanks
Best regards

Pedro

I have implemented mTouch with capacitive (timers instead of ADC) detection to scan the 24 buttons on this project using a PIC18F44K20 at 64MHz - not with PBP but another compiler though.

[Kamikaze47]

I have implemented mTouch with capacitive (timers instead of ADC) detection

Is there info on how to achieve that? Everything I can find deals with the inductive method.

[rmteo]

There is a whole bunch of info on capacitive sensing here:
http://www.microchip.com/stellent/id...GE&nodeId=2695

[Pedro Santos]

Hello

Capacitive sensing is another story, for that exists ic's from Quantum that work very well. Inductive sensing is more complex, then you must prepair
the painel mechanical with a few layers.

Regards
Pedro

[rmteo]

What advantages do you see of inductive over capacitive sensing?

[tenaja]

M'chip has a pro/con chart:
http://www.microchip.com/stellent/id...param=en535162

[Pedro Santos]

Hello rmteo
Not advantage, but you can't use a capacitve keyboard for blind people, in that case the capacitive sensing is not usable

Regards
Pedro

[rmteo]

OK, thanks Pedro. tenaja, thanks - I saw that.

[rmteo]

Hello

Capacitive sensing is another story, for that exists ic's from Quantum that work very well.

Regards
Pedro

I am using a TS555 (CMOS version of the LM555) as a free-running oscillator at 1.1MHz. The touch buttons are routed through two 74HC4067 16-to-1 multiplexers to the TS555 as its timing capacitor (currently using only 24 inputs with 8 spare). The output of the TS55 is connected to TMR1 of the PIC which selects the inputs of the multiplexers and is also used to interface with 128x64 GLCD.