Well I have the 1MHz from PIC output available.

Octavio Nogueira
Tato Equipamentos Eletr=F4nicos Ltda
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-----Mensagem original-----
De: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] Em nome de
Jinx
Enviada em: sexta-feira, 3 de fevereiro de 2006 10:50
Para: Microcontroller discussion list - Public.
Assunto: Re: [PIC]: QT113H emulation


> The problem is I NEED want to emulate this behaviour wiht
> a pic 12F675.

Octavio, I've done something similar with CMOS logic, and I'm sure it
would work with a PIC. I'll draw a schematic later today

Basically, a 4011 oscillator drives a diode bridge at ~ 75kHz (frequency
not too important). Across the other bridge terminals is a 1n0 cap, and
from there to ground is a 47p cap. The aerial is also connected to this
bridge. When an object like a hand or finger disturbs the aerial's
field, the voltage across the 1n0 drops. A CA3140 op-amp amplifies and
smooths this, followed by a Schmitt trigger to make a digital output.
The output of the amp is easily measurable. I forget the gain off-hand,
think it might have been about 20 =




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