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I also found this thread, which talks about another technique:
https://www.electro-tech-online.com/threads/touch-activated-switches.102791/
Alternatively, could I attach the signal wire on one end of my brick, and the sensor on the other side of the brick. Then when I touch it it might alter the signal picked up by the receiver?
Urgh this is too complicated
Alternatively, could I attach the signal wire on one end of my brick, and the sensor on the other side of the brick. Then when I touch it it might alter the signal picked up by the receiver?
Urgh this is too complicated
Hi Killivolt, thank you for your reply. I understand that I attach the sensor to the brick, to "pick up" when I touch it, and I understand the receiver wire would be connected to my pic (possibly more complicated than that) so my PIC knows the situation, but im still a bit confused about the exciter signal. What would I do with the exciter signal in my circuit, would I attach it to the other side of the brick?
That makes a bit more sense. If I can say this outside of my head to confirm ive got it right.
Exciter Signal circuit generates a high frequency signal which is sent out to the sensor. This sensor is attached to the aluminium brick. The control wire then comes out of the sensor and (via a not yet defined circuit) connects to the PIC. Is this correct?
The sensor has the job of not only sending out the signal but also detecting a change?
I haven't actually make the brick yet, but I had a dig around and found some aluminium step plate. I used my somewhat unreliable multimeter to measure it and it gave a reading of 0.5 ohm
In my experience touch switches (of any type) are incredibly unreliable - I wouldn't consider using one.
With battery maybe. As the voltage runs down the thresholds will change but if run from a solid power source they can be very reliable.
Is 20cm x 35 cm x 0.8 cm plate 0.5 ohms. If not, i'll do some calculations to see if I can make an estimate