Pedro Drummond wrote:

> I heard something about a PCB tray that senses objects placed on it (and
> when they are taken from it). This seems to do the job. I heard the PCB
> itself would be able to sense it, with no external components. How ? Using
> the object to alter the capacitance between two tracks ?
>

Look for "Charge-Transfer Touch Sensor" from Quantum Research Group Ltd

Gaston

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