Re: Cheapest object sensor on the market!

On Apr 6, 4:22 pm, "raedarrar" <i...@xxxxxxxx> wrote:

Do you have another option (not touch) as cheap as the one above that
detects within 50mm to 100mm?  

Google "digital theremin". With essentially a schmitt-trigger inverter
and a few passives, you can create a capacitance-based circuit to
detect the approach of a body part. But it is fairly difficult to
design one that is tolerant of voltage and temperature changes. Easier
with a micro. TI also has an app note on doing this with an
MSP430F20xx, which is very cheap in large quantity - well under your
price target.


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