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Topic: Conecting Antenas to Arduino (simplified Theremin) (Read 420 times) previous topic - next topic

porres

Hi, my project is to conect an antena to the arduino board... if you guys are familiar with the theremin ( http://en.wikipedia.org/wiki/Theremin ) you got the idea that with aproximation to the antena we can control the pitch of sound... well, by conecting only the antena to the arduino I could have a simplified circuit of the theremin and use it to control any parameter of sound or other... hence, a simplified theremin circuit used for generic purposes...

well, that is the idea... now the question is what would be the easier way to concect it to arduino... for now I think it is a matter of getting the antena to work as a regular potenciometer... but then, I'm clueless cause I know nothing bout antenas, electronics, electromagnetism, whatever...

so, is it really the best way to do so? Is there any other procedure or even a similar concept? Is there something plug and play for antenas?

Thanks a bunch folks.
CHEERS!

jon

an antenna is basically a capacitor.  theremins operate by responding to changes in the antenna's capacitance, which occur when objects (like your hand) move closer to, or further away from it.

if you want to use arduino to make an antenna-based controller or theremin, you need to figure out a way in which it can 'read' the capacitance of the antenna.  converting the antenna capacitance to a variable resistance value (in other words, turning it into a potentiometer) may require some complex, or at least unnecessary, circuitry.  i've been experimenting with quantum's QT300 capacitance-to-digital sensor, which dierctly measures the capacitance of an object connected to it, then returns a 16-bit digital value relating to the measurement.  there may be other ways to measure capacitance - perhaps you could try using arduino to directly measure the antenna capacitance somehow?

let me know if you have any luck!

jon

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