Piezoelectric transmitter

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brimsant

New Member
So currently I've built this piezoelectric harvester that stores the rectified power in a capacitor which is also connected to a comparator. What I want to happen is that once the voltage of the capacitor surpassed the threshold of the comparator (haven't set it yet but 2-3V), I plan to discharge the capacitor into a transmitter that sends off a signal. Then, the capacitor goes back to charging.

My main issue right now if that I have no idea how to make the transmitter, can someone help guide me on how I could go about making it?

Thanks in advance
 
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How are you going to store energy in your 22uF cap? Right now, the charge immediately discharges through your two 1k resistors. A fully charged capacitor will discharge in under a second if you can ever get it charged with the leak you have.

And, 3v isn't a "power" unit as you stated above. Watts is power. How many watts do you need snd how long do you need the circuit to be active to make a connection and transmit some information.
 
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ZipZapOuch said:
How are you going to store energy in your 22uF cap? Right now, the charge immediately discharges through your two 1k resistors. A fully charged capacitor will discharge in under a second if you can ever get it charged with the leak you have.
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The resistors should control the threshold voltage of the LTC1440. How it should work is that the capacitor won't dicharge until it charges above the threshold.

The only reason the resistors are 1k right now is because I don't know how high I want the threshold to be yet.
 
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