Capacitor discharge circuit

RE: Capacitor discharge circuit

MartinBL — Fri, 02 Feb 2018 15:22:05 GMT

Yes, an overvoltage could potentially damage your controller. A few solutions are discussed here: Piezoelectric Sensor and the ADC.

RE: Capacitor discharge circuit

Faizan — Fri, 02 Feb 2018 07:56:34 GMT

I am taking two data simultaneously which is Gyro an piezo data.

I have one more question piezo element is convert mechanical energy to electrical energy so it has to generate energy or voltage as output. In my case i have directly connected piezo with ARM cortex gpio pin. So my question is generated energy or voltage throw piezo is goes into controller or somewhere else ?

RE: Capacitor discharge circuit

MartinBL — Mon, 29 Jan 2018 14:36:46 GMT

There are literally thousands of reason why a controller might shut down.

You need to debug your code to see if there might be something in your firmware that doesn't work.
Maybe you can remove your piezo sensor and see if that helps. If it does you should start looking at voltages etc.
How long does it take before the controller shuts down?
Is the controller or piezo doing anything special when it shuts down?

RE: Capacitor discharge circuit

Faizan — Mon, 29 Jan 2018 10:28:24 GMT

are you absolutely sure the piezo element is the reason why your controller shuts down?

No, i am not sure about this . may be due to some other reason controller get shuts down. But just i assume that piezo is one of the problem for shuts down the controller. Can you suggest me the possibilitys of shuts down the controller ?

RE: Capacitor discharge circuit

MartinBL — Mon, 29 Jan 2018 10:09:10 GMT

Accoring to wikipedia a piezo sensor can be modeled like this. So it is a little more advanced than just a capacitor.

You should read the datasheet of your particular sensor and figure out what the maximum voltage you can expect is.

And are you absolutely sure the piezo element is the reason why your controller shuts down?