Piezo film + 7-segment display

[dimitrive]

Hi all,
I am new and this is my 1st thread. . I have interfaced a counter circuit to read a signal from a piezo film to 7-segment display. Idea is to count multiple tapping of piezo film. Meaning, every bend, counter should to count up. I have no issue with the counter circuit. But, my piezo driver circuit did not manage to give proper signal to my clock counter input. Eg.The counts jumps from 1 to 6 or 3 to 8. I believe I may need have to modify the driver circuit. When I connect an LED to output, there is signal. Maximum voltage when I tap should be around 0.7V. Meanwhile I need, 0V clock input. I did connect to transistor to invert proper signal but failed. I did also add amplfier circuit and failed too. I am afaid this analogue signal is not strong.
I just want it to count up when the piezo film is bend to certain (controllable) extend/stress. Please have look at the attached pictures for your reference. Let me know if any idea. Appreciate any reply! Thank you.

 

[jpanhalt]

Could it be that everything is working properly, and what you are seeing is the equivalent of switch bounce?

Do you have a controlled way to flex the sensor? Have you tried a debouncer? Some debouncers, such as those based on monostables like the 555, allow setting the re-trigger window.

John

 

[dimitrive]

Hi,
Thanks for ur reply. Maybe u r right. I will try using the debouncer circuit. Thanks.

 

[sanarota]

clear film-like substance

What is the clear film-like substance that forms when you fry an egg? I also have a rice steamer, and this also happens to the rice (white) on the bottom after cooking. Would that be the starch and water frying?
The two film-like substances from egg and rice are nearly identical in texture and appearance, are they the same?