I connected 16 piezo to mux cd74hc4067 with 1Mohm resistors connected beetween Input of mux and gnd.
But the mux not works. The problem is: i set the selector of mux to 0000 to select channel 0, but if i touch the piezo connected on channel 1 (or other), it produces result. Why?
Help me please!!!!
Where are the links to your components and where is the picture of your circuit (schematics is OK)?
Ok this is the datasheet of multiplexer: http://www.ti.com/lit/ds/schs209c/schs209c.pdf
this is datasheet of piezo: http://docs-europe.electrocomponents.com/webdocs/0f2a/0900766b80f2a584.pdf
and i attached the schematic used from me
Please post the code you use. And use code tags to avoid the forum systems manipulates it.
I would never connect a piezo directly to a TTL input. To my knowledge piezos can generate quite high voltages for a short time. As far as I know you need an OpAmp to get a strong enough signal for an MCU to detect. But I'm not the piezo specialist.
I resolve using a zeneer of 5.1 V
Thanks