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Piezo and LED Practice

After researching around, I found another useful tutorial on piezo elements at the Arduino website (Arduino Knock Tutorial).  Since our class just learned how to make LEDs blink using the Arduino (Thanks Todd!), I modified the code just a little bit to incorporate both the piezo knock and LED blinking light.

In the first part of this circuit, I attached my bare piezo disc (along with a 1 MΩ resistor to limit the voltage and current drops) to the analog input pin A0 and ground.  After, I wired up a 220Ω resistor from digital pin 13, along with a pink LED to ground.

Sadly, this third part was the most frustrating thing I’ve dealt with all day.  Apparently, when I tried to type “sensorReading = analogRead(knockSensor),” I needed to watch what my pinky finger actually pressed on the keyboard… is not the same as = and it took me nearly 20 minutes to catch that error!

After that tiny mishap, I verified the code and uploaded it to my Arduino.  Here is a screenshot of the code:


At first, I set the threshold to 100 and I realized that the piezo wasn’t as sensitive, as seen here with my kitten :3


So, I decided to change the threshold to 75 and it was successful.



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Piezos and Project Update

After reviewing in class this past Thursday, I learned that capacitive-touch and piezo-based-touch were two completely different things.  Oops..  So, I did more research on piezoelectricity and piezo discs (because I already have a few in hand) by researching through a few different websites and YouTube videos.  I tried to look in the Art of Electronics to see if I could find anything, but there wasn’t much.  I did, however, find the dictionary meaning of piezo.  The word is derived from the Greek language to mean “to press” or “to squeeze.”

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ETRO 296V Project

For my project this spring semester, I decided that I wanted to do some type of capacitive-touch drum kit or piano set and it eventually led to discussions about trying something out with MIDI.

I just learned how to program a “basic” key of C 8-octave piano keyboard with tactile buttons and a piezo buzzer with my Arduino (in the picture below), so it led me to look at the options of doing MIDI with the Arduino.  Here’s a link to the page:

I also found this Youtube video on MIDI (Collin’s Lab: MIDI) and it definitely helped explained the basic facts that I need to know and get started.