#SAFE CURRENT FOR ARDUINO PIEZO SERIAL#
Serial.begin( 250000 ) // as fast as it can be, change Serial Monitor to matchĭelay(50) // it will now show almost 20 reads a second int piezoPin = A0 // the number of the input pin With those we have step one in converting the data into different midi sound triggers. This sketch will show the raw reads at about 20 per second just to give ballpark data figures. The led is good but your eyes are too slow to see it flicker faster than 24x a second. Int previous = LOW // the previous reading from the input pin Int reading // the current reading from the input pin Int state = HIGH // the current state of the output pin Int LED = 13 // the number of the output pin
#SAFE CURRENT FOR ARDUINO PIEZO CODE#
Here is my code again: int piezoPin = A0 // the number of the input pin This is why I thought that using a LED light as a test would be better because if it would turn on and right back off that would act more like a switch. It chooses randomly between 3 different audio files to play. I know the WAV board is setup correctly because when a switch is connected, instead of the Uno, it works perfectly. The problem is, it's triggering all the sounds on the board instead of one. The WAV board is also getting a signal and triggering the sound. The Piezo sensor part of this code is working fine. I was trying to just us the LED light as a test, but it seemed to add some confusion and perhaps over complicated things.Īll I really want to do is send a signal to a WAV Trigger board when the Piezo sensor detects a signal. It's extreme, the piezo picks up ants stepping on it. You can amplify the piezo output, changing voltage to current to make pin-safe input. That was with 5V through a 2.2K resistor feeding the transistor, the resistor "tunes" the sensitivity of that circuit. Arduino can read that pin 50,000 times per second, a hard smack with a screwdriver handle would take about 2000 reads while a very soft touch took about 20. The pin went HIGH, reading the pin over and over drained the charge to LOW and the number of reads told me how hard I hit the piezo. In my experiments I had the transistor feed current to a wire connected to a digital pin. The piezo will open the gate for time equal to how hard it is flexed. Try feeding your piezo output to an NPN transistor gate. You can run your PC without a ground too if you like replacing parts every week or two.
A few times, 100 times, the possible damage might not be noticed. Piezo hit or tapped directly can make spikes I wouldn't put on my Arduino pins. If you have a threshold, it will be in that range, it's not as if determining volts is your goal is it? Why go through the waste of cycles converting analog read 0 to 1023 to anything else?
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