i have a 10k potentiometer set up with an arduino micro :
• pot + terminal is connected to the +5v rail, which is connected to the arduino micro 5v pin
• pot - terminal is connected to the shared ground rail (connected to arduino ground)
• pot signal terminal is connected to arduino A0 pin, with a 100nF capacitor between the signal and ground (for signal cleanup)
this reads cleanly into the arduino serial monitor on my laptop if i sweep the pot knob, i’m software-filtering so only value changes greater than 5 are captured.
as soon as i connect the wav trigger 5Vin pin to the shared 5v rail, i get signal chatter in the serial monitor, value changes up to 40 or so all of a sudden in a constant, random stream. pulling the wav trigger 5v connection from the +5v rail stops the chatter.
do i need to insert a diode or something to isolate/separate the 5v to the wav trigger? why am i getting this chatter? was really hoping to power the wav trigger via the arduino/shared rail for my project…
also, this is all powered via USB into the arduino. i suppose another option would be to cut into the usb wire before it reaches the arduino and split out the +5v to feed the arduino and the wav trigger, but would be much more elegant to use the 5v from the arduino.
just like i said in original post: value changes up to 40 or so all of a sudden in a constant, random stream. pulling the wav trigger 5v connection from the +5v rail stops the chatter.
YellowDog:
What are you using as a power source?
laptop USB. will be 1-2A wall wart adapter for final version.
YellowDog:
How much current can your power source supply?
from laptop, 500mA. i believe that is plenty for arduino micro and wav trigger (no amp/speaker driving from w.t.).
i have taken an alternate approach that seems to be working for me in it’s current state, though i don’t yet know why. i am running the USB from laptop into a breakout board, from there jumping all of the USB cable wires to another cut USB cable running into the arduino, with the power split at the breakout board and jumped to the wav trigger. i now have none of the previous noise with one or more pots connected as before to the arduino/rails.
