Sound and Movement | PComp #4

This week in Pcomp we looked into controlling sounds/speakers and servo motors with arduino. The first task in the lab was to control the pitch of a speaker depending on input from a variable resistor. I took the light meter I made last week and after some tweaking installed a speaker on the breadboard to provide an audio indicator along with the succession of lights. The pitch increases as the amount of light hitting the sensor increases. I was very surprised that the addition of the speaker only required a couple lines of code to be functional.

Video: Lightmeter + Audio

Screen Shot 2015-09-29 at 12.53.59 PM

The next task in the audio lab was to have the speaker play a melody. This required a library to be called in the Arduino IDE and the use of some arrays, which I don’t have much experience with. However I followed along with the lab closely and was able to get the melody playing on my arduino. The slight change I made from the lab was to assign different pins because I wanted to keep my light meter operational.

Video: Arduino melody

Screen Shot 2015-09-29 at 1.28.23 PM

And last up for the audio lab was to build an instrument. I had limited success here. I was able to get responsive tones from a few light sensors, however I also had a persistent buzzing tone that I couldn’t eliminate. I realized that part of this may be due to the fact that I am maintaining my light meter on the same board and that I may have unintentionally introduced some interference or error. I plan to attempt this again with a clean breadboard later this week.

Video: Arduino Instrument (Work in progress)


At this point I moved onto the servo lab and ended up successfully including a servo as another responsive element in my light meter.

Video: Arduino light meter + Sound + Servo

Screen Shot 2015-09-29 at 7.54.05 PM

I’ve been having a good time building around this light meter. I realize it’s fairly basic but I find it helpful to work with something thats somewhat familiar and somewhat new at the same time.

One thought to “Sound and Movement | PComp #4”

  1. With a couple weeks more, have you had time to return to the instrument? I’m curious to know if you discovered for sure what the problem was and how you solved it.

Leave a Reply

Your email address will not be published. Required fields are marked *