Arduino Fortuneteller

coffee-table   Sometimes I use the state of my coffee table as a kind of magic mirror through which I can glean some pretty powerful insights into my life–like how I desperately need more plano boxes.

  For week three of physical computing, I started noodling around with Arduino, and in keeping with the spirit of this weekend’s Maker Fair, I was inspired to play like a kid. Regression feels good. I was looking for a fun take on the Digital Input/Output lab, and I thought about the playground fortune teller, which was kind of a standby when I was in elementary school. The code is pretty simple:

A few things definitely went wrong. I originally had two parallel LED circuits on the breadboard, each reacting with their own digital input pin. The fortuneteller acted as a switch. When the aluminum foil contacts touched, it completed the circuit, setting the switchRed == HIGH and lighting the first group of LEDs. When it wasn’t HIGH, the other parallel circuit would complete. Digital input took me awhile because I have an impulse to want to connect it to ground. One thing that irks me is why there appears to be a lag with the LEDs. It takes awhile for the LEDs to turn off, three seconds after the contact stops.  I wonder if I’m not using the right components, or if the amps are so low in parallel that it takes longer for them to work their way through the circuit.

 

fortune

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1 Comment

  1. Benedetta

    This is wonderful! I am so glad that this material is starting to inspire ideas and projects! I am happy to help anytime! B_

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