Enter the Arduino

Bike safety lights – Arduino switch from brett peterson on Vimeo.

This lab assignment was to make something using a digital switch connected to an Arduino. I thought of a system that would turn on lights attached to a bag when you put it on. I think if I were to do another iteration, I’d make it so you have to buckle the front straps ¬†of the backpack, because I really don’t want lights blinking every time I put on my bag.

Ketchup Switch

ketchup_switch from brett peterson on Vimeo.

For last week’s assignment we were asked to create a simple switch that, when closed, would turn on an LED. After watching my daughter spread food all over her highchair tray one night, I decided to try and use ketchup. Peep the video above for the results.

I wasn’t sure if the ketchup would conduct electricity at first, so I just decided to try it. I also found that the resistance of the ketchup was great enough that I could take the 220 Ohm resistor out of the circuit and still safely light the LED.