resistors

Arduino Solar Cell Tester (2)

Arduino Solar Cell Tester

When I’m building Solar Shrubs and other solar-powered creations, I often scavenge cells from various off-the-shelf devices such as solar garden or security lights. But these cells are rarely labeled as to their voltage, current, and power output. So it’s off to my bread-boarding station. First, I put each cell under a lamp and connect it to my multimeter to get the volts. …

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toy piano

Convert a toy piano to work as a midi device and use it with Synthesia using Arduino

Goal of this project: Convert a cheap toy piano to work as a midi device and use it with Synthesia (http://www.synthesiagame.com/) Other programs that use midi inputs can also be used. Approach: The pushbuttons of the piano are used to make a simple pull-down circuit for the arduino mega. The arduino interprets the keystrokes and …

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Arduino Connect several digital inputs to one analog input

Connect several digital inputs to one analog input using Arduino

I often run out of digital pins on my Arduino. Anything as complicated as, say, a video game controller, was near impossible with the amount of pins I had available. Multiplexing buttons works, but it requires lots of connections and soldering. So, I put together a solution! Step 1: Resistor Dividers in Five In a …

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Servo Feedback

Servo Feedback Hack (free) Using Arduino

This Instructable brought to you by the kind folks a Rachel’s Electronics Visit  www.rachelselectronics.com  for cool electronics kits and breadouts! This hobby servo hack will add shaft position feedback by tapping into the servo’s own internal potentiometer. The only parts that need are wire and a little bit of solder, making this hack practically free. …

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