A project I am working on requires temperature data to be sent periodically (about every 5 minutes) from a sensor node to a data logger using an XBee radio. The project requires the sensor to operate using battery power for two weeks. To conserve power, I built a 3.3 V breadboard Arduino with a efficient

For a recent project I used a a TSL235R light-to-frequency converter that outputs a square-wave signal with a frequency that increases the amount of light hitting the sensor also increases. There are several Arduino packages out there for using the ATmega328 to measure frequency but I decided to write my own code in order to

Update: I’ve made new versions of these warning stickers using white lettering on a red background to conform more completely with local fire and electrical codes. Follow this link to see the updated warning stickers. Click the image at left or any of the images below to be redirected to my CafePress store to purchase

In order to display text in a processing applet or sketch, one needs to first create a font to use with your sketch. Select Tools > Create Font… from the menu. The dialogue box shown below will appear (Mac OS X version of IDE) select the font and font size and specify the name of

As a physics professor, I’ve discovered that there is one thing more than any other that prevents students from finding success in my algebra-based college physics course, proficiency in algebra. Students who start the course without sufficient mastery of algebra are like students starting a English literature course without being able to read English. If