I had a little fun with a stepper motor this week. Thought I'd share it here... these things are pretty cool to experiment with as generators. If you get inspired, share your experiment in the Hack A Week thread.
In response to the Hack A Day post in which they asked for a someone to fill a position on their staff as a designer and builder of projects... for #30K a year in Santa Monica... I decided to create "Hack A Week"! This is no April Fool's day joke, it's real. I'll be posting one project a week for at least the next year! Big challenge yes, but also lots of fun! Stop in and see the first project for April Fool's day, "Screaming Altoids".
Here's a fun project to make with the 555 chip. It can be built as a stand alone circuit or you can put it inside a doll, toy or whatever! I'm entering this one in the 555 Contest in the Art category.
Here's how it works. When it's turned on, the 555 astable oscillators are activated. One will produce a high pitch squeal through the speaker and the other will blink the LED about twice per second. When you shield the photo cells from light, the frequency of the sound will decrease and the LED will blink slower. If you arrange the photo cells so that they are near the LED, some of the light from the LED will be reflected off whatever is shielding the photo cell. The photo cell will react to the light and raise the frequency while the LED is on, then go back to where it was when the LED is off. See the video below for a demonstration.
I've posted this one elsewhere but it's a work in progress so I figured I'd share it here. I spent about four hours today reworking the schematic and the next step is to make a PCB, solder up the components to it and get it in a new larger enclosure. I'll probably do another video of the PCB build because I'll be using the Laser printer technique with a twist of my own involved.