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I was shocked when I saw this Volt Meter Style Clock, it is close to a design that is sitting on my bench right now! My design should be done in 2 or 3 weeks. I love the minimal parts count of this project, since it is battery powered there is no power regulation section and that helps keep the circuit nice and simple. If you want to make your own code and schematics are available. Via: Hack a Day “The clock is patterned after an analog voltmeter. The meter pointer indicates the time on a meter scale marked in hours, with quarter divisions indicated. The pointer, driven by a servo motor, starts at 12 o’clock on the left, ending at 12 o’clock on the right. The meter pointer travels slowly to the right, indicating the current time. At 12 o’clock, the pointer rapidly transverses from right to left, restarting the process. The clock runs on a PIC18F1320 (which I happened to have), hand-assembled on a pref board. A picture of the board and a schematic are shown below. Most PIC 18F series will work for this circuit - a proto-board with an 18F452 was used for code development, The two buttons are for setting the time. Because the servo has its own internal electronics, it has 3 connections for control signal, power and ground. No high-current drivers are needed by the circuit.”
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January 17th, 2010
[...] via hackaday, hackedgadgets [...]
January 18th, 2010
Neat, thanks for posting this. I took a look at the schematic, and I’ll admit to being a bit surprised … isn’t running a microcontroller off the same supply as an R/C servo considered a no-no because of the noise? Or are Pics particularly noise-resistant?
January 18th, 2010
nooooou that was my idea, you s.o.a.**.. haha, whatever. Nice work
January 18th, 2010
Hi Len,
I have driven servos in the same method and have not had any issues as long as the .1uF cap is electrically close to the microcontroller power pins.
January 18th, 2010
AM PM?
January 24th, 2010
Thanks, Alan. It looks like the standard Arduino Duemilanove has that covered then, at least if I’m reading the official schematic correctly.