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Last update: Mon Oct 15 22:56:20 2018
So, it will be like that :
In fact the voltmeter are easy to drive with a 1kOhm in serial and PWM. No algorithm inside, I made just a simple measurements and stored in the EEPROM the calibrated values for each hours or 10's minutes. I'd do a simple ratio for minutes. My only concern is that the voltmeter I got now are using a spring to push the arrow back to zero (and therefore subject to stress and losing it strength), whereas previous I bought a few months ago where using a magnet. Let's see, but I forecast that periodic re-calibration will be necessary.
Source SVG file : voltmeter-scale-time12.svg
This will be powered by a ATtiny10, an extra small micro controller of barely 3mm x 3mm. This was just a pretext to practice with this little IC, and seeing the limited number of pins, blinking led is what I'll use it for (though some people put USB stack on it ...!).
Code is here at Google code, in the project ArdReveil4Effects. Points of interrest:
%20-\/-%20 Flame PB0 |o | PB3 GND | | VCC Led pin PB1 |____| PB2 Led pin
Google source control (you can pick the tag ARDREVEIL4_VOLTMETER_20141207)
Things to know:
Points of interrest in the code:
The enclosure in preparation: a piece of wood at the bottom, the top is the aluminium shielding of a big power circuit of a thing I attempted (but failed) to repair, you see also a tube that will be plugged in the stuff, as well as one of the voltmeter. The thin steel pipe is the body of my former iron, and I always knew I could reuse this baby for design ... just wait, you'll see.
First holes for the voltmeters and the chimney (you'll see)
Just a quick preview of what it will look like. Still need to make the hole for the tube.
Attiny10 part done and wired inside the aluminium shielding
Nearly finished, need a couple more leds and plug in the voltmeters for real
Finished product. Managed to take the picture with the angle of the protective plastic cover just right on the figures (sigh... oh well).
The insides of the beast: on the left a atmega328 on its WordClock v1.0 board
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