Getting Started with Adafruit Trinket by Mike Barela

Author:Mike Barela
Language: eng
Format: epub
Publisher: O'Reilly Media, Inc.
Published: 2014-10-15T00:00:00+00:00

Figure 5-36. The meter face for the hours display

Figure 5-37. The meter face for the minutes display

When designing and printing the meter faces, you can take precise measurements to get the correct needle sweeps, or you can obtain them via some trial and error. If the clock is not giving the correct reading near full scale, the faces reprinting or repositioning the faces instead of looking for a clock or code issue. Use a graphics editing program (Photoshop, GIMP, or many others) to shrink or expand the graphic to fit the same sweep as the original scale on each meter.

If you buy or salvage meters from old electrical equipment, it could lend a different look to the project. The meters may not be 50-microamp full scale, like the modern models, so some trial and error may be needed in finding how much current produces a full-scale reading. Be sure to not send any current through without large series resistors or perhaps a 500K potentiometer. You should use a multimeter to check the resistance.

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