Dial Two

This is my third project in the “dial” series. See Dial One here.

With this project I wanted to try out a few design options, and I concentrated on those.

Though it is still far from a thing of beauty, the more minimal enclosure, featuring primarily the dial itself, was one thing I wanted to try. There was plenty of room for the electronics, and a nice big dial, but putting the power supply in the box seemed not possible. This is not necessarily a big problem, as the system also requires a sensor, or signal source box, and this could supply the power.

dial_two-20190430-88-cropped

The dial itself is irritatingly green, but in a more finished version, that board could be painted black. For the “featured” photo I adjusted the color balance to fade the green down.

16 steps

The other feature I wanted to try was a 16-step dial.

For this design I abandoned the idea of scanning the dial, which meant inventing a significantly different way to get the dial pattern to move around. Each step on the dial is on or off depending on a latch which stores that value for one cycle of 16 steps. Each latch gets its data from a common signal line, but the time when the data is transferred is different for each latch. In that way, the signal – which carries the pattern – can be time-delayed relative to the scanning pulses, thus updating the position of the “pointer” for every 16-step cycle.

Lights and Colors

To keep things simple, I used one circle of white LEDs. But this does not seem very aesthetically pleasing. I need to find colors that will work better. There is also no fading built into this design; the lights are either full on or full off. More control over light intensity seems desirable here. My next design will address these issues.

dial_two-20190430-98-slightly-lightened

This photo was made under very low-light conditions, then brightened slightly with digital manipulation. But this only slowed down the camera enough to show three lights on at once. I am considering making videos of my projects. That would give you a better idea of how they look “live.”

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