Jonathan,

This variable brightness vs lit area issue is true of any display in which you can only light one segment at a time. My scope clock has the same issue.

The cure is to run the refresh routine a fixed number of times per second. Use millis() to make a time period.

My friend Tom Jennings teaches art school students how to use Arduinos, so he's building up a very nice curriculum. Here's his page about making timing loops with millis():

http://sensitiveresearch.com/code/fastCode/index.html


On 2/16/16 10:08 AM, Jonathan F. wrote:
Thanks! This is now running by an arduino.

But... I detected that if the scale is about 1/4 lighted , its much more
brighter then when its fully lighted.
Of course, this is caused of the duty-cycle.
Anyway how to fix this?



--
David Forbes, Tucson AZ

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