We do what we must, because we can!
The Renard SS-16 Christmas Light Controller board comes equipped with an on board 5V supply. Having several high current 5V supplies on hand, I decided to use them, sparing the expense of the transformers, regulators, caps, diodes, etc.
Mostly Complete Renard SS-16
It turns out it is very easy to add a good old fashioned analog meter to your next digital microcontroller project. Simply, drive the meter with a PWM source with proper buffering and current limiting. This post will discuss the circuit theory, resistor calculations and programming necessary to achieve this end.
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