Update iv-18

Sometimes you need a little time to search for a better solution. I changed the power supply. And now, we need only 5V voltage as input voltage, no 12V voltage are necessary.
It’s possible to operate the DC-to-DC step up converter with 5V voltage as input voltage too. ***smile***

20151129_133226

This is the result … This is the result … with a provisional box.

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