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Interfacing a 4 voltage level digital signal and an Arduino

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Brumby:
Here is a video I did showing it in use.  (I'm not a presenter - so be kind.)

Brumby:

--- Quote from: Chemist_Guy on December 30, 2019, 01:48:53 am ---(It runs off 2 AA batteries, hence the 3 V max)

--- End quote ---
Certainly two AA batteries will put the voltage into the realm of 3V - but in my last project, I tested operation over a range of supply voltages from 3.3V down to 2.7V.

What I found was that the LCD signals remained unchanged at 1V, 2V and 3V - so there is a little buck/boost regulation going on in there.  Mind you, for the current required for an LCD display, that isn't a big ask.  I suspect this will be a common approach in LCD drivers.

I was tempted to run the scale directly off the 3.3V available from the Arduino, but I went for the LDO regulator running off the 5V USB supply.  Without a datasheet on the scale's chip on board, I felt it safer to go that extra step - especially as the units were headed to the other side of the world.

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