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Why are you not using a low power LCD display? I am using some from Newhaven like the NHD-0216K1Z-FSB-FBW (blue), and it's an FSTN so display is black and not "grey", and at full power the LED takes only 20mA so I can drive it directly from a pin of the AVR, no transistor, no resistor (it's built in the LCD to drop to 4.2V max).
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2013 Hyundai Sonata Hybrid
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