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Topic: LCD won't Connect With 10K potentialmeter? (Read 115 times) previous topic - next topic

Jasmine999

Hello,

I am currently trying to connect a LCD from Adafruit to an Arduino Uno. When I connect the 10K potentialmeter to the 5V the LCD backlight turns off. I tried with several 10K ones but all had the same result. Help???

Link: https://www.amazon.com/gp/product/B01GQFVRCM/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1

Paul__B

You have something connected to ground that should not be.  Possibly you have confused the potentiometer pin for the wiper with the pin for the ground connection.

For a start, connecting the potentiometer to 5 V is actually a bad blunder which has been propagated from one ill-conceived "tutorial" to another for many years now.  It absolutely should not be connected to 5 V in any case.  Not connecting it makes setting contrast twice as easy (even easier of you use a 1k potentiometer instead) and saves an unnecessary current drain.

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