OpenSprinkler › Forums › Hardware Questions › DIY Kit Assembly Questions › Contrast on LCD › Re: Re: Contrast on LCD December 31, 2012 at 4:37 am #23273 RayKeymaster Make sure your RLED is 100 ohm. There many resistors in the kit but there is only one that’s 100 ohm. If it’s correct, please measure the voltage between LCD’s VO pin (3rd pin from the left) and GND (1st pin). Let me know the voltage reading.
