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Topic: The entire upper row of my LCD switches on without an output? (Read 35 times) previous topic - next topic

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I'm trying to make a thermometer using the LM35, an arduino and a 16x2 lcd but whenever I try and get an output on the lcd, the entire upper row turns on to form blocks. I randomly got the output once. I tried a basic hello world (https://www.arduino.cc/en/Tutorial/LiquidCrystalDisplay) and I have the same issue. I'll randomly get the output by adjusting the preset to 0 when turning on the arduino and then adjusting it to the maximum value.

9 times out of 10, I'll end up with all the lcd pixels lighting up.
imgur won't let me upload for some reason, but this is basically what I get : (https://www.google.co.in/search?q=arduino+16x2+lcd+problem&tbm=isch&imgil=yt-tYU-TaKZBiM%253A%253B95jA43osfTIxZM%253Bhttp%25253A%25252F%25252Fforum.arduino.cc%25252Findex.php%25253Ftopic%2525253D258616.0&source=iu&pf=m&fir=yt-tYU-TaKZBiM%253A%252C95jA43osfTIxZM%252C_&usg=__ypXg1tdkSlwPv_G1IVDkhi2yRaI%3D&biw=1163&bih=537&ved=0ahUKEwjO_vKJ_-LSAhVMrY8KHcLNCioQyjcILg&ei=X7LOWI7TCszavgTCm6vQAg#imgrc=yt-tYU-TaKZBiM).

My LCD module is an RG1602A and I'm using a 10k preset for contrast. Thanks!

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