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LCD Text Won't Display
Make sure the SDA and SCL are plugged in correctly.
If the text still won't display, adjust the contrast pot. The contrast pot can be found on the bottom, use a screwdriver to adjust it.
The final option is to download the hd44780 library. Open and run the example located under ioClass -> hd44780_I2Cexp -> I2CexpDiag. This sketch should identify what is wrong with the LCD display.
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If you don't know how to install a library, visit these websites:
https://www.arduino.cc/en/guide/libraries
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hd44780 library:
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