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20x4 Alphanumeric serial (I²C) LCD module with blue backlight A 20x4 alphanumeric LCD module with blue backlight, supplied with an I²C driver module which may already be soldered to the display. With it in place, you can update the characters on the display over an I²C bus. For more details, see the El Cheapo Asian Electronic Modules article in the March 2017 issue.
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