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Messages - CarloTruax

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Character LCDs / Re: 2x NHD-0420D3Z I2C Problem
« on: September 16, 2016, 11:43:29 AM »
Hi...i am a new user here. I want to know how are the displays powered?Is there a separate 5V input for the VDD on either display. Also are you using any pull up resistors? Are there any other devices on the I2C bus?Last time I heard an issue like this occur; another device on the bus was keeping the logic voltage from reaching a valid logic High for the display.

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