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Messages - fraryb

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Character LCDs / NHD-C0220BiZ-FSW-FBW-3V3M I2C not working.
« on: May 06, 2015, 08:53:00 AM »
Having problem getting display to respond to I2C commands.  Changed pullups over range from 27k down to 4.7k ohms and over 400kHz down to 10kHz without success. Can get response to enumeration query only when 3.3 volt supply is removed (open circuit).  Using generic I2C arduino code as well as that from datasheet.  Any help will be greatly appreciated.

Character LCDs / Re: NHD-0420D3Z-NSW-BBW-V3 back-light flickers
« on: May 06, 2015, 08:34:09 AM »
The LED back light requires a series resistor to limit current to 30mA or less as specified in the data sheet. The LEDs are probably overheating if you use a constant voltage rather than a constant current supply.  A 3.3 volt supply will not work.  Try 5.0 volts regulated with an 82 ohm resistor in series.

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