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I understand that the signals from my microcontroller may have 2,5 up to 15 Volt – independet of the voltage used for the display module. Is this correct?

April 26, 2017display independet microcontroller signals understand Used Volt voltage

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I understand that the signals from my microcontroller may have 2,5 up to 15 Volt – independet of the voltage used for the display module. Is this correct?

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Exactly – you do not have to take care of this. The signals of your microcontroller are 100% decoupled of the voltage of the display module. Just connect it, no matter what voltage you are using.