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alphanumeric hex display/feather pinout question
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alphanumeric hex display/feather pinout question

by tmslaton on Fri Jul 24, 2020 9:04 pm

Hi, I am building a mirror that displays scrolling inspirational quotes as a conversation piece/inspiration for my engineering lab classroom.

You were out of the the alphanumeric hexadecimal displays with the I2C backpack. I noted that the feather alphanumeric hex display used the same chip so I got those instead. The non-feather version have 5 pins, SDA, SCL, Vcc, gnd and Vi2c. The feather version pinout only specifies a power, gnd and SDA, SCL pins. I am assuming that the feather version is getting the Vi2c power from its connection to the feather. If I am not using it with a feather, but with a uno or a nodeMCU. which pin on the feather backpack corresponds to Vi2c?

Thanks,
Tania

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Re: alphanumeric hex display/feather pinout question

by dastels on Fri Jul 24, 2020 9:59 pm

The Vi2c is only used to power the pullup resistors. Connect it to 5v on an UNO as the UNO uses 5v logic. If you're using it with a 3v board, connect it to 3v.

Dave

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Please be positive and constructive with your questions and comments.