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LED display via MCP23017

userHead Tonyf49 2022-04-20 16:17:52 1283 Views1 Replies

Hi

I have a 16x16 led display connected to my Arduino Uno via a MCP23017-based IO expansion board and a DFRobot Gravity: I2C Multiplexer.

My sketch displays an image perfectly (all leds lit constantly) when the LED unit is attached to Arduino Uno pins directly.

However, when I move the connection to the MCP23017, the image leds turn on and off repeatedly.

Any suggestions?

Regards

2022-04-22 00:45:36

Please provide extra power to the display.   As the MCP23017 maxium current may be not enough to power it.

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p.name Gravity: MCP23017 I2C 16 Digital IO Expansion Module DFR0626