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Topic: ethernet shield not working with another device plugged into the vcc port (Read 8 times) previous topic - next topic


My project has a seed studios ethernet shield attached to an UNO  and that connects to a relay breakout board. I have a power supply that converts 110v to 9v @ 1amp it has no problem powering the arduino and relay but when the network shield is attached the red light indicating connection on the Ethernet shield does not light up.... if I power the project from a usb it works fine but I would rather have my power supply running the project attached to ground and vcc. It seems when anything is attached to the vcc port the Ethernet shield will not connect but when I plug it in via usb and reset the project it works flawlessly. I thought it was just the vcc port but if i try to tap into the power port  instead I get the same issue... Any Ideas?


Your power supply is 9 volt at how many ma?

If you have a voltmeter, check the voltage on the Vin and 5v pins on the Uno.

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