Try to use the Arduino Yun with the Ideal power 9V

Submitted by Guest on Tue, 24/03/2015 - 16:41

Hello all !

I used the "how to build an arduino energy monitor page" with my arduino uno and it worked perfectly to monitor power of various equipments.

Now i just change my Uno to a Yun with exactly the same configuration and....nothing happen.

It seems that the Yun has no power. All LED are OFF.

I use a power adapter "Ideal Power 9V" .

Any idea of the issue ?

Re: Try to use the Arduino Yun with the Ideal power 9V

Submitted by Robert Wall on Tue, 24/03/2015 - 17:37.

Is the Ideal adapter the only source of power for your Arduino board?

The ac adapter can be the only source of power ONLY for the emonTx V3. For all other implementations, you will need a separate dc power supply to power the board, exactly like you did with the Arduino Uno. Have you got the correct 5 V dc power supply connected and working?

Re: Try to use the Arduino Yun with the Ideal power 9V

Submitted by rodrigueb (not verified) on Tue, 24/03/2015 - 20:33.

Hello,

Thanks for your help !

Exact, i didnt know that another alimentation was needed and yes for the uno i was connected to it through usb so i guess the additional alimentation was through this usb.

Definitively impossible to use only one power supply? even with some kind of other electronics ,like on emontxv3?

Re: Try to use the Arduino Yun with the Ideal power 9V

Submitted by Robert Wall on Tue, 24/03/2015 - 21:02.

I have not done the calculations, but with the comparatively very high current demanded by the Ethernet connection and two processors, I believe it is definitely impossible to use the ac adapter as a power supply. Doing so will greatly distort the voltage wave so that using it for measuring would mean nothing. It was very difficult to design the emonTx V3 power supply so that there was enough current to operate the processor, the RFM12B radio and one temperature sensor, without distorting the voltage wave. There is not enough current to operate the RFM69CW radio over the full supply voltage range given components that together are all at the worst-case end of their tolerance range.

Re: Try to use the Arduino Yun with the Ideal power 9V

Submitted by dBC on Tue, 24/03/2015 - 21:22.

There are some power numbers for the Yun here:

http://playground.arduino.cc/Hardware/Yun#power_consumption

Re: Try to use the Arduino Yun with the Ideal power 9V

Submitted by Robert Wall on Tue, 24/03/2015 - 21:41.

I thought so. That's well over 10 × the emonTx V3 current.

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