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emonTX at 4 Mhz

Submitted by Guest on Sat, 02/06/2012 - 20:36

Hello!

Has anyone tried running emonTx by setting the atmega clock prescaler so that the microcontroller runs at 4 MHz? I am trying to reduce the current consumption (to increase battery life) and could do some basic tests already. I set the ADC clock prescaler to 16 (from the default 128) and then the measurements (VI calculation) seemed to work correctly.

Cheers

 

Ganesh

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mharizanov's picture

Re: emonTX at 4 Mhz

Submitted by mharizanov on Sun, 03/06/2012 - 14:34.

Will the RFM12b work at 4Mhz?

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ganesh's picture

Re: emonTX at 4 Mhz

Submitted by ganesh (not verified) on Thu, 07/06/2012 - 07:43.

Hi all,

Just an update on my experiments. The emontx and power measurement algorithm plus rfm12b transmisson does work at 4 MHz. But, as expected, there is deterioration in the number of samples per wavelength and hence the accuracy is affected. I have a set of detailed measurements and statistics as part of an academic project - if anyone is interested,  I would be glad to share. However, I was unable to get the RFM12 B working when the arduino was prescaled down to 2 MHz.

Cheers

Ganesh

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