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hamishcunningham / pi-tronics

Source code for Raspberry Pi GATE projects.
http://pi.gate.ac.uk/
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Rainbow Square #74

Closed marty-sullivan closed 7 years ago

marty-sullivan commented 8 years ago

Hi, I have this battery and it seems to power the MoPi OK at whatever voltage I set the DC output. The MoPi status also reports the correct input voltage from the battery. However, I regularly get the dreaded "Rainbow Square" from my Pi 2 whenever it is running, signifying under voltage from the MoPi. I don't have any usb devices plugged in, just HDMI display. Is there anything I should check in the config or otherwise?

hamishcunningham commented 8 years ago

hi Marty,

The battery should be ok; I'd recommend 12V if you're not using a second supply.

It is possible that your Pi is unusually fussy about the voltage -- MoPi's output is a fraction under 5V in order to allow directly connected supplies to overpower it. This doesn't create a problem in our experience.

Does the rig actually work normally?

HTH, Best

Hamish

On 9 February 2016 at 02:32, Marty Sullivan notifications@github.com wrote:

Hi, I have this battery http://www.amazon.com/gp/product/B011BGPUSI?psc=1&redirect=true&ref_=oh_aui_detailpage_o02_s00 and it seems to power the MoPi OK at whatever voltage I set the DC output. The MoPi status also reports the correct input voltage from the battery. However, I consistently get the dreaded "Rainbow Square" from my Pi 2 whenever it is running, signifying under voltage from the MoPi. I don't have any usb devices plugged in, just HDMI display. Is there anything I should check in the config or otherwise?

— Reply to this email directly or view it on GitHub https://github.com/hamishcunningham/pi-tronics/issues/74.

Hamish Cunningham Professor of Computer Science, University of Sheffield, UK +44 7920 765 455 hamish@gate.ac.uk https://twitter.com/@HCunningham https://hamish.gate.ac.uk http://aquaponicslab.org/ http://aquaponicslab.org/ https://gate.ac.uk https://pi.gate.ac.uk http://www.dcs.shef.ac.uk/cgi-bin/makeperson?H.Cunningham

marty-sullivan commented 8 years ago

Thanks for the info. Yes, the Pi seems to run normally. I can run things fine with the ARM at 400%, no voltage warning. It consistently warns me any time I do something that suddenly draws more power, but when running at full CPU for a length of time I get no warning.