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Interference affecting RPi display

Posted: Sat Apr 28, 2018 11:57 am
by pi_lover
Hi,
My Raspberry Pi 2 is sitting on my bedroom. The strange thing is when someone switches our kitchen's light on/off the display of
the Pi goes black for a second and comes back on.
Can anyone explain what's happening here ?

Re: Interference affecting RPi display

Posted: Sat Apr 28, 2018 1:09 pm
by pi_lover
Any ideas ?

Re: Interference affecting RPi display

Posted: Sat Apr 28, 2018 1:42 pm
by pcmanbob
First off you need to give people a chance to see you post, as this is a peer to peer forum.

from the little information you have supplied not much anyone can say .

is it just the display turning off or the pi rebooting ?

in general if switching a light on in your house affects other electrical devices you might wan to get your house electrical wiring checked.

Re: Interference affecting RPi display

Posted: Sat Apr 28, 2018 1:47 pm
by pi_lover
Its just the display turning off. The Pi is not rebooting.
If any more information is needed please ask I will provide
them.

Re: Interference affecting RPi display

Posted: Sat Apr 28, 2018 2:05 pm
by B.Goode
If any more information is needed
My hunch is either some sort of radiated interference, or a problem with your house wiring.

Where is your bedroom relative to the kitchen? Above it, or at least in the same part of the building? Can you, at least temporarily, move the RPi to be as far as possible from the kitchen? Any change in behaviour?

What sort of light fitting does the kitchen have? Is it the sort of straight fluorescent tube that has a 'starter'? That might be 'noisy' in terms of electromagnetic radiation.

Is this the same RPi as the one you were running on an inadequate power supply?

Re: Interference affecting RPi display

Posted: Sat Apr 28, 2018 2:15 pm
by pi_lover
My bedroom is one room away meaning there is another room in between my bedroom and our kitchen.

I have already tried moving the Pi to another bedroom and connected it to a LED TV. Same thing happened there too.

Yes our kitchen has a straight fluorescent tube with a starter.

Yes its the Pi with a weak power supply.

Re: Interference affecting RPi display

Posted: Sat Apr 28, 2018 4:14 pm
by HawaiianPi
pi_lover wrote:
Sat Apr 28, 2018 2:15 pm
Yes its the Pi with a weak power supply.
It seems like you have just answered your own question. Get a better PSU. Preferably the official RPF power supply.

I'll go out on a limb here and also guess that you aren't using a good surge protector. Get one of those as well (one with line filtering - I like the Tripp Lite brand myself, particularly the Super7).

Re: Interference affecting RPi display

Posted: Sat Apr 28, 2018 4:21 pm
by pi_lover
HawaiianPi wrote:
Sat Apr 28, 2018 4:14 pm
pi_lover wrote:
Sat Apr 28, 2018 2:15 pm
Yes its the Pi with a weak power supply.
It seems like you have just answered your own question. Get a better PSU. Preferably the official RPF power supply.

I'll go out on a limb here and also guess that you aren't using a good surge protector. Get one of those as well (one with line filtering - I like the Tripp Lite brand myself, particularly the Super7).
Okay I will get a new power supply but cant get the official one coz
they dont ship to where I live. I have tosearch in amazon.in.

Re: Interference affecting RPi display

Posted: Sat Apr 28, 2018 4:40 pm
by B.Goode
I will get a new power supply but cant get the official one coz
they dont ship to where I live. I have tosearch in amazon.in.
You haven't put your location in your forum profile, but does that mean you want the power supply delivered to an address in India?

Because from https://www.raspberrypi.org/ I can select Buy a Raspberry PI (https://www.raspberrypi.org/products/) and scroll down to the official Power Supply and click on Buy Now. https://www.raspberrypi.org/products/#buy-now-modal Select your Country = India and there is a supplier apparently available -

https://www.silverlineelectronics.in/in ... aspberrypi

Re: Interference affecting RPi display

Posted: Sat Apr 28, 2018 5:01 pm
by pi_lover
Okay I will buy one soon. Thanks a lot.

Re: Interference affecting RPi display

Posted: Sat Apr 28, 2018 5:19 pm
by B.Goode
pi_lover wrote:
Sat Apr 28, 2018 5:01 pm
Okay I will buy one soon. Thanks a lot.
The idea from @hawaiianpi to use a surge protector is also worth considering if you are accepting the idea that the problem is being carried via the mains cabling.

The other possibility is that there is electromagnetic ( air-borne/wireless ) radiation from the switch or starter.

Re: Interference affecting RPi display

Posted: Sat Apr 28, 2018 5:54 pm
by pi_lover
Yes I am going to buy a surge protector too.

Re: Interference affecting RPi display

Posted: Sat Apr 28, 2018 7:54 pm
by HawaiianPi
pi_lover wrote:
Sat Apr 28, 2018 5:54 pm
Yes I am going to buy a surge protector too.
This thread reminded me of an old touch switch nightstand lamp that would turn on/off by itself whenever the air conditioner cycled.

While most people would not think a lamp needs one, connecting it to a surge protector exercised the demons from the haunted lamp. :lol: