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Topic: how to reduce the electrical noise (Read 2010 times) previous topic - next topic

paimpozhil

Hi MarkT,

Thanks for the answer,

To keep everything out of equation I disconnected all my PIRs and kept the arduino to the minimum.

I measured the voltage across the +5 and GND.. while the Flourascent light is flickering.

I saw voltage spikes upto 6 or 7 sometimes even more during this and hence the AtMega is restarting.. Is that possible?

Will atmega reboot when this happens?

I use the same wallwart to power the ULN2003 for  8 relays as well as the ATmega . will this cause Ground loop?


paimpozhil

I use a 7805 with 2x 470uF decoupling capacitors .. and I see more than 5V during the light flickers ..

Input is 12v from the wallwart which already has its own regulators. should i replace wallwart and try?

or should i change the voltage regulator IC to be something better than this?


paimpozhil

OK I have measured the voltage across my 12v wallwart lol it goes UPTO 35V during flickering.

I tried to replace my nokia phone charger and see what happens, it keeps its voltage stable..

I think the problem is my cheap crappy wallwart.. everyone agrees?


Grumpy_Mike

Yes it sounds like that is right. You could always get a zenner diode across the supply to try and clip any voltage spikes on the line.

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