Go Down

Topic: how to reduce the electrical noise (Read 5187 times) previous topic - next topic


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?


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?


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?


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.

Go Up

Please enter a valid email to subscribe

Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

via Egeo 16
Torino, 10131