Pin interference

Hi,
New to this forum so I hope this is the correct place to ask for help.
I have searched, both inside and outside of this forum but can't find anything to help me.

My setup is located in my car

My problem is that I have a HAM-radio close to the arduino ( about 50cm) and when I set the radio to transmit at >30W, one or more pins on the arduino goes high and triggering my system.

I have a pulldown resistor at 10K on each pin but that doesn't help.

Is there a way for me to shield the arduino from this interference?

The systems share a 12V-line but have there own grounds to the battery.

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0 jw0752 over 9 years ago

Hi Niclas,
It would be a good idea to have a decoupling capacitor on the power wire close to the arduino, Also you can try using shielded cable on your input lines to the arduino. Depending on the sensors or inputs of your system you could also try lowering your pull down resistors and put decoupling capacitors on the inputs as well.
John
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0 jw0752 over 9 years ago

Hi Niclas,
It would be a good idea to have a decoupling capacitor on the power wire close to the arduino, Also you can try using shielded cable on your input lines to the arduino. Depending on the sensors or inputs of your system you could also try lowering your pull down resistors and put decoupling capacitors on the inputs as well.
John
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