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how to prevent voltage/power drop to arduino when AC compressor kicks in

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how to prevent voltage/power drop to arduino when AC compressor kicks in

My Electrical question:

 

Background:

 

House furnace fan power supplies 120 VAC to my attic 120 VAC AC in line duct fans.  

 

I have a micro controller (Arduino) which controls two dampers in the attic to redirect the air flow to either the two bedrooms OR the hall and bathroom.

 

https://www.arduino.cc/en/main/arduinoBoardUno

 

The arduino, damper power, and optically isolated relay power come from this circuit.

 

I have put a receptical on the 120 VAC line to provide power to the system.

 

The Arduino is powered by a 9V DC 650 mA plug in power supply plugged into the receptical.

The optically isolated relays are powered by 5V DC plug in power supply plugged into the receptical.

The electric dampers are powered by a 24 VAC plug in power supply plugged into the receptical.

 

Works great.  The arduino cycles the two dampers every 30 minutes as long as there is 120 VAC coming from the furnace fan.

 

 

Problem:

 

When the AC compressor kicks in there appears to be a voltage drop resulting in the arduino rebooting.  Equivalent to powering down the arduino and then powering it backup.  I have observed this first hand when the AC compressor kicks in.  The reboot is instantaneous.

 

 

Solution:

 

Can I put a capacitor across the 9V DC leads into the arduino to mitigate the momentary voltage drop?  What kind and type of capacitor (assuming I know what I am doing) do I need.

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HELP!!!!!!!!

asked May 2 by john_armsby (120 points)

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