Need an EE

[browncoat]

or at least someone with a bit more knowledge than I.

I built the backatronics pwm from this thread:
https://www.homebrewtalk.com/f170/pwm-show-us-how-221301/

Everything is working, have the led indicator light flashing on the ssr. I would like to put this in my panel:
http://www.adafruit.com/products/252

With the directions on the site, I added 240Kohms in line with the meter, they said 20,000 * voltage (12v) which gives me 240,000 ohms. It shows the pwm signal just fine. I would like to average out the pulses so that it just gives me a quick look at about the average output. How do I do this?

I'm assuming I need a capacitor somewhere, but I don't know where nor what size. Can anyone help?

 

[huntb]

http://provideyourown.com/2011/analogwrite-convert-pwm-to-voltage/

Scroll down to the "Low Pass Filtering" section to get a brief understanding of how it works. There is also a link to a calculator that you can use to filter your PWM