Arduino PWM Fun

[sopues]

You should probably do some gamma correction on those pwm levels :)

[Grundalizer]

what's PWM?

[kd1s]

@Grundalizer

It is Pulse Width Modulation.

[rtty21]

"LED" is usually enunciated as "ell-ee-dee". just say the letters L, E, and D.

I'm not trying to be an asshole, but most people don't enunciate LED as you do.

again, I don't want to come off as snobby or ass-hole-ish.

regards, rtty

[chickenpoper]

@rtty21 I usually say L.E.D. but sometimes i just like to say led, sorry it just makes it seems easier to say it like that and it just feels more natural that way.

[missle3944]

u sound like kevin from the office

[unromeo21]

that is called a duty cycle ! it varies from 0 to 100% ..

[glyph000]

Change vert. sensitivity to give larger vert. size to the signal.

Adjust trigger (try "Auto) and change the "Level" until the signal stabilizes.

Should give you a stable display.

(FWIW: it's "L-E-D", not "lead". ;-) )

[kd1s]

@glyph000

L-E-D or Lead who cares. If you're gonna nitpick try someone who gives a fuck.

[dlmarti]

Turn off the DC filter on the O-Scope, it dramatizes the PWM display.

[smeezekitty]

What happens if you connect the PWM out to a 1K resistor to a 10uf-100uf cap with a 10k resistor across it on the scope?

Technically it should be a smooth sine up and down.

[kd1s]

@smeezekitty

Hmm, I'l have to try that. Thanks!

[dodgedart74]

keep the big scope. it'll last through a war.

[TCCHowie]

script kitty

[HayateGekko973]

I spaced out for a moment....(Hmmm..did I play this on Atari)?

[orion1077]

As far as I know, the pulse is not supposed to be "traveling" like that. It should change it's width only. I think it's the sync of your scope (play with the scope's trig. level a little bit)

[wickedbadretard]

hey I wanna check out your code. you have it posted on the forums or anything?

[Grundalizer]

haha, I thought you said, "hey I wanna check out your chode"

[tckotb]

@wickedbadretard just set the pulse widths to oscillate with for loops

[Amishman35]

Did a bratty child put string in the motor of your fan? It sounds like it's putting out 73 dB SPL. Probe a speaker with the scope and make a video of the oscilloscope displaying the sound level with the fan off and on. I'm thinking you'd have to change the volts/div many times...

[cfavreau]

You may want to setup your trigger on your scope so the waveform does not walk. although the walking is kind of neat...

[nulleth]

So exciting I nearly fell down.

[jorge10206]

Made that experiment to hah

[Skylord12345]

now if i could understand this would make sense, To bad i don't

[kd1s]

It's fairly simple. The Arduino (or BBB) emits a pulse and the oscilloscope shows voltage or current over time.