Arduino Basics Digital to Analog Conversion

[@random_Person347]

You didn't post the Arduino code though, but I tracked it down on Amanda's project page.

[@robertcalkjr.8325]

Thanks Paul. I haven't played with my Arduino in years. I prefer analog circuits.

[@learnelectronics]

I'm an analog guy from way back to the 80's

[@robertcalkjr.8325]

Analog circuits just seem to run smoother and LED's look warmer. I have 2 Night Rider KITT's with 6 LED's; one with analog components, and one with the Arduino. The analog LED's just look warmer and smoother.

[@arthursgarage6550]

analog is fun but it is a lot harder than digital in my experience

[@katongekai]

sir can i give it the 8 dip switch before it goes to resistor to control output?

[@JeremyCook]

Thanks for the video. From a practical standpoint, what is the advantage of an R2R ladder over straight PWM. For that matter, is there a reason you'd want to use this over a setup using a PMW output and a filtering capacitor?

[@arthursgarage6550]

I could be wrong but from what I remember pwm is just a square wave from 0 Volts to 5 Volts that are pulsed at just the right times to average at a certain voltage which in something like an audio amp can sound annoying while R2R ladder gives a constant voltage output

[@JeremyCook]

@@arthursgarage6550 Thanks!

[@jawherferid1604]

great video ! how much is the capacitor in farad ??

[@arthursgarage6550]

100nf

[@hyprballads]

It's not R square 2, it's just 2xR Hence the 22k 47k

[@videosajjee3892]

How to get 8 lines per octapad...?

[@3dgiftz]

Super

[@luckybambooguy6084]

nice video explained well... not too long winded... good video and audio... A+++++ I hadn't thought of this problem but now I'm thinking how I can use this in my projects.... Thanks Much

[@learnelectronics]

LuckyBambooGuy thank you.

[@fakiirification]

just when i was wondering how to get a true AC sinewave out of my arduino! Any idea how much current this can handle? I need to drive a very small step up transformer to make something like a 50-60 volt by a few milliamp "signal" for lack of a better word. maybe use the arduino outputs to drive transistors feeding into the resistor network? or maybe an op-amp IC to feed in. idk! off to experiment!

[@bradclymer3191]

Really useful, thanks!

[@Bob3519]

This was neat. Thanks for sharing this.

[@Dom-bo8wd]

any ideas how to change the frequency?

[@vicplasma58]

changing the value of "delaymicroseconds(50)" at 5:40

[@fredlllll]

i wonder why noone made an IC with such a resistor network yet... would be the counterpart to a flashADC

[@learnelectronics]

There are DAC IC's. They probably use an R2R ladder. They definitely have a buffer and an amplifier.

[@fredlllll]

i guess they are rather using a class d circuit, otherwise they wouldnt be so ridiculusly expensive sometimes :P

[@learnelectronics]

fredlllll true. I'm going to do a video on how to use a dual op amp to create a buffer and amplifier for the r2r ladder in a few days.

[@fredlllll]

cool :)

[@tonysfun]

Very nice, I'm now a subscriber also! Thanks and you can also mention what equipment you are using in your videos, for some of us that is also interesting.

[@learnelectronics]

Tony Fleming thanks for subscribing 😀 by equipment, do you mean scope? it's a Hantek 6022BE right now... but that is going to change this week.

[@tonysfun]

Yes, I would like (in most cases) the person, who does uses tools during the video, to at least have a model number and name of the equipment used. I know, most people don't care that much, but I like that kind of details. Thanks for the answer and if you like, post here your new scope and or even a video, I love to see what NEW TOYS you have!

[@marianabalog2144]

I care!! I like to know it also thanks a lot for the video

[@achinktrc]

Mantap

[@sargetester99]

You did not show us where to tap into the circuit for other voltages. Can you only tap into the end of circuit like you did? As you did that, I only saw one voltage level, not many different levels. Can you make another video to compliment this one discribing how to achieve some different levels of voltage?

[@learnelectronics]

You only tap into it at the output. If you want different voltage you change the input. It's digital to analog so you send it 0001 to 1111

[@sargetester99]

@@learnelectronics can I use the r2r lader, to have a pwm input to it and a analog output from it?

[@learnelectronics]

No, you input a binary number and get flat DC out

[@nandimasimula1665]

@@sargetester99 To get pwm to flat analog signal you'll need an RC filter or a Sallen key low pass filter, google it... Websites to calculate values for cutoff frequency, cap values and resistor values. R2R ladder replaces pwm and is a stable output where the RC filter might have more noise and can't opreate at high frequencies due to voltage range drop from recovery time for caps etc.(Sallen key filter has less noise to my knowledge, still have to test though). If you need the pins on arduino for something else you might want to use a shift register or two to save those pins for another purpose.

[@djsincenineone]

Hi great video! i'm working on a project and i need a bit of assistance, can i please message you about it?

[@learnelectronics]

Noise Anatomy sure [e-mail]

[@djsincenineone]

thanks! i sent you an email