Arduino Basics 103: Library, Port Manipulation, Bit Math, Faster PWM/ADC 

Most arduino tutorials go from basics, like turn off/on a pin, flash a LED etc. and by tutorial 10 you're talking fancy talk like using for loops and so on. With Great Scott though, the complexity is exponential. At this rate tutorial 5 will have us manipulating the universal gravity constant through software.

1:18 "...or a lazy person like me." If this is lazy we're all screwed.

Local RU-vidr Inincreases his signal frequency to 1MHz using these 2 weird lines. Electricians hate him. 2:25

I love the handwriting when you explain!

Thanks for listening to us and continuing the series. :)

Once he started playing Xs and Os at 6:00, that was the moment I knew I was destined for a career at Burger King.

This video series is definitely very useful! I'll be able to do a lot more due to a better understanding. Thanks!

Although this vid is rather old, I enjoyed watching it. I recently spent a lot of time finding this out on myself and experimenting with it. This knowledge is especially usefull when trying to play 8bit sound samples by utilizing the PWM pins and using the ADC respectively. Because you need to switch on Fast PWM and setup the prescaler correctly, this video is a nice introduction for this scenario. Great, Scott!

An excellent video. You did cram a lot into 8.22 seconds but it was ALL gold. Other viewers, who found this challenging, might like to view the video again; this time pressing pause at the end of each topic and go back until you have a feel for what Scott is telling you. The message to be taken from this presentation is that; while the Arduino IDE/"language" does make things seem a lot simpler, it does so by hiding a lot of code in the background. This is fine for flashing LEDs but a lot of the MCU's awesome power is being hidden from you to. When one comes upon applications that need to control, or interface with, many peripherals, one will find the limitations imposed on you by the IDE, limit the applications one can tackle. Well done, Scott, for dipping your toe into the murky world of AVR programming. Be brave, your subscribers will soon realise that it is just new, not "too difficult" and will be so grateful to you for that lesson.

holy shit i didn't understand anything

I really like your videos because they are concise and force you to go deeper to understand the topic. Congratulations!

It's interesting how you say that you are lazy and then you explain parts of atmega datasheet. Lazy for littles datasheet but ready for Atmega datasheet, like wtf haha :D

I don't get anything but i still watch

Definitely like the pace and the details..!! Excellent tutorials..!!

I am glad to see more advanced arduino topics. I would love to see more!

Love this video. Thank you so much for posting and keep them coming. Love watching all your project videos and tutorials. Really helps me come up with ideas for my own personal projects.

part 4 next week? looking forward to learning everything about Arduino and what I can do with it. great video as always. keep it coming.

It is not surprising that many of those who commented (Marwan Nasr El Din) didn't 'understand anything because 'Great Scott' used an approach that confused rather than clarified how one can manipulate bits in a status register to achieve a goal. Sorry to be so lengthy, hopefully you don't reply TLDR! The code to set a 'prescaler' value in 'ADCSRA' was NOT clearly described instead a supposedly 'clever' bit manipulation statement: "byte PS_16 = (1

There is two kind of people that watch this video. The ones who want to learn this and, the ones who already know the topic and they just feeling good about that they are able to understand :)

Omg I didn't understand a thing back few months but now this is just what I needed. Love ya

greatscott，油管EE科普界专门负责高三总复习的优秀教师

The "b" in bxxxxxxxx stands for binary I believe.

You sir, are the sorcerer supreme. 🧙‍♂️

Your handwriting is phenomenal...

4:03 - B stands for BINARY, not byte... like 0x for hex. It's not type definition just way to write numbers. Also you showing pin mapping which isn't very intuitive, better search for arduino board pins like: www.pighixxx.com/test/wp-content/uploads/2014/11/nano.png Edit2: Small list of Arduino pinouts: Nano: www.pighixxx.com/test/wp-content/uploads/2014/11/nano.png Pro mini: www.pighixxx.com/test/wp-content/uploads/2016/07/promini_final.png Pro micro: www.pighixxx.com/test/wp-content/uploads/2016/07/pro_micro_pinout_v1_0_blue.png Micro: 1.bp.blogspot.com/-ptZ4z1b9w20/VPW1E4ohsUI/AAAAAAAARVo/XZ3NqZ7JEP0/s1600/micro.png Leonardo: s-media-cache-ak0.pinimg.com/originals/00/55/d7/0055d75021113a0a0894feb2c4ade2ee.png Due: www.robgray.com/temp/Due-pinout-WEB.png Uno: s-media-cache-ak0.pinimg.com/originals/86/cd/1e/86cd1e943052227a9ebcf2d534beea6d.jpg Mega: s-media-cache-ak0.pinimg.com/originals/d7/c0/33/d7c0337674f0dd43bdb36484b5cabc46.png ESP8266: www.iot-experiments.com/content/images/2016/02/ESP_Pinout_01_big.png Bare uC: Atmega168/328: s-media-cache-ak0.pinimg.com/originals/4d/cb/20/4dcb20f436d46eae0fafcc03293b4fe6.png Atmega32u4: www.14core.com/wp-content/uploads/2015/06/atmel-atmega32u4-pinout-diagram.png Attiny: s-media-cache-ak0.pinimg.com/originals/0b/96/90/0b969089aad15d9b61f8ab0bf5b7f145.png Edit: More pinout maps: www.pighixxx.com/test/pinoutspg/boards/

Please create a playlists of Arduino tutorial. I love your tutorial. I have completed the basic electronics series. But unable to find Arduino tutorial playlist. Thank you.

Inspiring me to go a little deeper into my arduino projects. Thanks!

Your handwriting is absolutely amazing

Lazy?!?! I somewhat understood it but I got to practice instead of just watching the video. Your a genius

I enjoyed your video :)

Bit math section was little confusing .Thanks for your effort scott learnt a lot.

Well scott , you're great !

Very Nice Explanation... Great Scott, Great Job! Btw: The 'B' in B11110000 stands for 'Binary ' not 'Byte'. Like '0x' in Hexadecimal, eg: 0xF7 See: www.arduino.cc/en/Reference.IntegerConstants

Excellent video! Finally, I can understand the way to change pwm resolution. Thanks you so much!

Thanks for explaining the different registers clearly. I can use this info to improve some of the projects I have done!

If you talk about PORTxn registers, why not explaining PINxn an DDRxn too? Also, you can explain the T/C settings/functions/registers a little deeper. Like how to use Output Compare(s) and setup timer ISRs, etc...

Thank you Scott! This was very valuable to me - you definitely earned my subscription.

Yes, we need more of this kind of stuff !!

thanks for sharing. Nice to this more geeged way to manipulate the ADC's and PWM output, in a more strait forward way. 👍

Really great video again! I study Applied Informatics in Germany atm (thats why im already familiar with bitmanipulation etc.) and got my first Arduino when I was 14, but never actually thought increasing the performance through bitmanipulation. Man lernt nie aus :)

Very nicely done!

most useful tutorial ever

I like to call you "King of Arduino".

Loving these videos, you have earned a Patreon subscriber!

Thanks I've learned a lot from your video, even after messing around with arduinos for years :)

It would be nice if you could give some insights on how to write efficient code (in particular interrupts, watchdog timer and low power handling)

Cool! I finally understand the bitwise operations in Arduino code now. Thanks!

finally one of his vídeos i do get it completly. just cause i did also read the entire datasheet for a school project 😂

I click the "like" button before view. Because I always like GreatScott!'s videos.

awesome as always. Keep up the good content

You're super duper smart man I'm going to be really studying your stuff thank you

and if you incorporate the goto loop; at the end it will short the off phase as the rising and get faster frequency

ok thanks mr.GreatScott for arduino 103, now i learn much about arduinos ;-)

when i learned​ this things in my engineering class i only concentrate just because of my electronics teacher is hot , this time my mind start boiling but great video great Scott

My project requires 16 or more leds, for a runway chaser sequence with a very small footprint. I'm trying to simulate runway lights on a small aircraft carrier. Maybe three or four leds, the first one at 100%, second at 75%, third @ 50%, and fourth @25% chasing from left to right in a repeating pattern. As soon as the four leds reach midpoint in the travel direction, another set of four leds follows from the start position, so you will have two sets chasing from left to right, and so on. When the first set reaches the end, it starts over again from the beginning, same with the second set. I have looked all over the web and have had nothing that fits all the criteria. Doing it on an UNO will not work as there just isn't enough room in the model for the large board. 555 timers with a shift register won't work as most don't have a way to make the fading effect. Can you help me with a solution? Thank you.

That was a good lecture on bit math

Thank you so much Scott! I really need this info for my college assignment

Excellent tutorial as always

it sounds really cool it's a lot more complicated but you can do really cool stuff at a lower level.

What a great video!

I love this series! I just hope you can make a dimmer for 220V lighting controlled by a pot or some code. :-P

And again great job and thanks for the video!

You are great Scott!!

Scott. Thanks for doing all this and helping us. It is a bit. Too fast for me though and some of the things you appear to edit out maybe useful after all? It is impossible to get the pace right for everyone, but if you go a bit slower, the bright folk can always increase the speed.

wow! Nice tips, thanks! Now I have to read the 328p datasheet for complementary studying

Amazing videos !!

Thank you very much for your all video always Learning from you helpful useful Thanks

great series keep moving forward

@GreatScott! Please let us know lots of your opinion. We want to know the reasons behind why you choose one way/thing over another. Also, project suggestion : make a pc power supply into a bench power supply.

Thanks for a great video

GREATSCOTT! YOU SHOULD DEFINITELY MAKE A VIDEO EXPLAINING HOW TO BUILD A CIRCUIT, CODE, APP AND ZERO CROSSING CIRCUIT WHICH CAN CONTROL AT LEAST 5 AC LIGHT BULBS AND BE ABLE TO NOT ONLY TURN THEM ON/OFF BUT DIM EACH ONE OF THEM SEPARATELY VIA BLUETOOTH HC-06 AND ANDROID APP. THAT WILL BE A CHALLENGE!!!

Great guide, but as I study Embedded Systems I totally get that people never having used bit math or bit masking have no clue what the video is about. I'd definitely like to see if there is even more in depth stuff to learn!

Thank you very much ! I was using a similar code to that in my multi-level inverter controller digitalWrite(outPin, HIGH); delayMicroseconds(50); but it didn't accept float values , nor variables . I think now i can manipulate your method to make it more accurate

relentlessly waiting for ur reply!!!!!!!!

Don't get discouraged! The information provided in the video is condensed into 9 minutes, there is a lot of information you need to know to understand this video. You'll need to know digital circuit theory/math for example.

Really helpful video, thanks!

Hey Scott!! can you make a video Explaining more about the Fast PWM with registers please, what i want to do is to change the PWM frequencies of the pins 9, 10, 3, 11 all to 31khz. I need your help can you help me please, Greetings from México!

i think you're advanced in arduino..nice info

This one is very usefull video! Thanks a bunch i always wanted to start converting my slow arduino code to fast code via registers

I'm definitely going to have to rewatch this a few times over to take notes because all of this is a bit over my head. @~@

A lot of good stuff to chew on there.

thanks for the video. i am a beginner. i have a question; can we exactly choose the PWM signal frequency in arduino? I am trying to drive a MOSFET in a converter which is controlled by switching frequency not duty cycle so the frequncy of the PWM is important for me. I appreciate you help :)

So instead of processing 4 million check per second, it wait for a clear event and execute once. I can only assume it is much more power efficient and would help reduce 9v battery drain? Could you measure it?

this is extremely useful Thanks!

i am fan of your videos, do you wanna know why ? because its GREAT. Scott.

i love your projects LoL

Question on the last advance example, was all that bit math used to change the sampling rate? What was the need to keep the bits with X's? (Or was the first 6 bytes toggled for something else?)

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@GreatScott! What do you mean by that " the Internal timer can be clocked by a prescaler"? This is a pretty complicated line for me to understand. Can you explain a bit?

This will be handy for setting unused pins on a mega2560 to non floating/input with pull up. without a whole bunch of digital write or pin mode commands

From another topic. Will you do a video how to do my own 3d printer from old cd/dvd readers using any magic stuff (can be with 3d pen)? Actually Im bad at these things and ur the only ytber that explains so well everything :)

1:43, 0xDEADBEEF = reference from team fortress 2 bot's name XD

show how to make a library for a simple component... looking at the datasheet, understanding the registers of the component and all of that stuff

If i hadnt taken 2 courses like this at the university id be so lost right now...

If this is "Basics" advanced is gonna give me an aneurysm.

Is there a way to map a digital signal with arduino for instance I want to emulate a NZXT hue+ so what i have in mind is hook a adrino up inline with the hue+ read the digital output for the hue+ led controler and then use the recorded singnal to controle the led's.

Nice Work!

Hi GreatScott, can you please do a videos series on Labview interface with Arduino in future.

May be u can help us by making an additional video for your earlier rf video in nrf24l01 pipe setting for one receiver and 6 transmitter with bi directional communication

Really nice. :)