Level Up Your Arduino Code: Registers 

The next episode is up! Learn about external interrupts in Arduino: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-J61_PKyWjxU.html

Your visual props and paper, clear voice and audio, pacing, sequencing, spiriling, and script are SO HELPFUL. You are a really good teacher. Whereever you work, you deserve a raise, promotion, and an assistant. Go get 'em tiger!

This is a great reference. Actually this is the first reference I found is comprehensive enough for me to understand the registers. Great job!

Awesome video. That was the best explanation I've seen on the matter.

It's amazing to see that what I'm learning in school actually relates to something really fascinating and useful. Well done!

one of the most advanced Arduino tut I have ever seen. thank you a lot.

It's nice how you saved almost half the flash memory space, that's one nice perk of programming in a lower level language. It's just ridiculous how you did not mention literally that it will run much "faster" than Arduino "overhead". All in all, this is an excellent tutorial with zero confusion and explanation about making use of microcontroller registers using the bitwise operators.

The most wonderful thing I've seen in a long time.

feels like I'm enlightened! expecting more of this kind of videos! really really thankful to you!

This is the best explanatory bit math lesson i ever followed. Thanks very much Sir.

Great video!!! Learned a ton from this video! I’ll definitely be downloading and saving this lesson! Thanks for explaining this. 👍

brilliant explanation. I look forward to seeing the follow-up video(s).

GOD. That was so clearly put together. THANKS.

Nicely done, great example and pretty quick pace.

Long before Arduino came, we MCU programmers had always been doing this. Took quite a while to learn all those bit banging, but it was worth the time spent. Anyway, good tutorial. :)

Awesome Video! Very cool Idea with the Containers to show how to set the bits

This perfectly demonstrates the benefits of more abstract programming languages: they are more readable and less prone to bugs. It also demonstrates benefits of avoiding abstract languages in microcontrollers. Damn! Now I need to rewrite all my code 😉

very well explained, thank you for putting so much effort!!!

I finally understood registers. Great video!

This is an UNBELIEVABLY AWESOME TUTORIAL!!! thank you thank you thank you thank you!!!

I have never ever seen such a positive feedback command section before. It really is an iconic video!

This is awesome! Please more tutorials on this topic. If you can,please add some references to books or so, so beginners can catch up on this topic. 👌👌

Can't wait for part 2!

Profoundly useful information presented clearly. Thank you!

This was fantastic! Thank you. I learned a lot.

This is the exact video I’ve been searching for to begin my bare metal journey. I wanna know all the tiny details in every nook and cranny.

That's funny. I'm writing down in my notebook as when I was at school. Thanks, professor!

all stuff get simpler with good analogy, thanks a lot sir

Awesome. A real expert who masters Arduino, and much more for sure.

So good to have machine level programming being taught so well, hopefully this will help understanding of how micros work in reality rather than point and click abstraction it is for most programmers. Do you know of a good optimising compiler for Arduino, that can produce this level of optimised coding?

This is awesome! Thank you for the amazing tutorial.

Useful video. We love it. Thanks SparkFun 🙏

Really good tutorial. As I'm new to all of this, it takes a bit to wrap around my head...

As an engineering student, this video was interesting and helpful ! Thank you.

Another thing I found amazing, was the SPEED increase from doing multiple digital writes to being able to write multiple pins directly at once (as long as they are on the same port letter). It wasn't just "faster" it was Monumentally faster. When dealing with multiplexing Multiple 7 Segment LEDs, the "off segments went from having a ghost of the previous figures to being very sharp.

Never thought about that, thanks for making this this video!!!

Excellent tutorial! Thank you sir!

Excellent explanation i had met so far, thank you,

Excellent video Shawn! Definitely was a good refresher for me. :)

really good job with all your videos they a treat to watch.

this is good like really really good. I NEED MORE

Awesome video. great work guys.

good at reducing memory usage thanks for the tutorial

Very great explanation. Thank you

I can't possibly imagine a better tutorial. Okay, I probably could, but you came pretty darn close!

I LOVE THIS, THANK YOU SO MUCH!

Very good explanation. Goodjob

If only I could hit Like every time I'm watching this video without dropping my previous one... Thank you!!

Brilliant...nothing against adafruit...but here is the beginning of you not having to depend on another library maker for code! As an an exercise you can look at the low-level libraries that are out there and it would look more like the code in the video...great for learning! :-D

The 660 page monstrosity is what enthusiasts read and understood before meta languages and corporations made money making things more high level, easier to understand, and also slower and less efficient. Now you make videos explaining what a register is. Edit: Alright, I was kind of salty. This is a pretty good video that goes into depth and is quite understandable. Have a like.

Thank you !! Thats what i am looking for :)

really great video, thanks a lot!

excellent lesson.

Thanks for explenation. I have a question: how can we do bitwise operation if the button pin is (let say) pin 12 (PB5), and ledPin is pin 12 (PB4). I mean in digitalRead part. Do we still have to define ledPin as output ? (Because of DDRB =001000, all other pins exept 5, are inputs. )

Thank you very much for your episode, but I am still having another trouble while trying to connect two sensor in one raspberry pi board. May you please help, especially changing the address!

very nice video. great work thank you sir

It was very nicely done

Great explaination !. but could you explain the analogwrite and analogread funcutions ?

Great video and useful ...

Clear teaching

@10:40 it is a better practice to manipulate the DDR register value by using the OR logic. For example, DDRD = DDRD | B00100000; would be a better practice because digital pins 0 and 1 aren't supposed to be meddled with as they're used for serial communication.

amazing content, very well explained

Very nice! You don't need to shift to right when reading digital input because any value different to zero is considered as TRUE.

I watch for two minutes and I try to like only to see I’ve already liked.

Nice video, I had experienced ur course on arduino helped me learn a lot if possible please come with another course on register programming on Udemy thanks for this video

Really helpfull thnks for share.. best regards

Excellent!

AWESOME! Brilliant!

Bitwise is amazing. 👍

title should be: "level down your arduino code"

Thanks for the info..👍

Really helpful video. But I have a doubt. By manipulating registers, how can we generate pwm signals. Basically I am asking for the replacement of the "analogWrite()" function. Thank you for the help.

Awesome...make video on PWM control and Serial communication in Arduino by using Registers(port manipulation)...Advance Thanks...

Please upload more about data register.

The Arduino.h file has the bitRead, bitSet, bitClear, bitToggle, and bitWrite definitions that do all the bit shifting, we just enter the register and the bit

Doing it by registers also makes accessing those input pins a lot faster, fairly sure the number I saw was ~56uS for DigitalWrite and using that register method brings it down to 5uS. I will find the name of the video and put it on this comment.

Reminds me of the peek and poke in my old Vic 20

I use int sw = PIND & ( 1 > boton; for read a digital port, but if I need Read an analog port witch registers what need to do?

where can i find the pdf for it and can you put the mega register onto a arduino uno?

Hello Sir, would it be possible to write a variable (integer for example) to one of the Arduino registers and then reading the register from a PLC using modbus (through RS485 shield)? Or, is it possible to write a variable from Arduino directly into a PLC register using modbus?

where do you get the arduino base in 8:16?

Can I write for example 0b10101010 instead of B10101010?

What for you wrote >>btn_pin in the first line of the loop at the end of the line: int btn= (PIND & (1 btn_pin; when we have: const int btn_pin=2 and int btn is already assigned: int btn= (PIND & (1

awesome explanation thank you!

@17:00, you spend a bit of time determining the value of a bit. The AND isolates the bit, but that's as far as you need to go. Since it also ensures every other bit is '0', all you need to do is test for non-zero (usually the second fastest test in a microprocessor). i.e. If The shift you use to test for equal to '1' is unnecessary. "HIGH" and "LOW" are typically macros for non-zero and zero, respectively. If that's how the Arduino library defines them, you woudn't even have to change your If statement.

4m47s There are three possible states for a GPIO-pin, not two as told. A pin can be digital in, digital out or high impedance.

Hi, Thanks a lot, its really greate effort and great knowledge. i need to do a project for a preset position linear actuator with a DC motor abd a stepper motor, with Arduino Mega or UNO but i am not able to write the code and the scheme, can you please help. Regards

What are the little bins usually used for? Or were they made specifically for the purpose of illustrating bits? Can't think of anything that small needing a mini bin.

If you're trying to save space and execution time, just use PORTD = B0010000 & PORTD; Saves two instructions and 3 or 4 clock ticks.

YT channel 'Joop Brokking' posted this project in 2016. Arduino makes code "human readable", in that it makes sense to beginners. The Arduino IDE is great to get acquainted with embedded, I'm 100% stoked its out there, but to make it to the 'real world project level' you have to manipulate registers without the crazy 'Playground' overhead. If you want to be freed from GitHub, you will have to learn to read the data sheets yourself, and not expect others to do the work for you. Bottom line, an ATMega328 costs less than a buck ($1) and you can get 'Blinky' working for less than 1% of the available space using a better IDE.

fantastic

Why the register codes completely doesn't work on my Arduino mega 2560? Is that because of pin issues?

I have a question how can I a 2 robot arm project and a motor vehicle project in one arduino uno is it possible to make it happen..?? I have been working on it for months and no use for it I don’t know if my codes is right or it won’t work ...please help me..!!

What can be slightly confusing to new users, are when you are using IO pins that are not "inline" with the port Pins. Example IO pins 8 thru 13 are PINB 0 thru 5. So instead of defining the Variable as the IO pin you would want to define them as the PINB pins... So for a button hooked to IO pin 8 you would want variable as such const int bnt_pin = 0; Not const int bnt_pin = 8;

brilliant

are the code register worked in esp8266?

Can you share the data sheet

Wow, I didn't know you could do this with a arduino! What would be the point of using registers on code when it does the same thing as the normal code? Am I missing something here?

how can I write in RFM69HCW registers ?

Wait a moment! You are removing the pull-up resistor from PORTD (12:30 - 12:35). You might run into an issue here, making the Arduino unable to recognize that you release the button (input pin stays at 0V). Or am i interpreting this the wrong way? You have to set/clear ONLY the 32's position bit on PORTD when you turn the LED on/off...