Using Arrays with For Loops

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I would say that arrays are one of the most useful programming tools available. Every programming language that I'm familiar with, at least, has some form of an array. If you're trying to learn a new programming language, one of the things I would recommend is to get familiar with how to write and manipulate data in arrays. Like, if I was gonna learn a spoken language, like Russian, I'd want to prioritize learning the most common words and phrases first. Well, if I am learning a new programming language, I am gonna spend a ton of time learning how to use arrays in that language because they're just so fundamental. In this video, you're gonna learn how to go through, that is how to iterate through, an array in the Arduino programming language. If you can do it in the Arduino language, then you can also do it in the C and the C++ language. Knowing how to do this opens up a ton of useful possibilities for you as a programmer, and I'd argue, it's really an essential thing to learn about any programming language that you're interested in using. Stay tuned. Subscribe to our UA-cam channel to get more videos like this. All right, before I jump in, I just wanna say a huge shout out to Altium for sponsoring this video. If you check out the description, you can get our link to a free trial of their software. All right, so here we are in the Arduino IDE, and I'm gonna write a little bit of code, and then we're gonna talk about it. Basically, this is what I'm gonna do. I am gonna make an array and I'm gonna say, like, "you know what? This array is gonna be filled with sensor readings from some sensor," like maybe, maybe my device is getting a packet of information from some other device, right? And I have no control over that other device. I'm just getting a series of inputs from some other device, and so I'm gonna make an array that kind of, like, mocks out that input, and then what I'm gonna do is I'm gonna iterate through each one of those inputs, and then we'll print it out to the serial monitor. So let's do that. All right, so what have I got here? Well, the first thing I did is I created an array, and this is just like a mock-up array. It could be whatever, but this is an array that holds floating point values. The name is called sensorReadings and the size is four. That means it can hold a total of four values. It can never hold more than four. Like, the limit, the size, of this array is established when you first create it. So the size is four, and then I initialize it with four separate values. Now, you don't have to put in the values when you initialize it but in this case, I have. So I've got four floating point numbers that I initialized it with. Now, for this discussion, what's important for us is we understand, like, what the index of these numbers are. So let me just write that out above this, so we can get clearer. So the index value refers to the position of the element in the array. Now, if you're wondering like, "hey, what is this index thing?
CONTINUED...
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[@aaronfidelisrecine]

MANNNNNN I've been losing my damn MIND trying to understand for loops and arrays and WOW you make it so easy! THANK YOU!!!!

[@programmingelectronics]

So glad it helped!

[@warrenstaben6166]

Thank you so much. Your videos are so well done and easy to understand!

[@programmingelectronics]

Thanks for watching - I am glad it's helpful!

[@ChadKapper]

Every video is better than the previous! You do such a good job of helping me discover the value in the details.

[@programmingelectronics]

Thanks Chad! Much appreciated!

[@Cor_Netto]

Outstanding explanation!

[@programmingelectronics]

Glad it was helpful! Thank you!

[@interlightstudio1645]

Been watching your vids since 2019. I Truly like the way you provide information.thank you

[@programmingelectronics]

I appreciate that! Thank you!

[@KW-ei3pi]

Thanks! Very good tutorial. You went through the last part pretty quickly, and I couldn't figure out why "now" didn't print on the second and subsequent loops. It wasn't entirely clear that the INDEX values were in memory and could be overwritten by code to a new value. I get it now. Thanks. Regards.

[@maggotdude667]

You break down information so well! I really appreciate these videos.

[@programmingelectronics]

Thanks so much for the note! Much appreciated!
If there is any info in particular you are looking to learn about, please feel free to let us know and we'll try and make a video on it.

[@maggotdude667]

@@programmingelectronicsPerhaps interrupts/timer interrupts?

[@warrenscorner]

That was a great tutorial of a for loop! 😂 Maybe part 2 can explain how to append an array or what types of variables can go into an array.

[@programmingelectronics]

Thanks for the note and recommendation Warren! In retrospect I can see this is more a "for loop video" than an "array video"
We changed up the title and thumbnail to hopefully reflect that better.

[@IngeBall]

This is golden (as is the whole series)
Subbed!

[@programmingelectronics]

Glad you like it!

[@MarkATrombley]

At 16:30 why is the first line of output messed up? It happened on the other examples too.

[@programmingelectronics]

Great question and nice observation Mark! I am sure some out there could explain this (and I would love to know as well), but I _think_ it has to do with the Serial Monitor reseting the Arduino when it is opened.

[@user-gw1pj7fh7q]

Вы большой молодец , что делаете такие обучающие видео , спасибо большое !

[@joshuapitong899]

Really helpful.🙌

[@programmingelectronics]

Great to hear! Thank you!

[@Bianchi77]

Nice info, keep it up,thanks for sharing :)

[@programmingelectronics]

Thanks for the note!!

[@thomashvnmusic]

This is really good, thanks!!!

[@programmingelectronics]

Thanks a ton for watching! I hope it was helpful!

[@thomashvnmusic]

@@programmingelectronics Im probably one of the oldest fans on the channel. I followed your channel about 8 years now and i remember the first videos you posted when you were drawing and explaining the micro-controller pins on paper. Was a fan back then, still a fan.

[@michaelcheich2481]

@@thomashvnmusic Thanks for sticking around!!!

[@thomashvnmusic]

@@michaelcheich2481 Absolutely!

[@AbrarShaikh2741]

Thanks for the video. However, it is more lf a FOR loop video then Array Video.

[@programmingelectronics]

You are right! Title adjusted, and I think we'll change out to a more representative thumbnail.
Thanks @Abrar!

[@syaduinotech3681]

Thanks for the video, hope you can share the application of using this on the sensor as you mention in the beginning. Tq sir

[@programmingelectronics]

Thanks for watching!

[@miroslavmikus6480]

If you don't need to know index i, you can use range based for loop: for (float val : sensorReadings) { } ; plus with another feature of c++11 "auto": for (auto val : sensorReadings) { Serial.println(val); } - less you have to write mans less bugs you can make

[@joroxanborata3102]

hi thanks you for the informative about arduino can you make a video to combine 3 sketch that have different doing. like relay lighting , automatic water, and a dht11 sensor

[@programmingelectronics]

Thanks for the note! I'll see what we can come up with for you!

[@ianclaproth3675]

An excellent explanation of how the for loop actually works when iterating arrays. Thank you.

[@programmingelectronics]

Thanks so much for watching!

[@Skyrime007]

How to iterate array with millis() function or iterate through multiple arrays simultaneously

[@TheStudpop]

Seems to me that i = 0 gets incremented before the next line, so the array’s index will never be 0 but rather 1,2,3.

[@programmingelectronics]

I may have not explained it appropriately in the video, but when _entering_ a "for loop", the variable gets initialized and the condition is checked. The increment/decrement happens at the end of the for loop before the next check of the condition.
1st-> initialize var, check condition
n...-> increment/decrement, check condition
Hope this helps clarify!

[@TheStudpop]

@@programmingelectronics You're the best! Thanks.

[@LilGh02t]

The '++' operator increments the variable. If it's placed after (i++), the variable will be incremented after the code in the loop is executed, if the operator is placed before the variable (++i), the variable is incremented before entering the loop. Same rules applies to the '- -' operator.

[@user-ue7gi4eg8u]

god bless you

[@j.w.8663]

👍🏻

[@Mica_No]

Its so entertaining listen to you

[@programmingelectronics]

Thanks so much for watching!

[@frankbaron1608]

hip, hip, array

[@flywittzbeats4008]

char bestTeachers [][3] = {{“Programming Electronics Academy”}, {“Brocode”}, {“Paul McWhorter”}};