NEW Arduino UNO R4 - All you need to know 

The second memory value, i.e. the 2kb in 32kb/2kb for the R3, and the 32kb in 256kb/32kb for the new boards are SRAM. SRAMs are used during runtime, this is used by your variables. Code comments are not included when you compile your program. Having a bigger SRAM means you can create and use bigger variables, like when you want to create huge array for keeping track the value of an LED array.

Good summary, thanks. One comment though: for compiled languages like C, comments in the source code don't cause memory problems because they're not present in the compiled code.

I'm confused about the code comments in the code and their flash memory usage influence 9:29 . I presume that the comments are stripped away with the preprocessor before the compilation of the program. What do you think?

Thanks for your information. The only thing I think it's worse compared to the R3 is the max 8 mA current per I/O.

Nice, actually makes a lot of sense. A few years back I was working on a project where I needed multiple radios, the 8266 gave me wifi but you never get enough IO on those boards. The other radios were more suited to an arduino because of things like IO and timing. I ended up building a board that did exactly this, it was basically an arduino with an 8266 attached to take care of wifi and data is stilll being passed between the two of them today. I've printers done this way! Do we redesign the whole machine around a new processor, with a new operating system, with a full IP stack, and implement the encryption... or we could just throw in an ESP32 on a daughterboard in there, it is only a printer after all. If this was available back when I was doing my project, I would have just used these.

As far as I know, the Qwiic connector is the same as the Adafruit Stemma QT: both use 4 pin JST SH connectors, which are 1.0 mm pitch

Comments are not compiled into the code...

just pre-ordered it and look forward to arrive soon

I was the biggest supporter of USB-C after I got a 2016 MacBook Pro and it’s really annoying that so many companies are switching over now after such a long time. I have dozens of spare 2-3m USB A-B cables from old printers etc, but I’m not sure if I yet own a single USB A-C cable over 2m. Most I have are like 10cm long and some don’t even transfer data. And now with WiFi you’re going to see high voltage AC plugged in right next to Arduino school projects with wires going everywhere because so many USB A-C cables are only 10cm.

The Renesas Cortex M4 on the R4 Wifi seems to be redundant with the ESP32 onboard, and using the ESP32 just for its wifi and bluetooth is rather wasteful.

So can the ESP32 be programmed to do more than just Wifi? Are are of the pins connectable?

The LED matrix would still be useable for a real product to display error codes for example...

extremely cool my electronics teacher is probably malding right now seeing all the money he spent on r3's

It's funny their WiFi chip is basically as powerful or more powerful than the main chip. Biggest thing "striking it" from this project in particular is it only being 3.3v capable However I've always been weirded out by the pin form factor. Its nice and big for first impressions but quickly becomes unwieldy for integrating into a project Comments are never put into your actual executable code as the program size Would love to see one or two versions of these in the nano format.

I'll wait patiently for the clones to start to show up on Aliexpress for less than 4 euros.

What i would really like is a R4 Minima, but in the formfactor of the Nano or Micro.

now can be support LoRa protocol with one board arduino uno

Qwiic is pronounced as "quick", and is pin compatible with Adafruit's STEMMMA QT.

Don't you use some of the extra memory just because it is going from 8bit to 32bit? Edit: If you sort the boards by "Best Selling" the one with the DIP socket is much higher than the SMD one.

Uno is good for education or maybe one off projects, but that's about it... 18-25 EUR / borard is far too high for making products in volume and still be competitive on the market. I personally never cared about wi-fi on every microcontroller board, or even having USB... I care about low price, and small size, but then they killed the pro-mini, and came up with some overly expensive shit... Good thing is I can still find pro-mini knockoffs at least. The thing is If I need wi-fi, I prefer ESP12 modules, if I need lots of I/Os, picos are cheaper, If I need cheap controllers, I use bare chips(atmega328p, attiny44, atiny85, etc.) and now I'm looking into to STM32s cause I've got a few low power projects...

Can someone explain what the use case is for an onboard LED matrix? For that matter, what is the use case for any Arduino when superior alternatives, often at lower cost, are available? No matter. If Arduinos prevent more buyers of Raspberry Pi, then go for it.

you did not mention what cpu the new versions use.

I think it would be nice to have a Minima with LED-matrix, but I gues I'll just get the WiFi version.

great video

not "All I need to know" as I need to know how the R4 Minima compares to Leonardo now that R4 has USB-C and HID.

"Qwiic" is just "Quick", the same pronunciation

Now, each actuator shall have a local controller, and all controllers shall be slaved to the system manager via CAN bus using deterministic scheduling.

The removing comment part is totally false, i don't think anyone does that (except him obv, lol). Ur Arduino gets the compiled version of ur code not just ur raw sketch and the compiled version doesn't have comments so no need to remove them manually. Also the rest of the video was of no use, it was just comparison of 2 charts which u can read in like 2 mins

It's pronounced "quick"

comment in the code take no space.. what a BS

esp32 starts from $3.... Arduino is so overpriced. Even if esp32 would be more expensive I choose esp32 anyway.