Dope Tech Episode 2

<<@chizbreds1717 says : seeing you put 220 ohm resistors to act as load to green LEDs kinda scares me haha, AFAIK R4 digital pins are only rated for 8mA It should be relatively okay given that they're blinking but I'd be safe and put 390 ohm resistors on there>> <<@anandagoswami7373 says : Thanks for a very nice video. I have just started with an Arduino Uno R3 (about 40 years after I put away my Zilog Z80 with a 555 timer for its clock and a bunch of TTL logic ics and a uv erasable eprom. Great fun. So here in retirement I am stumbling, fumbling and bumbling my way through C++ and getting loads of compiler errors to sort out. Again, good fun. Try as I did, I can't get the goertzel algorithm to work. At 73, I don't hear too well and I was thinking of making a sound detector for my digital watches - they beep but I don't hear them and one of Casios has 5 alarms (fire, foes, fear, fly and fight) but I can't hear any of them - the project will be to detect the beep (likely 2048 hertz) and sound a loud buzzer or flash a bright led. Bad hearing problem solved - new problems around the corner. Let's see it may take a while as I have plenty of other things to get through - people, great people wrote so much literature and music.>> <<@TruthLives4444 says : YAY!!!>> <<@paulustrucenus says : Wait there was a new Uno after the R3 AND I DIDN'T KNOW>> <<@tremolo_painter says : Took my R4 minima lights to show the ducks. They were unimpressed, and told me you had been here 2 years ago :)>> <<@IAGVyuing says : Hello, getting the following error when trying to upload sketches "Upload error: Failed uploading: uploading error: exit status 74" My board does not blink when the usb c is connected.>> <<@nataliecibej says : nice video>> <<@kevinwalters2076 says : I enjoyed your introduction, very thorough and very clear. I think your 220 ohm current limiting resistors may be a little low for the R4 boards. The R4 boards are documented by Arduino with an 8mA current maximum for GPIO, compared to 20mA (40mA abs max in ATmega328p datasheet) for R3. If your green LED Vf is 2.0V then 390 ohms would be more appropriate. As you are pulsing them and the board actually runs at 4.7V from USB power I can't see any risk here but it's useful to set a good example. I think quite a few projects that migrate from R3 to R4 will get caught out by this.>> <<@3D_Printing says : GMKTECH mini computer waiting since 9 January 2025>> <<@3D_Printing says : Arduino: UNO no debug option in the IDE>> <<@kabandajamir9844 says : So nice thanks sir>> <<@NormanNodDunbar says : OK, I know this is a year old but I've just got an R4 and I notice from the data sheet that pins only manage 8mA maximum current. Your 220 Ohm resistors are letting nearly 13mA through assuming I can count and the LEDs drop 2v. Better to use 1K resistors which would be 3 mA. Other than that, good introduction to the R4. Thanks. Cheers, Norm.>> <<@jorisArt says : I was entertained and informed by your great intro video. I’ll look forward to my first arduino.>> <<@brightness8496 says : I guess int f was not defined>> <<@David94305 says : I am so glad I found your channel, what an amazing surprise>> <<@hajerel8677 says : ❤❤❤❤❤❤>> <<@dagnolof says : Why is com port disconnecting after programming R4 minima board. How to you connect the com port again please.>> <<@bigmacsauceboss says : The laser focused, soothing, 80s-90s educational TV style is just perfect.>> <<@mlaoun says : Hello, thank you for introducing this new board. I am using this board, and I am facing an issue with it, maybe you can help me: the standard library SPI.h doesn't work with this board. It works well with the old Arduino Uno, though, but not with Arduino R4 Minima. Have you experienced this issue too? if yes is there a solution? another library for using spi communication? Thank you>> <<@dougs_trains says : I see you getting really excited over this. Imagine this device being around 30 or430 years ago when we were mucking about doing this the hard way. I've just bought an Uno R4 Wifi, and have managed to get it running as a webserver and relay controller that I can control with a web browser on a phone etc. fun times. The motivation in getting it was to build a model railway turntable, using a stepper motor and indexed positions etc. which I'm sure to get onto once I've done playing around.>> <<@berinslaptop says : would be nice if someone could create all the build requirements and publish the build files and code for GRBL 32bit to compile and load onto the r4 minima. Would make for a monster upgrade to people using atmel based arduino uno's.>> <<@eldjmasterfreddy4366 says : Great Presentation>> <<@AlanOxley-c6r says : Superb introduction to the new Arduino Minima R4 board, the IDE, and even some C++ basics! Highly recommended to anyone new to Arduino or SBC's in general.>> <<@championslayers says : Interesting! I have been using arduino boards for years and didn’t even know about the new minima. Very cool. My favorite for simple projects is the attiny85 though. You can even run those on coin cells.>> <<@ted_van_loon says : a datasheet with all the basic importatn info such as board layout hardware pin byte and bitmask info, etc. is indeed very usefull I have had many times that I wanted to program some boards but then you have to figure out the byte adresses of the gpio pins, and you can't find any clear data about that other than when you reverse enginear some code or look very deeply through all the documentation of the cpu and such and then figure out from the traces which is connected to what. having a RTC also is very great, having those other extra features also are great, I have seen many people who wanted to generate high quality audio with arduino uno's but there wasn't a dedicated port before so it required custom hardware or heavy software which gave decent audio quality but also used a large amount of the processing power and/or the interupt pins. it looks like however that this board can be made very small. I also do wonder how many pins the IC can handle in reality since they followed the default uno layout but perhaps they might eventually make some micro version or even one with more ports if it really has a lot more. the led matrix also is quite cool to have, just a small screen for example to make a pocketsize computer, low res so not much data but you could still use it for some thigns, in the past I remember designing matrix display for the uno myself just to make some kind of super minimalistic computer device. what is great about the uno boards is that you can very easily and directly controll the outputse using bitshifts and such, which often actually is much faster and more easy than manualy calling for the speciffic pin since you can just combine many types of logic in one line and it will do all, also will use way less cycles and ram since the GPIO themselves also are like ram in that case.>> <<@learningisglorious says : I don't recommend buying this particular Arduino R4 Minima. I got one directly from the Arduino store. The assembly quality is not as good as (bad) the previous Arduino board I had. The programming procedure is slow and continues to connect and disconnect from the computer every time programming a new code, that's very annoying. I recommend you stick with Arduino Uno unless you need the USB HID Device function. Or better buy an Arduino Due with 2 separate USB ports, much more IO pins, function, and speed.>> <<@stevenshiller1600 says : Explaningcomputers is Columbus R&D Project.>> <<@arxaaron says : Nice to see you exploring micro land again! Real good walk through of the R4 and the Arduino programming environment.>> <<@smartassist9700 says : If you are controlling water pump(s) to water garden. Multiple pumps and hoses. Do they have to be 5V and lower? I have 1 pump that gathers all rain water barrels to a large retainer storage…. THat runs off 110V.>> <<@dc37009 says : Arduino fans, checkout XOD, a visual-block programming interface (free open source) . Its very powerful, and much easier to modify C++ library's, than to write the entire code ! ~Well done Chris !>> <<@lorisrobots says : Thank you for sharing this video. Excellent content as always.>> <<@thomasmcguire2227 says : Thanks for info on arduino. I was looking for a microcontroller. Most sbc's draw too much power.>> <<@AndyOlesin says : While Audio and Analog both begin with an A and Audio is Analog, and Analog can be Audio, not all Analog is Audio. Which is why DAC stands for Digital to Analog (not Audio) Converter.>> <<@Justin-Case-2.0 says : Thnx for another great video that finally motivated me to release my Uno R3 clone from its plastic bag (with a little help of Mr. Scissors german relative). Now what to do with such a device? Well, my first project was to simply try make the board work which took me some time. I tried it on several PCs with different operating systems and got it finally working with Win7 and Lubuntu18.04. on my old EEEPC (while more recent OSs refused to connect to the board). Windows requires a special usb-driver (CH341SER) cause the clone has a little bit different hardware than an original Arduino. Linux requires some special permission, in my case i had to join as user to a group called 'dialout'. Currently my board is connected to five LEDs like in your video. I am thinking about using it as input device with several buttons to input caracters that normally need two keys pressed simultaneously on a standard keyboard. Nice greetings, i am very curious on your upcoming video for this weekend ;-)>> <<@amanguptalko says : I always comeback to this channel because of its retro early internet era styling>> <<@weerobot says : Nice..>> <<@emuhill says : An interesting demonstration would be to make a simple traffic light out of this thing. Maybe even demonstrate traffic lights around the world.>> <<@DrorF says : 16:36 I think they will be very interested in the DAC 🦆😉>> <<@whothefoxcares says : Is there any way to verify what #openAI says? It seems to know some python, lots of law, but not where to find an automation-proof job, or an honest politician.>> <<@martinwragg8246 says : Is there provision for keeping the current time on the RTC when the Arduino is unplugged?>> <<@zoldaten123 says : Да, прошли времена, когда ардуино можно было за пару носков купить.>> <<@sureshparmar8284 says : Thks for a really inspirational video, I can remember using the Intel SDK-51 which I still have in the loft.>> <<@judsonleach5248 says : Mind if I make a quick, unrelated RANT, Sir?!? (You're gonna LOVE THIS! - Trust Me?!?) So.. 5 out of the past 7 days... I've dropped my Logitech Raspberry Pi 4 keyboard on the floor... or looked at it "Cross Eyed" - And heard THIS!!! - "LOADING ORCA!!! - PLEASE WAIT !!! - What's that Darth Vader Scene from Star Wars?!? "NOOOOOO!" = LOL I mean...MAYBE if I was Blind & Deaf?!? - HAHAHA! - "Enough Said"?!? - HAHAHA! Cheers! - Judson & Buddy! - God Bless You ALL !!! 🙂>> <<@flashcorp76 says : Outstanding 😊I know C++ And Arduino 🙃But I couldn't help myself and watched Your Vidéo ☺️that just go to say..... 👍🏻>> <<@arjunrao9978 says : Christopher Sir You select the Best Topics. Thank You! ❤🙏🏼🙏🏼>> <<@joeg3950 says : A long time project in planning stages: Crass Clown. I use a creepy old-style or antique clown doll, install an infrared sensor, audio files, and maybe glowing eyes. A person passes in front of the Crass Clown either to be insulted or tricked with audio. The unsuspecting person passes by, a delay of 2 seconds, then broadcast an audio file and possibly flashing eyes. No one knows about this project in my household. I’ll deploy the doll in an unsuspecting area. Hopefully, I can get some interesting reactions.>> <<@michaelbradburn9923 says : What is the best sbc on the market?>> <<@qdmc12 says : I'd build a drone with the wifi alternative>> <<@robyn6521 says : I recently got an Arduino Uno R3. I am planning to make a simple aquarium controller to ramp the lights on and off on a schedule and also to control a pump to automatically top off the water.>> <<@eddysedg says : Thanks>>