1-Day Project: Build Your Own Arduino Uno for $5

Clones of the popular Arduino Uno are now so cheap, it's difficult to save money by building your own. But the knowledge gained from assembling an Arduino from individual parts, makes the exercise well worthwhile.

ATmega328P Pin Mapping:

[nagygergely]

PART LIST:
(like this to keep on top)

1x ATMEGA328P chip with Ardunio bootloader
1x USB to TTL converter*
1x 100nF capacitor (-> USB-TTL converter)
1x 16MHz crystal oscillator
2x 20pF capacitor (-> crystal)
1x LED
1x 220 Ohm resistor (-> LED)

*Pay attention of your choice, it should have the same 6 pins as the one used here. Cheaper 5-pin versions do not have the CTS and required DTR pin.

[GeeTheBuilder]

I've watched a lot of videos on YouTube. But this is in the top 5 ever.

Brilliant video, brilliantly explained. I'm new to arduino and this showed me stuff I could easily understand and even more important, it got me more interested in learning more about electronics.

I don't comment much on videos. This deserved one. Love your videos and the way you explain in a logical way. Cheers.

[williamhayden]

And you (whomever chooses this path) learned a whole heck of a lot more building one than buying one. Nice job Julian!

[romanpirs]

I'm Mexican, but you explain very well and speak slow, so I understand. Excellent video at all.

[huchengguo]

Thank you for this video, Now i know that Arduino board is nothing but straight up wire from IC to pin headers (with protections). I have been dealing with the size of the Arduino for a long time, robots such as sumobots have very intense space requirements, This video has taught me to just draw a PCB with SMD ATmega chips, saves tonnes of spaces that was taken by headers. Great job!

[troyna]

you can always trust a person that sharpens his pencils by hand/knife. BTW... thanks.

[Slider]

Great explanation video.
It's like making a radio, can buy one for a quid, but making one teaches a whole lot more and removes a lot of mystery.

[arnoldr]

This is the kind of videos people need to see on YouTube, if there where a Youtube’s Oscar you definitely must win one

[ericmenaut]

Great explanation, with a clear and comprehensible language. Very appreciated when you see the tons of videos made by people who do not articulate and talk at the speed of a formula 1.

[beargun]

You also need to connect AVCC to 5V, or portC might not work properly (according to the data sheet).

I'd also strongly suggest connecting the two GND pins. A decoupling cap between GND and VCC would be advisable too.

You can print stickers that you can stick on the DIP package, that show the pinouts. Very handy, so you don't have to lookup the pinouts.

Great demo of the bare bones Atmega328 Julian. Thanks.

[Vhbaske]

That is good for a stand alone project. An alarm, clock, letter display, etc. You are a master tutor!

[MFGNEV]

I started now to use the Atmel328 directly on PCB and this tutorial was the base for it! Thanks a lot!
Only one remark: I was only able to upload a sketch via USB - TTL converter to the chip adding a 10K resistor between +5V and pin 1 (reset).

[robthom]

I always learn something from watching a video. Many good points in this one. Also, like the soldering of a resistor to the LED for prototyping. Never thought of this, but it makes breadboarding so much easier. Thanks,

[ShahZahid]

i had watched this video 6 years ago, i was really surprised to see this recommended to me, the god ol days, your channel really helped me getting started with Arduinos

[CariagaXIII]

its like art attack 2000s but for big boys.

[stoveman]

Great video. I just sourced parts to build my own Arduino. $5.94 for the parts. I already had the resister and LED. This is a well documented video with step by step instructions. Thanks for taking the time to post..

[Polite_Cat]

Really interesting project, julian. I always hope for a new of yours every day in my subscription list and always watch yours first! :) You are my favorite channel to watch right now.

[esquach]

I've seen this done several times, but nobody has been nearly as clear as you have been.  You're a fantastic instructor, so keep it up.  Thanks!

[rbaleksandar]

It's the amount of produced units that reduces the price. It is relatively rare for a custom assembled unit to cost equal or less than a premade one.

[FuzzyScaredyCat]

It's 2020 and this is the *only* video I've found that strips down what's required t the bare minimum. Thank you.