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OSOYOO Pro Micro ATmega32U4 5V/16MHz Module Board with 2 Row pin Header Replace with ATmega328 Pro Mini for Arduino

4.6 out of 5 stars 491 ratings

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Pro Micro board for Arduino

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GPU Clock Speed 16 MHz
Video Output Interface USB
Included Components Pin Header

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  • ATMega 32U4 running at 5V/16MHz
  • Supported under IDE v1.0.1
  • On-Board micro-USB connector for programming
  • 4 x 10-bit ADC pins
  • 12 x Digital I/Os
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  • OSOYOO Pro Micro ATmega32U4 5V/16MHz Module Board with 2 Row pin Header Replace with ATmega328 Pro Mini for Arduino
  • +
  • 22AWG Silicone Hook Up Wire (OD: 1.7 mm) - 22 Gauge Stranded Tinned Copper Wire with Silicone Insulation, 6 Colors (Black, Re
  • +
  • EDGELEC 120pcs Breadboard Jumper Wires 20cm Wire Length Optional Dupont Cable Assorted Kit Male to Female Male to Male Female
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  • Pin Header

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    OSOYOO Pro Micro ATmega32U4 5V/16MHz Module Board with 2 Row pin Header Replace with ATmega328 Pro Mini for Arduino

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    Customer reviews

    4.6 out of 5 stars
    4.6 out of 5
    491 global ratings

    Top reviews from the United States

    Reviewed in the United States 🇺🇸 on December 21, 2015
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    5.0 out of 5 stars A very cool, very tiny Arduino!
    By NightRunner417 on December 20, 2015
    I only just got two of these today and only just got it working a few minutes ago, so that's why the three stars. Don't take it personally or seriously - I have only run a simple LED flasher on it and don't have enough experience on it yet to rate it yet higher. I will add more to this review as I go along. Meanwhile, I will say this much:

    1) It's TINY, only 1/6th or less the size of my Sunfounder Mega 2560. The pin rows on both are splayed just enough to cause insert problems with my Global Specialties breadboards, but a little quick work needlenose pliers (only a few pins at once, moving along gently) straightened it up fine. Then, the big problem became insertion itself - the pins are quite thick and so many at once going into a good breadboard takes A LOT of force. Gotta push hard and wiggle over and over, it's a challenge.

    2) The driver was a little work to find but not terribly so. I use Windows 7 Professional 64 bit and I used the Win 7 driver from here:


    Worked right away, all I had to do was pick "Arduino Nano" from the Arduino Sketch program device list, and then I had to make sure to pick Com 5 from the ports list. After that, no problemo senior, BlinkWithoutDelay works perfectly on it. The onboard LED is tied to Digital 13 so it's a little different from the PWM Pin 13 that I am used to on my Mega, but whatever. One thing at a time, right?

    My first goal is to remove the Mega from my slowly developing SBM-19 Geiger Counter design, and replace it with one of these. So, let's upload the program (yes, you get to experience it right along with me, so wish me luck here...) and yay it's up there... and WOW, uses a lot more memory for the same program, but that's fine since I knew these have less than the Mega and there's still plenty left. Down the road, that may cramp my style with project but again, one thing at a time.

    Next step, removing the Mega and inserting the Nano between the Geiger pulse circuit and the 16x02 LCD. Here goes... Ok, everything is hopped over. I could get away with just two breadboards now I see but I have the Nano on it's own small one so whatever. It won't matter once I start making PCBs for this thing. Ready for power.... Using the mini USB on the Nano...And oh hell yes, LCD came right up and displaying fine. Geiger is registering clicks but it's way less sensitive. Cause is...low voltage on the Geiger circuit. Excessive loading on the Nano's 5V bus I'm sure. No problem, the device is meant to be powered from Li-Ion anyway, and the Arduino is meant to be powered from the Geiger and not the other way around. Everything is working, anyway. It's counting events and displaying them just like it should, the speaker is clicking, and the.... yes! The mode selector inputs for the speaker sound type and sample rate are working exactly the same as with the Mega. All that lacks in any way is just the 5V source coming from the Nano. That could be a PIA with certain things in future., but again... one thing at a time.

    Oops... I moved the Geiger +5VDC line from the "Vin" pin on the Nano to the "+5V" pin on the Nano. All better. The Geiger circuit now has about 4.98VDC on the positive rail and the counts are back up to 80 - 90 CPM which is just about spot on normal for these big SBM-19 tubes. With the "Vin" pin powering it, I was only getting about 3.5V or something, so the tube was getting probably only a couple hundred volts where it should be about 350VDC - 400VDC, thus the sensitivity was crap. .

    So there you go... I did my first work with it as I typed the review and notice, no major problems? Pretty nice, I like it. I adore the tiny size, and I can forgive it the lesser memory just for that. The Mega is a beast, but not great for compactness in a project. This bugger appears to work fine for less complicated designs, and the small footprint is really great.

    So, for now... you know what? Screw it. Gonna rate her higher. For now, four stars. Maybe I'll jump it up to 5 later after I've done more with it. :-)

    BTW I tried to catch the onboard LED flash in the picture but it's really fast... The Geiger pulse is scarcely 30ms wide. It's plenty visible to the eye, just hard to catch on the camera without doing crazy things with shutter speed.

    A little update - 12-22-15: I can now verify that Digital Input #13 DOES NOT LIKE 400VDC, lol. I slipped and shorted the frickin Geiger 400VDC supply line right to the D13 input line, like, nice goin' Ace. I actually saw the bright blue, tiny spark and heard a tiny "tick!" as well. After that, nooooo input from D13 at all. I think the rest of the board is just fine, because the program never stopped running, and all the functions still worked like the audio mode select and sampling rate select, but no counts. I shelved the damaged Nano unit for other things and dropped in my second Nano unit as a replacement. Flashed the Geiger program to it, and kept going with testing and development with no further problems. Was of course tough as hell to pull the bad one and tough as hell to put the new one in, but I knew that was coming and I deserved it for my stupid slip up. I also think the Nano deserves 5 stars now as an award for being wounded in combat, lol. Still loving these things, still thinking they work just great, and still looking forward to more projects and getting a few more so I can make full out dedicated devices out of the projects that go especially well. :-)
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    Reviewed in the United States 🇺🇸 on December 4, 2016
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    Top reviews from other countries

    Amazon Customer
    4.0 out of 5 stars May need expertise to get it running !
    Reviewed in Canada 🇨🇦 on December 21, 2016