SKU: 20144093621

Arduino Pro Micro - 3.3V-8MHz

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Description

Arduino Pro Micro - 3.3V-8MHzsku: DEV 12587 Here at SparkFun, we refuse to leave 'good enough' alone. That's why we're adding to our line up of Arduino compatible microcontrollers once more! The Pro Micro is similar to the Pro Mini except with an ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connectivity on board and do away with bulky external USB interface. This tiny little board does all of the neat o Arduino tricks that you're familiar with: 4

sku: DEV-12587  

Here at SparkFun, we refuse to leave 'good enough' alone. That's why we're adding to our line-up of Arduino-compatible microcontrollers once more! The Pro Micro is similar to the Pro Mini except with an ATmega32U4 on board. The USB transceiver inside the 32U4 allows us to add USB connectivity on-board and do away with bulky external USB interface.

This tiny little board does all of the neat-o Arduino tricks that you're familiar with: 4 channels of 10-bit ADC, 5 PWM pins, 12 DIOs as well as hardware serial connections Rx and Tx. Running at 8MHz and 3.3V, this board will remind you a lot of your other favorite Arduino-compatible boards but this little guy can go just about anywhere.

This is the 3.3V version so, as always, keep in mind the limits of system voltage and so forth. The lower system voltage also has its advantages, though, like ease of use with many common 3.3V sensors.

Note: This board uses a modified version of what's known as the "diskloader" bootloader. This bootloader is still in its infancy so expect some glitchiness here and there. Also, because it works over HID you will need to install some drivers so that your computer will recognize it. A "readme" file in the driver pack below explains how to do this. Also, you'll need to unzip the "add-on" files below into a "hardware" directory inside your Arduino sketchbook (more detail in the readme). This will add the "SparkFun Pro Micro 3.3V/8MHz" option to the board selection menu.

Features
  • ATMega 32U4 running at 3.3V/8MHz
  • On-Board micro-USB connector for programming
  • 4 x 10-bit ADC pins
  • 12 x Digital I/Os (5 are PWM capable)
  • Rx and Tx Hardware Serial Connections
  • Our Smallest Arduino-Compatible Board Yet!
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SKU: 20144093621

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Great retinol face moisturizer
Palmers always makes a great product in my opinion. This one's no different. It's a retinol that doesn't irritate my skin. I use a moisturizer below and on top. It absorbs quickly but doesn't sit on the skin. It's helped with my fine lines quicker than other products I've used and the price point is unmatched. Great product,not a strong scent, will continue to use.
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Reviewed in the United States on January 10, 2026
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Renee W.
Charlottesville, US
★★★★★ 5
Very Good
Why did you pick this product vs others?: I have been using this product for 2 days and can see a difference in the appearance of my skin. 40+ this does help with fine lines. I can already see my smile lines appearing less noticeable. A little goes a long way. You don't need to use a lot, or it will look like clown makeup, and you will have to work it in, but it is not a big deal. Also, if you have sensitive skin, I wouldn't buy a product clearly listed as extra strength. It will work as an extra strength product.
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Reviewed in the United States on July 6, 2025
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evelyn milton
Draper, US
★★★★★ 4
Works but it takes time
It does work but takes a few months to get results.
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Reviewed in the United States on January 15, 2026
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Amazon Customer
Massapequa, US
★★★★★ 5
Amazing!!!!!!!
I love it , love it this is so good first purchase was $ 11.00 now is almost $20.00 this shows how good it is .
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Jerrell Cooper
San Leandro, US
★★★★★ 3
Terrible
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Reviewed in the United States on November 25, 2025

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