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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Jenny
Massapequa, US
★★★★★ 5
Very pretty
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Pretty spray glitter. Sprayed it in my braids and it lasted all day.
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Reviewed in the United States on March 7, 2026
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Piink coco
Carnegie, US
★★★★★ 1
NOOOO
Color: Gold
Do not buy !!! The glitter does not show up at all not sure if it’s because we are a darker skin tone but it’s a waste and it smells bad
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Reviewed in the United States on February 10, 2025
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Izzy
Waukegan, US
★★★★★ 5
Perfect shimmer!
Color: Gold
Adds just the right shimmer for, well, anything! I know I don’t need a reason to shine! Love my glitter!
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Reviewed in the United States on October 10, 2025
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remus
Belleville, US
★★★★★ 4
maybe im just extra
Color: Silver
decent glitter spray, although it gives a more subtle look than i was going for. perhaps for someone less dramatic!
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Reviewed in the United States on April 8, 2025
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Lisa
Grantham, US
★★★★★ 5
Love love love
Color: Gold
So happy with this product. Shine bright like a glitter ball. The smell is delicious. ☺️
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Reviewed in the United States on March 5, 2025

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