> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# Pro Micro - 3.3V/8MHz

**Type:** Product page · **SKU:** DEV-12587 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia)
**Page:** https://core-electronics.com.au/pro-micro-3-3v-8mhz.html ([markdown](https://core-electronics.com.au/pro-micro-3-3v-8mhz.html.md))

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.

## Pricing

- **Price:** $35.50 (inc GST) — $32.27 AUD, exc GST
- **Quantity discounts:** 5+ $31.31 (exc GST) · 25+ $30.65 (exc GST) · 100+ $29.36 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Aug 31 and Sep 03.

## How to buy

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- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

At SparkFun, they refuse to leave ‘good enough’ alone. That’s why they added to their 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. There is a voltage regulator on board so it can accept voltage up to 12VDC. If you’re supplying unregulated power to the board, be sure to connect to the “RAW” pin on not VCC.

Not sure which Arduino or Arduino-compatible board is right for you? Check out Sparkfun's [Arduino Buying Guide](https://www.sparkfun.com/arduino_guide)!

**Note:** See the GitHub link below for support with the Arduino IDE.

**Dimensions:** 1.3x0.7"

**Features:**

- ATMega 32U4 running at 3.3V/8MHz
- Supported under Arduino IDE v1.0.1
- 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!
 
**Documents:**

- [Schematic](https://core-electronics.com.au/attachments/localcontent/Pro_Micro_v13_714755f7317.pdf)
- [Eagle Files](https://core-electronics.com.au/attachments/localcontent/Pro_Micro_v13_1808485d3f3.zip)
- Hookup Guide
- [Datasheet](https://core-electronics.com.au/attachments/localcontent/ATMega32U4_90717eb6559.pdf) (ATMega 32U4)
- [Firmware Note](https://core-electronics.com.au/attachments/localcontent/32U4Note_302100bd229.pdf)
- [Arduino Addon Files](https://core-electronics.com.au/attachments/localcontent/master_754603faaec.zip)
- [GitHub](https://github.com/sparkfun/Pro_Micro) (Design Files)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/p/r/pro_micro_-_3.3v_8mhz__dev-12587__01.jpg)