sparkfun Qwiic Pro Micro USB-C Document technique
Qwiic Pro Micro USB-C (ATmega32U4) Hookup Guide
Introduction
Heads up! This is for the Qwiic Pro Micro USB-C (ATmega32U4) version. If you are looking for
information about hardware on the Pro Micros with the micro-b USB connector, make sure to check out the
older Pro Micro & Fio V3 Hookup Guide.
The SparkFun Qwiic Pro Micro USB C is a really cool, little development board. It's an Arduino-compatible
microcontroller, micro-sized, and it accomplishes with one single chip what old Arduino Unos, Duemilanoves, and
Diecimeillas could never dream of: true USB functionality. In this tutorial, we'll check out the updated Qwiic Pro
Micro and go through a few examples to get you started!
SparkFun Qwiic Pro Micro - USB-C (ATmega32U4)
DEV-15795
Product Showcase: SparkFun Qwiic Pro MicroProduct Showcase: SparkFun Qwiic Pro Micro
Required Materials
To follow along with this tutorial, you will need the following materials at a minimum. You may not need everything
though depending on what you have. Add it to your cart, read through the guide, and adjust the cart as necessary.
Tools
You will need a soldering iron, solder, and general soldering accessories for a secure connection when using the
plated through hole pads.
SparkFun Qwiic Pro Micro - USB-C
(ATmega32U4)
DEV-15795
Reversible USB A to C Cable - 0.8m
CAB-15425
Soldering Iron - 60W (Adjustable Temperature)
TOL-14456
Solder Lead Free - 15-gram Tube
TOL-09163
Prototyping Accessories
Depending on your setup, you may want to use IC hooks for a temporary connection. However, you will want to
solder header pins to connect devices to the plated through holes for a secure connection.
For those that want to take advantage of the Qwiic enabled devices, you'll want to grab a Qwiic cable.
Breadboard - Self-Adhesive (White)
PRT-12002
Break Away Headers - Straight
PRT-00116
IC Hook with Pigtail
CAB-09741
Photon Stackable Header - 12 Pin
PRT-14322
SparkFun Qwiic Cable Kit
KIT-15081
Qwiic Cable - 100mm
PRT-14427
Suggested Reading
If you aren't familiar with the Qwiic system, we recommend reading here for an overview if you decide to take
advantage of the Qwiic connector.
Qwiic Connect System
We would also recommend taking a look at the following tutorials if you aren't familiar with them.
Qwiic Cable - Breadboard Jumper (4-pin)
PRT-14425
Qwiic Cable - 500mm
PRT-14429
Serial Communication
Asynchronous serial communication concepts: packets,
signal levels, baud rates, UARTs and more!
What is an Arduino?
What is this 'Arduino' thing anyway?
Installing Arduino IDE
A step-by-step guide to installing and testing the
Arduino software on Windows, Mac, and Linux.
Hardware Overview
Before we get into installing and using the Qwiic Pro Micro, let's quickly look at the board -- examine its inputs,
outputs, and other hardware quirks.
Old School to New School
The Qwiic Pro Micro USBC is a revision of the original Pro Micro. Overall, it is functionally the same as the
previous version. The board is the same size as the original Pro Micro but we added a few additional features by
shrinking down some components on the board. The major changes to the board that you will notice include:
Reset Button
USB C
Castellated Pads
Qwiic Connector
AP2112 3.3V Voltage Regulator
The benefit of the reset button is to quickly reset the board or place it into bootloader mode without the need to
take out a piece of jumper wire. The USB micro-b connector has been replaced with the USB type C connector.
The through hole pads have castellated edges for each pin to add a lower profile in your projects should you
decide build it into another assembly during production. Finally, a Qwiic connector is populated on the bottom of
the board to easily add Qwiic enabled I C devices.
Older 5V/16MHz
Pro Micro
Newer 5V/16MHz
Qwiic Pro Micro USB C
A subtle difference that you may not notice is the old Pro Micro used the MIC5219, which was able to handle a
maximum voltage input of 16VDC. The new Qwiic Pro Micro uses the AP2112 3.3V voltage regulator which can
handle a maximum of 6V. The output current is slightly higher in the Qwiic Pro Micro which peaks at about
600mA. You'll need to make sure to use an appropriate voltage regulator and components and regulate the
voltage down.
2
For more information about the differences between the boards, make sure to pull up the schematic for both
boards and read further below!
The Pinout
All of the Qwiic Pro Micro's I/O and power pins are broken out to two, parallel headers. Some pins are for power
input or output, other pins are dedicated I/O pins. Further, the I/O pins can have special abilities, like analog input.
Here's a map of which pin is where, and what special hardware functions it may have:
Click on image for a closer view
Power
There are a variety of power and power-related nets broken out to connectors and through hole pads. Each pad
has a castellated edge. The back of the board also has the USB pins broken out for power.
Castellated Power and Reset Pins USB Power Pins
These nets consist of the following:
V is the voltage provided from the USB connector.
RAW is the unregulated voltage input for the Qwiic Pro Micro. If the board is powered via USB (i.e. V), the
voltage at this pin will be about 4.8V (USB's 5V minus a Schottky diode drop). On the other hand, if the
board is powered externally, through this pin, the applied voltage can be up to 6V.
5V is the voltage supplied to the on-board ATmega32U4. This voltage will depend on whether you have the
jumper set to 5V (by default) or 3.3V.
When the jumper is set to 5V, it is the voltage applied to the RAW pin. We suggest using a clean 5V
power supply if you are connecting 5V devices to the I/O. If the board is powered through the 'RAW'
pin (or USB), this pin can be used as an output to 5V supply other devices.
When the jumper is set to 3.3V, the output is 3.3V. If the board is powered through the 'RAW' pin (or
USB), this pin can be used as an output to 3.3V supply other devices.
RST can be used to restart the Qwiic Pro Micro. There is a built-in reset button to reset the Pro Micro.
However, the pin is broken out if you need to access this pin externally. This pin is pulled high by a 10kΩ
resistor on the board, and is active-low, so it must be connected to ground to initiate a reset. The Qwiic Pro
Micro will remain "off" until the reset line is pulled back to high.
GND, of course, is the common, ground voltage (0V reference) for the system.
I/O Pins
The Qwiic Pro Micro breaks out the I/O pins to plated through hole pads on the edge of the board. Each pad is
castellated as well. On the back, there are additional pins to connect to the USB data pins.
Castellated I/O PTH Pads USB Pads
The Pro Micro's I/O pins -- 18 in all -- are multi-talented. Every pin can be used as a digital input or output, for
blinking LEDs or reading button presses. These pins are referenced in the Arduino IDE via an integer value
between 0 and 21. (The A0-A3 pins can be referenced digitally using either their analog or digital pin number).
Nine pins feature analog to digital converters (ADCs) and can be used as analog inputs. These are useful for
reading potentiometers or other analog devices using the analogRead([pin]) function.
There are five pins with pulse width modulation (PWM) functionality, which allows for a form of analog output
using the analogWrite([pin], [value]) function. These pins are indicated on-board with a faint, white circle
around the square pads.
There are hardware UART (serial), I C, and SPI pins available as well. These can be used to interface with digital
devices like serial LCDs, XBees, IMUs, and other serial sensors.
2
The Pro Micro has five external interrupts, which allow you to instantly trigger a function when a pin goes either
high or low (or both). If you attach an interrupt to an interrupt-enabled pin, you'll need to know the specific interrupt
that pin triggers: pin 3 maps to interrupt 0 (INT0), pin 2 is interrupt 1 (INT1), pin 0 is interrupt 2 (INT2), pin 1 is
interrupt 3 (INT3), and pin 7 is interrupt 4 (INT6).
On-Board LEDs
There are three LEDs on the Pro Micro. One red LED indicates whether power is present. The other two LEDs
help indicate when data is transferring over USB. A yellow LED represents USB data coming into (RX) the Pro
Micro, and a green LED indicates USB data going out (TX).
Jumpers
On the back of the board is a jumper that is able to select the system voltage. The default voltage for the board
defautls to 5V. By cutting the jumper pad and adding a solder to the between the center and right jumper pads, the
system voltage will be set to 3.3V.
Board Dimensions
The board measures 1.30" x 0.70". Not included in the image below is the PCB thickness, which is 0.8mm. This is
thinner than a majority of the PCBs used for SparkFun original designs.
How to Power the Qwiic Pro Micro USB C
As the Pro Micro's main feature is its innate USB functionality, the most common way to power it is via USB. If the
jumper is set to the default 5V, the Qwiic Pro Micro will be powered directly from the USB bus. If the jumper is set
to 3.3V, the board will regulate the 5V supply coming in from USB down to 3.3V. The other end of the USB cable
can be connected to either a computer, USB hub, USB batteries, or a USB wall adapter, which can (in most cases)
provide more power.
Alternatively, if your Qwiic Pro Micro is living out in the wild, out of reach of USB cables, it can be powered through
either the 'RAW' or '5V' pins. A supply going into those pins will provide power to the Qwiic Pro Micro. To be safe, it
shouldn't be any higher than 6V. If the jumper is set to 3.3V, the voltage will be regulated down to 3.3V.
How, exactly, you power your project is up to you and the demands of your project. If you're making something
battery powered, you could use a LiPo boost converter to power the board at 5V. Or you may want to set the
jumper to 3.3V, which could be powered by a LiPo battery or a couple alkalines. Make sure to check out the
following tutorials for more information.
Battery Technologies
FEBRUARY 6, 2013
The basics behind the batteries used in portable electronic devices: LiPo, NiMH,
coin cells, and alkaline.
Hardware Hookup
Header pins were left off the Qwiic Pro Micro to allow users the flexibility of connecting any type of 0.1" header to
the board. For temporary connections to the I/O pins, you could use IC hooks to test out the pins. However, you'll
need to solder headers or wires of your choice to the board for a secure connection. For advanced users, you
could also design a PCB to take advantage of the castellated edges for a lower profile. Here are a few tutorials to
connect to the pads depending on your personal preference.
How to Power a Project
FEBRUARY 7, 2013
A tutorial to help figure out the power requirements of your project.
How to Solder: Through-Hole Soldering
SEPTEMBER 19, 2013
This tutorial covers everything you need to know about through-hole soldering.
Ce manuel convient aux modèles suivants
2
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