Arduino Micro Specifications/Functions
In this article, we will explain in detail the specifications and functions of Arduino Micro.
The Arduino Micro is a smaller Arduino board compared to the Arduino Uno. It can be used by inserting it directly into the breadboard.
Arduino Micro Specifications
|Tech Specs||Arduino Micro|
|Output Voltage||+5V, +3.3V|
|Digital I/O Pins||24|
|PWM Digital I/O Pins||7|
|Analog Input Pins||12|
|Analog Output Pins|
|Rated Current per Pin||40mA/Pin|
|Program Writing Pins||Micro USB Type-B|
For the specifications of Arduino boards other than Arduino Micro, please refer to the following article.
Arduino Micro Functions
Arduino Micro Appearance
Pin Header Placement/LED Placement
↑Click to enlarge.
The microcontroller of the Arduino Micro uses “ATmega32U4” from Microchip Technology(USA).
A microcontroller is a very important component in controlling electronic devices that correspond to the human “brain”.
In addition, various memories such as SRAM, Flash memory, and EEPROM are also built into the microcontroller.
By connecting the Arduino Micro to the USB port of your PC with a USB cable, you can communicate between the Arduino Micro and your PC.
Programs (sketches) created on the PC can be written to the Arduino Micro, and the Arduino Micro can be controlled from the PC via serial communication.
It also has the role of powering the Arduino Micro via USB, as it doesn't have a power jack like the Arduino Uno.
You can restart the Arduino Micro by pressing the reset button. Use this when you want to restart the program from the beginning or when the Arduino Micro behaves strangely.
|PWM||0 to +5V analog output|
Analog output by switching between 0V and +5V at high speed
PWM and serial communication are shared with digital I/O. You can specify which one to use in the program.
10-bit A/D converter(1step change every 4.8mV)
|TX||Serial data transmission|
|〃||RX||Serial data reception|
|〃||SDA||Serial data transmission/reception|
|SPI||SS||Select device to control|
|〃||MOSI||Master ⇒ Slave data transfer|
|〃||MISO||Slave ⇒ Master data transfer|
|Vin||The voltage input to "Vin" is output.|
Power can also be supplied from USB port.
|+5V||+5V voltage output|
|+3.3V||+3.3V voltage output|
|AREF||Analog input reference voltage (0 to +5V input),|
Not normally used
(Same function as "③Reset Button")
|ON||Lights up when the Arduino Micro is powered|
|TX||Blinks when sending via serial communication|
|RX||Blinks when receiving via serial communication|
|L||Connect to digital I/O No.13|
Arduino Micro has 4 LEDs(chip parts). The “L” of LED is connected to the 13th digital I/O, and can be lighted up by setting the 13th pin to HIGH (5V) in the program.
By connecting an ICSP-compatible writer(program writing device), you can write programs(sketches) directly to the “ATmega32U4”, which is an Arduino Micro microcontroller(microcomputer).
However, since you can usually write programs(sketches) via the USB port, I think that it is rarely used for writing purposes.
In addition, it can also be used as an SPI terminal.
How to get technical data for Arduino Micro
Various technical materials of Arduino Micro can be obtained from the official Arduino website.
- EAGLE FILES
- SCHEMATICS: PDF Format
- BOARD SIZE Data: DXF Format
- FRITZING FILE
First, go to the Arduino official website from the link below.
Click each icon to download the “EAGLE FILES”, “SCHEMATICS”, “BOARD SIZE Data”, and "FRITZING FILE".