บอร์ด Pro Micro uses Atmega32U4's own USB update program 5V/16M MCU development board (Arduino-compatible board)

DESCRIPTION

The Pro Micro is an Arduino compatible board based on the ATmega32U4 and the smallest member of the Arduino family.  It is similar to the Arduino Micro, but it is even smaller.  It is breadboard friendly and the small size allows you to place the Pro Micro into your breadboard rather than jumpering from the board over to a breadboard.  The small size also makes them useful for embedding into a permanent project.

PACKAGE INCLUDES:

• Pro Micro 5V/16Mhz
• 2 x Male Header Strips

KEY FEATURES OF PRO MICRO 5V/16MHZ:

• ATmega32U4 processor running at 16MHz
• Built-in serial to USB converter
• 32KB Flash memory
• 12 Digital I/O
• 5 PWM shared with the digital I/O
• 9 Analog inputs that can also be used as digital I/O for a total of up to 20 digital I/O
• 1 Hardware serial port
• 5V Operation
• Extremely small size

The Micro Pro uses the same ATmega32U4 processor as used on the Leonardo boards.  The board has a USB Micro-B connector and the USB interface is contained within the ATmega32U4 chip and does not require a separate USB chip like most Arduino boards which helps to keep the size small.  The board also does away with the reset button and ICSP header to minimize the footprint.  If it is necessary to reset the board, the reset pin should be momentarily grounded.

The board operates at 5V which can be supplied via the Vcc pin or through the USB port connection.  If an external 7-12V power supply is used, the power should be input on the ‘RAW’ pin which feeds an on-board 5V regulator.  It is not recommended to use input voltages greater than 12V as it will cause the on-board regulator to work harder and may cause it to overheat.

There is a green power LED on the board and 2 red LEDs which show activity on the TX/RX lines.  There is no on-board general purpose LED.

Like all Arduino and compatible boards, it can be programmed using the Arduino IDE via the USB port.  To program with the Arduino IDE, use board type: ‘Leonardo’.

The board comes with 2 male header strips.  These do not come soldered for maximum flexibility depending on how the module will be used.  The headers can be optionally soldered onto the module if using with a breadboard.  If it is desired to solder on the headers, it is easiest if the headers are first placed into a solderless breadboard to hold them aligned while they are being soldered.

Pro Micro ATmega32U4 Pinout

ตัวอย่าง Code ทดสอบ Pro micro

โดยการกระพริบไฟ RX LED พร้อมกับ TX LED และพิมพ์ Hello world ออกทาง Serial monitor 

1. /* Pro Micro Test Code
2.    by: Nathan Seidle
3.    modified by: Jim Lindblom
4.    SparkFun Electronics
5.    date: September 16, 2013
6.    license: Public Domain - please use this code however you'd like.
7.    It's provided as a learning tool.
8.  
9.    This code is provided to show how to control the SparkFun
10.    ProMicro's TX and RX LEDs within a sketch. It also serves
11.    to explain the difference between Serial.print() and
12.    Serial1.print().
13. */
14.  
15. int RXLED = 17;  // The RX LED has a defined Arduino pin
16. // The TX LED was not so lucky, we'll need to use pre-defined
17. // macros (TXLED1, TXLED0) to control that.
18. // (We could use the same macros for the RX LED too -- RXLED1,
19. //  and RXLED0.)
20.  
21. void setup()
22. {
23.  pinMode(RXLED, OUTPUT);  // Set RX LED as an output
24.  // TX LED is set as an output behind the scenes
25.  
26.  Serial.begin(9600); //This pipes to the serial monitor
27.  Serial1.begin(9600); //This is the UART, pipes to sensors attached to board
28. }
29.  
30. void loop()
31. {
32.  Serial.println("Hello world");  // Print "Hello World" to the Serial Monitor
33.  Serial1.println("Hello!");  // Print "Hello!" over hardware UART
34.  
35.  digitalWrite(RXLED, LOW);   // set the LED on
36.  TXLED0; //TX LED is not tied to a normally controlled pin
37.  delay(1000);              // wait for a second
38.  digitalWrite(RXLED, HIGH);    // set the LED off
39.  TXLED1;
40.  delay(1000);              // wait for a second
41. }