*uino-32u4 is an Arduino compatible platform with very minimalistic features.
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The *uino-32u4 is derived from previous work done by:
- The Arduino team [http://arduino.cc/]
- The vinciDuiono team (fmalpartida - fm, Inizul, JMN, yOPERO, nayma, flico, josemanu and shaktale) [http://bitbucket.org/fmalpartida/vinciduino/wiki]
Also, many thanks to fm and CrossRoads and others on the Arduino forums for invaluable advise and discussion on an Atmel ATmega32u4 based board.
The board is based on the Arduino Leonardo and vinciDuino platforms. It shares the same Atmel ATmega32U4 microcontoller and utilizes the native USB feature of the ATmega32U4.
However, the mapping of microcontroller pins to analog and digital shield I/O is different. The goal of *uino-32u4 is to preserve the I2C and SPI pin configuration of the Adrduino UNO and like boards. It is also very minimalistic in features as it lacks any of the acustomed Arduino external power and power switching features. The board is intended to be powered via the USB port only.
Two headers for jumpers have been provided to select the function of the A4/A5 analog I/O pins and an alternate pin for LED L1. The extra ATmega32U4 pin has been routed to an additional LED L2. LED L2 fills in the role of the LED_BUILTIN.
The board is compatible with the Arduino Leonardo bootloader as currently in the Arduiono 1.0 relase IDE. To use this board the Leonardo has to be selected as board in the IDE. The pin mapping table shows how the Leonardo I/O labeling corresponds to *uino-32u4 I/O.
The board is supported in Arduino IDE 1.6.x via the core files available at: [https://github.com/adilinden/uino-arduino]
To install clone uino-arduino into the hardware folder inside your Sketchbook folder. The board will then automagically appear in the Boards menu.
This table provides a reference as to how the I/O pins of the *uino-32u4 map to the ATmega32u4 pins. It also shows the pin usage of the Leonardo/ vinciDuino boards for comparison.
*uino Leonardo ATmega32u4 *uino Function A0/D18 A0 36 - PF7 (ADC7) A1/D19 A1 37 - PF6 (ADC6) A2/D20 A2 38 - PF5 (ADC5) A3/D21 A3 39 - PF4 (ADC4) A4/D22 A4 40 - PF1 (ADC1) or 19 - PD1 (SDA/INT1) SDA / INT A5/D23 A5 41 - PF0 (ADC0) or 18 - PD0 (OC0B/SCL/INT0) SCL / INT D0 D0 20 - PD2 (RXD1/INT2) UART RX / INT D1 D1 21 - PD3 (TXD1/INT3) UART TX / INT D2 D13 32 - PC7 (ICP3/CLK/OC4A) PWM D3 D11 12 - PB7 (PCINT7/OC0A/OC1C) PWM D4/A6 D4 25 - PD4 (ICP1/ADC8) D5 D5 31 - PC6 (OC3A/OC4A) PWM D6/A7 D6 27 - PD7 (T0/OC4D/ADC10) PWM D7 D7 1 - PE6 (INT6/AIN0) D8/A8 D8 28 - PB4 (PCINT4/ADC11) INT D9/A9 D9 29 - PB5 (PCINT5/OC1A/OC4B/ADC12) PWM / INT D10/A10 D10 30 - PB6 (PCINT6/OC1B/OC4B/ADC13) PWM / INT D11 D16/ICSP 10 - PB2 (PCINT2/MOSI) SPI MOSI / INT D12 D14/ICSP 11 - PB3 (PCINT3/MISO) SPI MISO / INT D13 D15/ICSP 9 - PB1 (PCINT1/SCLK) SPI SCK / INT SDA/D14 D2 19 - PD1 (SDA/INT1) SCL/D15 D3 18 - PD0 (OC0B/SCL/INT0) PWM / INT D16 33 - PE2 (HWB) LED L1 D17 D12/A11 26 - PD6 (T1/OC4D/ADC9) LED L2 D30 TX 22 - PD5 TX LED D31 RX 8 - PB0 (PCINT0/SS) RX LED
Note that analog pins A0 to A10 also map to digital pins D18 to D29.