Arduino MKR ZERO (I2S bus & SD for sound, music & digital audio data)

The MKR ZERO brings you the power of a Zero in the smaller format established by the MKR form factor. The MKR ZERO board acts as a great educational tool for learning about 32-bit application development. It has an on-board SD connector with dedicated SPI interfaces (SPI1) that allows you to play with music files with no extra hardware. The board is powered by Atmel's SAMD21 MCU, which features a 32-bit ARM Cortex M0+ core.

Warning: Unlike most Arduino and Genuino boards, the MKR ZERO runs at 3.3 V. The maximum voltage that the I/O pins can tolerate is 3.3 V. Applying voltages higher than 3.3 V to any I/O pin could damage the board.

The board contains everything needed to support the microcontroller; simply connect it to a computer with a micro-USB cable or power it with a LiPo battery. The battery voltage can also be monitored since a connection between the battery and the analog converter of the board exists.

• Microcontroller: SAMD21 Cortex-M0+ 32 bit low-power ARM MCU
• Board power supply (USB/VIN): 5 V
• Supported battery: Li-Po single cell, 3.7 V, 700 mAh minimum
• DC current for 3.3 V pin: 600 mA
• DC current for 5 V pin: 600 mA
• Circuit operating voltage: 3.3 V
• Digital I/O pins: 22
• PWM pins: 12 (0, 1, 2, 3, 4, 5, 6, 7, 8, 10, A3 or 18, A4 or 19)
• UART: 1
• SPI: 1
• I2C: 1
• Analog input pins: 7 (ADC 8/10/12 bit)
• Analog output pins: 1 (DAC 10 bit)
• External interrupts: 8 (0, 1, 4, 5, 6, 7, 8, A1 or 16, A2 or 17)
• DC current per I/O pin: 7 mA
• Flash memory: 256 KB
• Flash memory for bootloader: 8 KB
• SRAM: 32 KB
• EEPROM: no
• Clock speed: 32.768 kHz (RTC), 48 MHz
• Built-in LEDs: 32
• Full-speed USB device and embedded host.