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Arduino MKR ZERO (I2S bus SD for sound, music digital audio data)
The Arduino MKR Zero brings 32-bit power to the compact MKR form factor, with the standout feature of an onboard SD card connector with dedicated SPI interfa...
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The Arduino MKR Zero brings 32-bit power to the compact MKR form factor, with the standout feature of an onboard SD card connector with dedicated SPI interface for playing music and audio files directly — no extra hardware needed. It also supports the I2S (Inter-IC Sound) bus for connecting digital audio devices.
Powered by the Atmel SAMD21 (32-bit ARM Cortex-M0+), the board can be powered via micro USB or a LiPo battery with built-in battery voltage monitoring through the onboard ADC.
Key Features
- Microcontroller – Atmel SAMD21 (32-bit ARM Cortex-M0+)
- SD Card Slot – Onboard with dedicated SPI1 interface
- I2S Bus – For digital audio device connections
- Operating Voltage – 3.3V
- Power – Micro USB or LiPo battery (with voltage monitoring)
- Form Factor – MKR (compact)
Ideal For
- Music and audio playback projects
- Digital audio processing with I2S
- Learning 32-bit ARM development
- Battery-powered portable audio devices
Package Contents
- 1× Arduino MKR Zero
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- ADC
- An analogue-to-digital converter reads a changing voltage and turns it into a number the microcontroller can use. It matters when connecting analogue sensors such as light, sound, or variable-resistor sensors.
- I2S
- I2S is a digital audio interface used to send sound data between chips, such as from a microcontroller to an audio amplifier or DAC. It matters if your project needs cleaner digital audio output than a basic buzzer or PWM signal can provide.
- LiPo
- A LiPo (lithium polymer) battery is a rechargeable lithium battery widely used in portable projects because it is light and compact. LiPo cells need correct charging circuitry and careful handling to stay safe, so equipment that supports LiPo generally includes charging or protection hardware suited to that battery type.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- SAMD21
- The SAMD21 is a Microchip (formerly Atmel) 32-bit Arm Cortex-M0+ microcontroller used in many Arduino-compatible boards. The exact chip affects which libraries, clock speeds and peripheral features are available, so software needs to support the SAMD21 specifically.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
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