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The Zero is a simple and powerful 32-bit extension of the platform established by the UNO. The Zero board expands the family by providing increased performance, enabling a variety of project opportunities for devices, and acts as a great educational tool for learning about 32-bit application development. The Zero applications span from smart IoT devices, wearable technology, high-tech automation, to crazy robotics. The board is powered by Atmel’s SAMD21 MCU, which features a 32-bit ARM® Cortex® M0+ core. One of its most important features is Atmel’s Embedded Debugger (EDBG), which provides a full debug interface without the need for additional hardware, significantly increasing the ease-of-use for software debugging. EDBG also supports a virtual COM port that can be used for device and bootloader programming.
Warning: Unlike most Arduino boards, the Zero runs at 3.3V. The maximum voltage that the I/O pins can tolerate is 3.3V. Applying voltages higher than 3.3V 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 AC-to-DC adapter or battery to get started. The Zero is compatible with all the shields that work at 3.3V and are compliant with the 1.0 Arduino pinout.
Getting Started
In the Getting Started section, you can find all the information you need to configure your board, use the Arduino Software (IDE), and start to tinker with coding and electronics. To keep your Zero's Bootloader up to date, the the Update Procedure explains what you should do each time there is a new Arduino SAMD Boards release.
ARM Core Benefits
The Zero has a 32-bit ARM core that can outperform typical 8-bit microcontroller boards. The most significant differences are:
For further information about the SAM-D21 microcontroller please refer to the datasheet.
Atmel Embedded Debugger
The Atmel Embedded Debugger (EDBG) implements a SWD interface in order to program the on-board SAMD21 and is also connected to one hardware serial of the microcontroller. This means that the 'Serial' class responds to the programming port of the board. The Zero has been designed in collaboration with ATMEL, and the on-board EDBG can be used through ATMEL Studio to get full access to the microcontroller memories to help debug your code.PowerThe Arduino Zero can be powered via the USB connector or with an external power supply. The power source is selected automatically.External (non-USB) power can come either from an AC-to-DC adapter (such as a wall-wart) or battery, and can be connected using a 2.1mm center-positive plug connected to the board's power jack, or directly to the GND and VIN pin headers of the POWER connector.The board can operate on an external supply of 6 to 20 volts. The recommended range is 7 to 12 volts.
The power pins are as follows:
Memory
The SAMD21 has 256 KB Flash Memory. It also has 32 KB of SRAM and up to 16 KB of EEPROM by emulation.
Input and Output
Each of the 20 general purpose I/O pins on the Zero can be used for digital input or digital output using pinMode(), digitalWrite(), and digitalRead() functions. Pins that can be used for PWM output are: 3, 4, 5, 6, 8, 9, 10, 11, 12, 13 using analogWrite() function. All pins operate at 3.3 volts. Each pin can source or sink a maximum of 7 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms.In addition, some pins have specialized functions
Burn the Bootloader
Using the Zero Programming Port it is possible to burn the booloader used by the Native USB port. To burn the bootloader follow this procedure:
USB Overcurrent Protection
The Zero has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed.The Zero has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed.
Programming
Uploading sketches to the SAMD21 is different from the AVR microcontrollers found in other Arduino & Genuino boards. Either USB port can be used for programming the board, although using the Programming port is recommended due to the way the erasing of the chip is handled:
Unlike other Arduino & Genuino boards which use avrdude for uploading, the Zero relies on bossac while the programming port uses openOCD .
JTAG connector for debugging through SWD
Another external debugger can be used by means of the on-board JTAG connector.
ICSP Connector used for SPI communication
Here are details of the SPI pins location within the ICSP connector: EEPROM
Part of the Flash memory may be used as a non-volatile storage with some limitations, the lifetime of the typical flash memory is about 25K write-cycles, and unlike EEPROM, and it must be erased in pages before writing. The flash memory is erased when you upload a new sketch.
Serial ports
Physical Characteristics
The maximum length and width of the Zero PCB are 2.7 and 2.1 inches respectively, with the USB connectors and power jack extending beyond the former dimension. Three screw holes allow the board to be attached to a surface or case. Note that the distance between digital pins 7 and 8 is 160 mil (0.16"), not an even multiple of the 100 mil spacing of the other pins. The Zero is designed to be compatible with most shields designed for the Uno, Diecimila or Duemilanove. Digital pins 0 to 13 (and the adjacent AREF and GND pins), analog inputs 0 to 5, the power header, and "ICSP" (SPI) header are all in equivalent locations. Further the main UART (serial port) is located on the same pins (0 and 1).
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