Arduino Nano 33 IOT
Overview
The Arduino Nano 33 IOT is a small form factor development board with USB, Wifi, Bluetooth, a 6 axis IMU, and secure element.
Hardware
ATSAMD21G18A ARM Cortex-M0+ processor at 48 MHz
256 KiB flash memory and 32 KiB of RAM
One user LED
One reset button
Native USB port
Wifi and Bluetooth via a u-blox NINA-W102
ATECC608A secure element
LSM6DS3 six axis accelerometer and gyro
Supported Features
The arduino_nano_33_iot board supports the hardware features listed below.
- on-chip / on-board
- Feature integrated in the SoC / present on the board.
- 2 / 2
-
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files. -
vnd,foo -
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.
arduino_nano_33_iot/samd21g18a target
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M0+ CPU1 |
|
ADC |
on-chip |
Atmel SAM0 family ADC1 |
|
ARM architecture |
on-chip |
Atmel SAM0 multi-protocol (UART, SPI, I2C) SERCOM unit1 |
|
on-chip |
For locating the Device ID (serial number) on Atmel SAM0 devices1 |
||
Clock control |
on-chip |
Atmel SAM0 Main Clock Controller (MCLK)1 |
|
on-chip |
Atmel SAMD0 Generic Clock Controller (GCLK)1 |
||
Counter |
on-chip |
Atmel SAM0 basic timer counter (TC) operating in 32-bit wide mode2 |
|
DAC |
on-chip |
Atmel SAM0 family DAC1 |
|
DMA |
on-chip |
Atmel SAM0 DMA controller1 |
|
Flash controller |
on-chip |
Atmel SAM0 NVMC (Non-Volatile Memory Controller)1 |
|
GPIO & Headers |
on-chip |
SAM0 GPIO PORT node2 |
|
on-board |
GPIO pins exposed on Arduino Nano (R3) headers1 |
||
I2C |
on-chip |
Atmel SAM0 series SERCOM I2C1 |
|
Interrupt controller |
on-chip |
ARMv6-M NVIC (Nested Vectored Interrupt Controller) controller1 |
|
on-chip |
Atmel SAM0 series External Interrupt Controller1 |
||
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
on-board |
Group of PWM-controlled LEDs1 |
||
MTD |
on-chip |
Flash node1 |
|
on-board |
Fixed partitions of a flash (or other non-volatile storage) memory1 |
||
Pin control |
on-chip |
Atmel SAM0 PINMUX2 |
|
on-chip |
Atmel SAM0 Pinctrl Container1 |
||
PWM |
on-chip |
Atmel SAM0 TCC in PWM mode1 |
|
RTC |
on-chip |
Atmel SAM0 RTC1 |
|
Serial controller |
on-chip |
Atmel SAM0 SERCOM UART driver2 |
|
SPI |
on-chip |
Atmel SAM0 SERCOM SPI controller2 |
|
SRAM |
on-chip |
Generic on-chip SRAM description1 |
|
Timer |
on-chip |
ARMv6-M System Tick1 |
|
USB |
on-chip |
Atmel SAM0 USB in device mode1 |
|
Watchdog |
on-chip |
Atmel SAM0 watchdog1 |
|
Wi-Fi |
on-board |
ESP8266/ESP32 WiFi modem (AT Commands)1 |
Connections and IOs
The Arduino store [1] has detailed information about board connections. Download the schematic [2] for more detail.
System Clock
The SAMD21 MCU is configured to use the 8 MHz internal oscillator with the on-chip PLL generating the 48 MHz system clock. The internal APB and GCLK unit are set up in the same way as the upstream Arduino libraries.
Serial Port
The SAMD21 MCU has 6 SERCOM based USARTs. SERCOM5 is available on pins 1 and 2.
PWM
The SAMD21 MCU has 3 TCC based PWM units with up to 4 outputs each and a period
of 24 bits or 16 bits. If CONFIG_PWM_SAM0_TCC is enabled then LED0 is
driven by TCC2 instead of by GPIO.
SPI Port
The SAMD21 MCU has 6 SERCOM based SPIs. SERCOM1 is available on pins 1, 14, and 15.
USB Device Port
The SAMD21 MCU has a USB device port that can be used to communicate with a host PC. See the USB device support sample applications for more, such as the USB CDC-ACM sample which sets up a virtual serial port that echos characters back to the host PC.
Programming and Debugging
The Nano 33 IOT ships the BOSSA compatible UF2 bootloader. The bootloader can be entered by quickly tapping the reset button twice.
Additionally, if CONFIG_USB_CDC_ACM is enabled then the bootloader
will be entered automatically when you run west flash.
Flashing
Build the Zephyr kernel and the Hello World sample application:
west build -b arduino_nano_33_iot samples/hello_world
Connect the Nano 33 IOT to your host computer using USB
Connect a 3.3 V USB to serial adapter to the board and to the host. See the Serial Port section above for the board’s pin connections.
Run your favorite terminal program to listen for output. Under Linux the terminal should be
/dev/ttyACM0. For example:$ minicom -D /dev/ttyACM0 -o
The -o option tells minicom not to send the modem initialization string. Connection should be configured as follows:
Speed: 115200
Data: 8 bits
Parity: None
Stop bits: 1
Tap the reset button twice quickly to enter bootloader mode
Flash the image:
west build -b arduino_nano_33_iot samples/hello_world west flash
You should see “Hello World! arduino_nano_33_iot” in your terminal.