Arduino Nano 33 IoT
This small, robust and powerful board has WiFi and Bluetooth connectivity that combined with its low power architecture makes it a practical and cost-effective solution for your connected projects.
The Nano33 IoT is fully compatible with the Arduino IoT Cloud and supports full TLS secure transport: the ATECC608A cryptochip stores the cryptographic keys in hardware, offering a very high level of security for this class of products. The integration with the Arduino IoT Cloud offers a very efficient way of setting up online dashboards with little coding and minimal effort.
The same iconic size of the Arduino Nano, the 33 IoT hosts an Arm Cortex-M0+ SAMD21 processor, a WiFi and Bluetooth module based on ESP32, a 6 axis Inertial Measurement Unit (IMU) and a crypto chip which can securely store certificates and pre-shared keys.
The board can either be used in a breadboard or as a SMT module, directly soldering it via the castellated pads.
Please note: Arduino Nano 33 IoT only supports 3.3V I/Os and is NOT 5V tolerant so please make sure you are not directly connecting 5V signals to this board or it will be damaged. As opposed to Arduino Nano boards that support 5V operation, the 5V pin does NOT supply voltage but is rather connected, through a jumper, to the USB power input.
5V on that pin is available only when two conditions are met: you make a solder bridge on the two pads marked as VUSB and you power the NANO 33 IoT through the USB port. If you power the board from the VIN pin, you won’t get any regulated 5V and therefore even if you do the solder bridge, nothing will come out of that 5V pin. The 3.3V, on the other hand, is always available and supports enough current to drive your sensors.
This board is based on the SAMD21G18A microcontroller with these specs
- Clock: up to 48Mhz
- Flash: 256KB
- SRAM: 32KB
Communication on WiFi and Bluetooth is managed by a NINA W102 ESP32. The module is connected to the SAMD21 microcontoller with an SPI BUS and a serial port through the following:
|SAMD21 Pin||SAMD21 Acronym||NINA Pin||NINA Acronym||Description|
|23||PA14||28 / 21||GPIO5/GPIO19||SPI CS / UART RTS|
|24||PA15||29 / 20||GPIO18 / GPIO22||SPI CLK / UART CTS|
|31||PA22||23||GPIO3||Processor TX -> Nina RX|
|32||PA23||22||GPIO1||Nina TX -> Processor RX|
Some of the NINA W102 pins are connected to the 15+15 pins headers/pads and can be directly driven by the module's ESP32; in this case, it is necessary that the SAMD21 corresponding pins are aptly tri-stated.
|SAMD21 Pin||SAMD21 Acronym||NINI Pin||NINA Acronym||Header Description|
|8||PB09||31||GPIO33||A5 / SCL|
|7||PB08||35||GPIO5 / GPIO19||A4 / SDA|
The IMU is LSM6DS3 and it is managed through I2C.
The crypto chip is an ATECC608A and has a supporting library used by the WiFiNINA library.
The board has a two 15 pins connectors, one on each side, pin to pin compatible with the original Arduino Nano.
|1||D13/SCK||Digital||SPI SCK; GPIO|
|2||+3V3||Power Out||Internally generated power output to external devices|
|3||AREF||Analog||Analog Reference; can be used as GPIO|
|4||A0 / DAC0||Analog||ADC in / DAC out; can be used as GPIO|
|5||A1||Analog||ADC in; can be used as GPIO|
|6||A2||Analog||ADC in; can be used as GPIO|
|7||A3||Analog||ADC in; can be used as GPIO|
|8||A4 / SDA||Analog||ADC in; I2C SCL; can be used as GPIO*|
|9||A5 / SCL||Analog||ADC in; I2C SCL; can be used as GPIO*|
|10||A6||Analog||ADC in; can be used as GPIO|
|11||A7||Analog||ADC in; can be used as GPIO|
|12||VUSB||Power In / Out||Normally NC ; can be connected to VUSB pin of the USB connector by shorting a jumper|
|13||RST||Digital In||Active low reset input (duplicate of pin 18)|
|15||VIN||Power In||Vin Power Input|
|16||TX||Digital||USART TX; can be used as GPIO|
|17||RX||Digital||USART RX; can be used as GPIO|
|18||RST||Digital||Active low reset input (duplicate of pin 13)|
|21||D3 / PWM||Digital||GPIO; can be used as PWM|
|23||D5 / PWM||Digital||GPIO; can be used as PWM|
|24||D6 / PWM||Digital||GPIO; can be used as PWM|
|27||D9 / PWM||Digital||GPIO; can be used as PWM|
|28||D10 / PWM||Digital||GPIO; can be used as PWM|
|29||D11 / MOSI||Digital||SPI MOSI; can be used as GPIO|
|30||D12 / MISO||Digital||SPI MISO; can be used as GPIO|
(*), As opposed to other Arduino Nano boards, pins A4 and A5, have an internal pull-up and default to be used as an I2C Bus so used as analog inputs is not recommended.
On the bottom side of the board, under the communication module, debug signals are arranged as 3x2 test pads with 100 mil pitch. Pin 1 is the bottom left one with the USB connector on the left and the test pads on the right.
|1||+3V3||Power Out||Internally generated power output for voltage reference|
|2||SWD||Digital||SAMD11 Single Wire Debug Data|
|3||SWCLK||Digital In||SAMD11 Single Wire Debug Clock|
|4||UPDI||Digital||ATMega4809 update interface|
|6||RST||Digital In||Active low reset input|