To avoid such risk with existing projects, where you should be able to pull out a Nano and replace it with the new Nano 33 BLE we have the 5V pin on the header, positioned between RST and A7 that is not connected as default factory setting. Connecting higher voltage signals, like the 5V commonly used with the other Arduino boards, will damage the Arduino Nano 33 BLE. Care must be taken when connecting sensors and actuators to assure that this limit of 3.3V is never exceeded. The microcontroller on the Arduino Nano 33 BLE runs at 3.3V, which means that you must never apply more than 3.3V to its Digital and Analog pins. Here you will find the technical specifications for the Arduino® Nano 33 BLE.
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