I tried to power supply my arduino Nano 33 BLE sense.
When I send power into the VIN (3.7V and 250mAh), the board starts, and launches my program normally.
However, after 10 seconds, the board restarts, whatever the program I use.
Does anyone knows why ?
the minimum for Vin is 4.5 V
The spec sheet implies that the minimum input to Vin is 4.5V, but I don't see that explicitly stated anywhere. (under Documentation, in the pdf datasheet, there is a mention of the required voltage on the USB because it feeds Vin though a diode, where it states Vin has a 4.5V minimum).
Ok, but the board shouldn't start at all right ? Why does it work for 10 seconds then restarts ?
Your battery is flat?
Try measuring the voltage on your battery while the code is running. You might see it collapse over that 10 seconds period.
Otherwise post your schematic and code of what you are doing.
The board input is designed with MPM3610 step down converster with 3.9V typical "VIN Under-Voltage Lockout", check https://content.arduino.cc/assets/NANO33BLE_V2.0_sch.pdf and https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MPM3610GQV-Z/document_id/2090
So use at least 5V input.
@Grumpy_Mike had the good intuition. It works with another battery (also 3.7V and 250mAh)
Thank all of you for your answers.
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