Hi there,
Unfortunately, the Grove Shield for Arduino Nano is not supported for Arduino Nano 33 loT. This is because the VCC pins of these connectors are connected to the 5V Pin. While Arduino Nano 33 IoT is based on SAMD21, which IO is 3.3V, therefore the IO voltage does not match.
The good news is that you can cut off the wire and re-solder the VCC bus of the shield to the 3.3V pin of the Nano 33 board, then it should work. Please follow the steps below.
- Cut off the wire at the back of the shield, there are two rows of pins, cut off the connection between the two pins marked as 5V.
- Sold a jumper between the 3V3 pin and the outside 5V pin.
And we apology for the inconvenience. We designed this product at a time when the Arduino Nano 33 series was not yet released, so we did not do a level-compatible design. And thank you for posting to let us know about this problem, we’re considering making an upgrade version to support Arduino Nano 33 series.
We hope the solution works for you and thanks again.