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I tried to connect my RFM69HCW to Arduino Nano 33 BLE, so that I won't be needing a logic level shifter to downgrade the voltage, since Arduino Nano is already 3.3V. Upon checking its data sheet and pinout, I noticed there's no dedicated pin for CS (Chip Select).
Which pin should I use as CS in the Arduino Nano?
Which pin should I connect the DI0 pin of RFM69HCW in the Arduino Nano?
On any Arduino you can use any free digital pin as SPI CS.
There is no dedicated CS pin, and you can use any available Dx pin – which enables you, among other things, to have several devices on the same bus. The CS pin allows you to select (hence the S) the right device.
