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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?

2 Answers 2

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On any Arduino you can use any free digital pin as SPI CS.

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  • Okay. Thank you! Even the DI0 pin of RFM69HCW can I connect it too to any pins of Arduino Nano? Commented Mar 2, 2022 at 5:41
  • @lostresearch, why not? it is free. the SPI pins on Nano are 11, 12 and 13
    – Juraj
    Commented Mar 2, 2022 at 5:44
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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.

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