Connect nrf24l01+ to Sparkfun Pro Micro?

Wireless & IoT
1

I’m trying to connect this transceiver:

http://www.newegg.com/Product/Product.a … 27191035:s

to this microcontroller:

https://www.sparkfun.com/products/12640

PIN 7 (MISO)-> PIN 14

PIN 6 (MOSI) → PIN 16

PIN 5 (SCK) → PIN 15

PIN 4 (CSN) → ???

PIN 3 (CE) → PIN 3

PIN 1 (GND) → GND

PIN 2 (VCC)-> 3.3v voltage regulator → VCC

Where do I connect PIN 4? According to the Pro Micro pinout, there’s no SS/CS pin.

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https://dlnmh9ip6v2uc.cloudfront.net/as … 8b4567.png

2

CSN (pin 4) is discussed in the [NRF24L01 datasheet, starting on page 47. It can be connected to any pin as it can be set HIGH or LOW.](https://www.sparkfun.com/datasheets/Components/SMD/nRF24L01Pluss_Preliminary_Product_Specification_v1_0.pdf)