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This gives a software SPI example. I like the looks of it.
3. Use this to complete Neil's library.
At least i think I understand enough to know which way to go on this. It would be good to have
a simple nrf solution.s
###Jan 2019
Already started KICAD project to attach tiny44 to nrf24L01 in configuration that is compatible with RF24 libraries
but can also be used with software solutions. In fabClass2018/nrf24l01/rf24_tiny44.
- next step is to add a couple of pins to header, so I can use same header to program t44.
- alternatively, connect rst and unused IRQ position with a wire! I like this.
- would be good to add button as well. Could hack this in as well, I guess.
###Mar 2019
So far did not reproduce success with RF24 library.
See [this link](https://forum.arduino.cc/index.php?topic=217865.0) for some dead simple examples.
Suggest [tmrh20 branch of project](https://tmrh20.github.io/RF24/)
Try updating library using library manager.
Now, with wires in the right holes, and updated library, it works.
[rec](./Arduino_nrf/GettingStarted_rec/GettingStarted_rec.ino)
[xmit](./Arduino_nrf/GettingStarted_xmit/GettingStarted_xmit.ino)
Make simple program to send a byte.
[hookup instructions](http://tmrh20.github.io/RF24/)
Code revised from getting started examples:
[rec](./Arduino_nrf/Simple_rec/Simple_rec.ino)
[xmit](./Arduino_nrf/Simple_xmit/Simple_xmit.ino)
[good Instructable about nrf and Arduino](https://www.instructables.com/id/The-TRUTH-About-the-Nrf24L01-Transceiver/)
Jan 2020
Use both Adafruit M4 and SAMD11 with Mattair bootloader to run simple radio programs.
See files in ./Arduino_nrf.
Black gnd
Red 3.3V
Orange CE
Yellow CS (or SS)
Green SCK
Blue MOSI
Brown MISO
[M4 transmit program](./Arduino_nrf/Simple_xmit_M4/Simple_xmit_M4.ino)
[M4 receive program](./Arduino_nrf/Simple_rec_M4/Simple_rec_M4.ino)
]
Picture of board 
[Another interesting tutorial link:](https://lastminuteengineers.com/nrf24l01-arduino-wireless-communication/)
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