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I think you'll find Step 3 item 3 indicates another NANO/UNO and nRF24L01 for pairing i.e. to become the receiver unit.Aye Kim
Just thought I'd add that due to Codebender having closed the library referred to can be found at the Arduino official site by searching for libraries and then choosing the officially recognised other libraries and "SevenSeg" is included there, as an updated version too.
It is very easy to just copy and paste the code BUT doing that also copys spaces and unseen asci code as well. You need to go through the sketch and backspace any spaces and then re-introduce them with the space or tab key.Also before that move all curly brackets to new lines using the return key and that way you can see the code packets and not delete tham in error.I know, been there and got the T shirt.
Motion Following Robot
I use the same principle on posts hammered in the ground without any concrete. Just tie a diagonal lashing (where your metal pin is positioned) about the lever and post, then add a fulcrum and step gently on the lever, once the post is moving, untie and pull out. Like popping teeth. Well done, like the way you handled the awkward post, there's always one.
At last, have ironed out my problems and with mjrovai's help got the sketch into the MEGA via the Codebenders website. A minor bug found, the schematic in the pdf has an error, the signal lead for the base goes to pin 3 and DB4 from the LCD goes to PIN 2 which is correct in the sketch data.
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