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Hi, I think you need to replace onewire library with the version mjrovai posted in step 7. It worked for me.
I made one also :) I used 2x 10 ohm resistors to get 600 - 700ma discharge.
It means you are missing U8glib library. Install that first.
Hi, you could just add pastebin link to your comment :)
ARDUINO SOLAR CHARGE CONTROLLER ( Version 2.0)
Building a Prusa i3 3D Printer