Teensy 4.1 Breakout Board (T41U5XBB) Resources
Prebuilt Firmware. No need to build from source code.
Assembling the T41U5XBB in pictures.
My Blog - many entries about CNC building with T41U5XBB.
grblHAL GitHub repository for those that want to build from source code. Start with the core section.
grblHAL Wiki General resource for grblHAL information.
grblHAL Issues To learn about or report problems.
grblHAL First Run Settings. Wiki entry for first time booting grblHAL.
grblHAL Discussions. Join in the discussion about new features. Ask questions.
ioSender. grblHAL aware GCode Sender. High quality and well maintained. Worth checking out.
ioSender Tour. Learn about ioSender, how to install and use.