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if you have an UNO with GRBL compatible shield you can use the “GRBL” pinout Estlcam offers.
The GRBL layout is fully functional including limit switches and probe input.
Be a bit careful though which GRBL version your shield is made for – the old one without PWM (use “GRBL” pinout) or the new one with PWM (use “GRBL PWM” pinout). If you’re not sure use “GRBL safe” which is somewhat limited but without risk of messing up controller pins.