@sotidii said in LIS3DH +SAMMYC21(chip45)+Duet 3 Mini:
Is it possible to connect BLtouch to Sammyc21
Yes, it's possible. See the pin table at https://duet3d.dozuki.com/Wiki/Using_the_Sammy-C21_development_board_with_Duet_3#Section_Features_of_the_standard_firmware_binary. Pick a pin capable of PWM output for the servo control wire, and a pin capable of digital input for the input pin.