About BL Touch:
BLTouch is an auto-leveling sensor for 3D Printers that can precisely measure the tilt of the Bed surface. It could work with any kinds of bed materials, such as glasses, woods, metals, and so on.
To get the firmware to let the BLTouch working: https://www.creality.com/download
Applicable model: Ender-6
The main functions and controls of BLTouch are the same as the usual auto bed leveling sensor, which consists of an RC servo and microswitch. Thus, BLTouch can be applied on almost every board.
BLTouch is fulfilled with simple structure and high precision by using progressively designed solenoid and hall sensors. It aims for user convenience and enjoyable printing by adding many smart functions, such as self-test, alarm, alarm release & Touch Switch mode, Blue LED for servo signal indicating, and Z-probe (Zmin) Testing.
Self-test: The push pin operates two times in a test when the power is on.
Alarm: The LED light blinks if a problem was found on a self-test or during operation
Wiring defect indicator: Blue and Red LED for indicating wiring defects.