If your control board does not provide Servo Pin please change your code as below.

Please connect orange wire to the spare pin such as Endstops or Extensions pin (e. g : Xmax, Ymax, Zmax, etc.) and modify as following refer to pins_YourMotherboard.h

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■ MKS-Base V1.2 Wiring

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============== pins_RAMPS.h ===============

#define SERVO0_PIN 11

#define SERVO0_PIN 19 //BLTouch orange wire