Timing Pulley GT2 (30 Teeth-8 mm Inner Diameter-10mm Width) 4-8 coupler The sensitivity of the sensor

The sensitivity of the sensor can be adjusted by using the potentiometer

Excellent Pin Contact with Lever Closed

This little cable will bridge the two

This is a high quality  5V DC songle power relay

Operating voltage: 5V

Timing Pulley GT2 (30 Teeth-8 mm Inner Diameter-10mm Width) 4-8 coupler The sensitivity of the sensorThe GT2 pulley with 20 teeth or grooves is one of the best choices for 3d printer construction or XYZ linear motion for small CNC because the gt2 pulley tooth profile is anti backlash. Why? The rounded teeth of this tooth and belt are engaged together longer providing a smoother transition between teeth. This is what you need for your 3D printer or transmission mechanism. This pulley has 30 teeth, and a 8 mm inner bore. Two set screws can be used to