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Controller : KS0066U
This is what you need for your 3D printer or transmission mechanism
Fast response and High sensitivity
External Depth: 8
The GT2 pulley with 36 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
Smoke sensor MQ2 (Digital/Analog) data transmission Controller : KS0066UThis smoke sensor module with MQ2 Smoke sensor have both digital and analog outputs , you also can adjust the sensitivity with the potentioneter. PIN Connection 4 pins as follows: VCC (5 V) GND (ground) Aout (Analog output) Dout (Digital output) When connect to arduino, use digital pins in digital mode (high or low) and use analog pins for analog mode (diffrenet value for different smoke intensity).