(1) Incremental encoder - AliExpress US$0.7
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(2) 5V Smart Car Code Wheel Photoelectric Speed ​​Sensor - AliExpress US$3
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(3) 12mm Hollow Shaft Optical Rotary Encoder Incremental HTL Output Replacement hl420 1024 80S12-95 2048 1000 500 4 Commands - AliExpress US$130
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