Module Features: 

1.the use of imported slot optocoupler sensor, slot width 5mm. 

2.the output status indicator, the output high-level lights off, the output low-level lights. 

3.a block, the output high; no shelter, the output low. 

4.he comparator output, the signal clean, good waveform, driving ability, more than 15mA. 

5.the working voltage of 3.3V-5V 

6.the output form: digital switch output (0 and 1)

 7.with a fixed bolt hole, easy to install 

8.the small board PCB size: 3.2cm x 1.4cm 

9.the use of wide voltage LM393 comparator Module 

Instructions: 

1. No block in the module slot, the receiver tube conduction, the module DO output low, block, DO output high.

2. DO output interface can be directly connected with the single-chip IO port to detect whether the sensor block, such as electricity Machine code plate can detect the motor speed. 3. Module DO can be connected with the relay to form a limit switch and other functions, can also be active buzzer module Connected to form the alarm. Product wiring instructions: 1.VCC then the power supply positive 3.3-5V 2.GND connected to the negative power supply.

3.DO TTL switch signal output 

4.AO This module does not work