Specification:

• Use LM393 Differential Comparator

• LED indicators

• Output 'H' when blocking; output 'L' when non-blocking

• Input voltage: DC3.3V ~ 5V

• Dimension: 3.2cm x 1.4cm

• Comes with mounting holes

Interface:

• VCC : Connect to DC3.3V ~ 5V

• GND : Connect to Ground

• DO : TTL output, 'H' when blocking; 'L' when non-blocking

• AO : Unused