Sensor adopts TCRT5000, which uses infrared light detection, high sensitivity, anti-interference and stable performance. Working voltage 3.3V - 5V (Note: The use of low power supply voltage, high power supply voltage, sensor life will be shorter, 5 volt power supply is the preferred power supply) Detected object, the final output signal level is low; not detected object, and the final output signal is high The TTL level sensor output can be connected directly to the microcontrollers IO port 3.3 volts or 5 volts A fixed holes for easy installation Specification: Material: electronic components Product detailed size: product size 9.7x 2cm / 3.82 x 0.79inch line length : 17.5cm / 6.89inch Wiring method: VCC VCC is the positive input port of the power supply, which can be connected to the voltage of 3.3V~5V. GND GND is the negative input of the power supply OUT1~5 OUT is the signal output port, which links the I/O port of the MCU