![]() Blue LED: emission of infrared radiation.LM393 dual comparator to compare the signal created by the IR receiver with the predefined value through the potentiometer and to control the status of the LED that indicates the status of the digital output.The TCRT5000 module with analog output has to capacitors to increase the voltage stability.Multiple resistors to prevent LEDs for too high voltages and to operate as voltage dividers.The KY-033 has only one red LED that shows the status of the digital output. 2 LEDs to indicate that the module is operating (LED1) and to indicate the status of the digital pin (LED2).Potentiometer to define a threshold for the digital output pin.D0/S: Digital output based on a predefined threshold through the potentiometer and the operation voltage of the microcontroller.VCC/V+: Pin for the 3.3V or 5V operation voltage regarding to the technical datasheet. ![]() GND/G: Ground to connect the tracking sensor to ground with the microcontroller.A0 (not for the KY-033): Analog pin to transfer an analog signal.3 to 4 output pins that connect the TCRT5000 module to a microcontroller, like the Arduino, ESP8266 or ESP32.
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