Phototransistor Arduino, Which circuit is suitable for you?

In this video we will discuss phototransistor circuits. From the various circuits available, I chose these two circuits for us to test to find out the results of the analog read on the Arduino microcontroller.

Make sure the voltage supply to the IR LED and other components has enough power and does not fluctuate.
Ideally for fixed brightnes LEDs can use a constant current power supply.
For non fixed brightness we use pwm and mosfet circuits to adjust the brightness and timing of IR LEDs.

test code:

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