Switch on and off a photoelectric sensor?

[Jimmylee]

Good day, all
Recently, I am doing a project that use arduino uno to switch on and off a photoelectric sensor (according to Infrared Photoelectric Switch). How do i test the current of the output signal black wire as i worry that the arduino can only take in 5V and 40mA. I have connected the brown to 18V power supply, blue to collector of transistor and 5V supply to the base transistor.

Parts Used:
NPN photoelectric sensor
supply voltage 10-30V
output current <100mA
power consumption <20mA
NPN Transistor 2n3904

 

[FvM]

What does it mean "use arduino uno to switch on and off a photoelectric sensor"? I can only imagine using Arduino to process the sensor output signal.

 

[KlausST]

Hi,

As so often: a hand drawn sketch could be helpful.

Klaus

 

[Jimmylee]

Photoelecric sensors are switched by light. If the sensor output is "NPN open collector", can I use INPUT_PULLUP on the Arduino input pin?

 

[FvM]

Yes, should work.