Proximity Sensor Interfacing to an Arduino (sinking sensor)

How much voltage comes out of the black wire that seems to be going direct into pin 2?

GREAT video and explanation with Arduino Sketch to top it off.
I'm making Auto-Calibrate for my RostockMax 3D printer.
The sensors just arrived today, so I'll try your sketch.
Thanks again!

Will this inductive proximity sensor work on a soda can? Any idea what the max distance would be?

Check out out the following link to see the safest way to connect an PNP sensor to an Arduino or Pi it basically turns the sensor into an NPN sensor:

Voltage dividers are a bad idea for connecting a PNP sensor. The divider voltage will fluctuate based on the sensor voltage. This connection guarantees the voltage used will be the 5 volts used on your Microcontroller.

https://plus.google.com/u/0/photos/photo/104501828577578493064/6345557141306795602?icm=false&authkey=CNXdgJKLg4nYtQE

Hope this helps.

Dorian

Thank you so much sir!! this really helps me to my thesis 🙂 i almost lost hope 🙁 but thank you so much to your video sir 🙂

Were u using a library ?

Thanks! I read the Arduino digital pin description and it makes sense now. Up and running.

Can i Use this LJC18A3-B-Z/BX Capacitive proximity Sensor to detect plastic only?

Hi, thank you for this good video!!!
I have a Mega 2560.
Does every digital and analog pin has a "INPUT_PULLUP" Resistor?
So I can use more sensors?

This is a great video! I have a similar setup, minus the speaker & everything on the breadboard. It's just a battery, PLC, and (3) NPN sensors.

My question is: how would you hook this up?

Would you use 3 batteries (1 for each sensor)? Or would you use just 1 battery for all sensors? I'd prefer 1 battery, but I'm wondering how…

Hey man, haven't tested this yet but do you know what's the range on when it detects a metal? does it also trigger using human skin? (acting as a touch sensor)

Thanks for the video! I used your set up and code with one light and without the buzzer, but wanted to make it so that when the sensor is touched that the light will turn on then stay on. Then when the sensor is touched again the light will turn off and stay off.

I modified the code slightly using a light function. The set up works just not very well and often inconsistent. For example, i'll touch the sensor and the light will turn on and stay on, but then i'll touch it again and the light will dim a bit and some times turn off and sometimes stay on. Any idea why this may happen? I'm pretty sure the sensor is fine since it worked with your set up and code plus there's a light on the sensor that reacts accurately.

here's the code. Thanks!

int sensorVal;

#define bulb 12

void setup(){
//configure pin2 as an input and enable the internal pull-up resistor

Serial.begin (9600); //Start the serial monitor

pinMode(2, INPUT_PULLUP);

pinMode(12, OUTPUT);

}

void loop(){

sensorVal = digitalRead(2);
// The Logic is inverted a low on pin 2 means a sinking switch is activated
// and a high on pin 2 means the switch is unactivated and pulled up by the internal resistor
// this is not a problem since the controller can interpret the data any way we tell it to

if (sensorVal == LOW){

Light(); //execute the Light subroutine below

}
}
void Light() //Start the Light subroutine

{ int reading; //turn on the light

reading = digitalRead(12);
if (reading == HIGH){digitalWrite (12,LOW);}
else{digitalWrite (12, HIGH);}
}

I tried the same setup, but issue i am facing is whatever coming in contact it gets low and gives me output. it works for my hand , plastic everything. please help how would i differentiate metal using the same…

I don’t get the code please explain

Check the following link for a schematic: https://www.circuitlab.com/circuit/ucbh682s72rr/screenshot/1024×768/

I love the video and I want to modify it just a little, but I am not sure how to. When the sensor is activated I want my prototype to shut down. How would I put that in the code? One other thing. Where did you get the speaker? Also where do you clip on the alligator clips onto the speaker. I would really appreciate your help. Thanks!

Thanks for this, I got it to work with a relay attatched! But now I'm trying to add a second sensor (and more later) but it's not working. How do I do that? I want every sensor to be triggered before the relay switches

aWESOME WORK… VERY INFORMATIVE. <3

May i know what value of resistors did you use?

Hey, thank you so much for the video. Could you please let me know which sensor you are using and the range of this particular sensor. Also if you could help me out with the switching frequency of this sensor, I guess that would determine how fast it would be able to detect the objects.

Thank you! Thank you! Thank you! I was trying to hook up an NPN NO 3-36V proximity sensor for bed leveling a kit 3D printer running off an Arduino Mega board.

I have been reading and watching a lot of "how to" videos, But many in the 3D printing community – like me – have a poor understanding of electronics and have been using a voltage divider to condition the signal "coming out" of the black wire in their proximity switch, and they try to do that without regard to whether they are using an NPN or a PNP sensor.

Dorian's video makes it clear why that's not necessary with an NPN sensor because all that this type of sensor is doing is switching the internal Arduino 5V to ground depending on the sensor state. If only I had watched this video two weeks ago!

A separate video recommended putting a diode on the signal (black) wire with the cathode towards the sensor. I did that with my final setup because I had already soldered one to the signal wire. It works… but it's not strictly necessary.

Thank you again Dorian, you put an end to several days of frustration, and with your clear explanation made it clear for me how these switches actually work.

SIR good morning from the Philippines, my classmates and I are making a project study about automatic plastic bottle shredder, and we will use a inductive sensor for sensing metals to open the circuit when someone will throw a metal on our shredder, photoelectric sensor to automatically shred if the storage is full, and a weight sensor to automatically shred if it will get to its desired weight. . . . . can we use this three sensors on a one arduino (uno). . . . and can you make a diagram to be our basis. .. this will be a great help. We are hoping for your reply sir.

Very helpful. Thanks for the tutorial.

Sir, can I know this sensor can produce analog input ?