Hello !
I'm using inductive proximity sensor( NPN 6 to 36VDC 300mA 4mm) to detect metals. I connect an arduino uno (powered by my pc) with the sensor(power with 9v). I write a code that show me if metal is detected or not. Unfortunately it seems that even if nothing is detected the code is still running, even if I take off the sensor. Is it a connection problem? Must I use other component like resistors, ect ? Or just the code? Can I get help please?
The code :
int sensor = 10;
void setup() {
Serial.begin(9600);
pinMode(sensor, INPUT);
}
void loop() {
int state = digitalRead(sensor);
if (state == HIGH) {
Serial.println("Metal is detected");
delay(2000);
}
else {
Serial.println("No metal");
delay(2000);
}
}
Try putting a 10K resistor between the output of the sensor and GND.
Can I have a schematic please?
the PiR has same terminals that inductive sensor
I'm working with inductive proximity sensor( NPN 6 to 36VDC 300mA 4mm). I just use the PIR to build a schematic because PIR has the same terminals than my sensor
Well, what is the exact model of the inductive proximity sensor?
Inductive Proximity Sensors NPN
The sensor outputs a LOW signal when it detects metal, and 6v isn't compatible with arduino without a resistor or logic converter.
As a newbie 
, I only understand the suggestions. what do I have to do?
Good schematic, but there is NO connection of PIR ground to the Arduino ground.
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Provide a lot more specific information, that we may help.
Hello !
I'm trying to connect 4 inductives proximity sensors NPN with my arduino uno.
I already make connect with 1 sensor according to this schematic
How can I complete the assembly ? May I use a other components like resistors, etc?
Your schematic shows a PIR (passive infrared detector) - that's not "inductive".
Oh sorry, I didn't find the proximity sensor for the schematic. Fortunately it has the same terminals than the PIR. It's the fact that I decide to use it.
Try to imagine that not everyone has a TinkerCAD account.
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