ARDUINO EMF DETECTOR GOES MAD !

Using Arduino Sensors
#1

i made an arduino emf detector , simple circuit ,
connected 1 Mohms Resistor from ground , to A0, then took a wire as probe from A0 ,out ..
when i bring magnet near it , it works properly ,but after a bit of caliberation , i found out it went on ,itself ..
help me plz:'

const int led=13;
void setup() {
  Serial.begin(9600);
  pinMode(led,OUTPUT);
}


void loop() {

  int sensorValue = analogRead(A0);
 
  if(sensorValue>=18){// 28 for no probe ,40 for wire probe ,68 for coilgun coil type 1, 84 for metal //detector
  Serial.print("EMF Reading :");
  Serial.println(sensorValue);
  digitalWrite(led,HIGH);
  delay(1);
  }
  else{digitalWrite(led,LOW);}
  delay(1);       
}
#2

If the pin is floating then attaching a wire to it will make it act like a aerial that picks up ALL EMF like radio, TV, microwave, static, PC & your body.

#3

The magnet will have no effect. It is your hand moving near the aerial that is effecting the reading.

Weedpharma

#4

weedpharma is correct. That is an electric field probe, not an EM probe.

#5

harslu8:
i made an arduino emf detector , simple circuit ,
connected 1 Mohms Resistor from ground , to A0, then took a wire as probe from A0 ,out …
when i bring magnet near it , it works properly ,but after a bit of caliberation , i found out it went on ,itself …
help me plz:’

const int led=13;

void setup() {
  Serial.begin(9600);
  pinMode(led,OUTPUT);
}

void loop() {

int sensorValue = analogRead(A0);

if(sensorValue>=18){// 28 for no probe ,40 for wire probe ,68 for coilgun coil type 1, 84 for metal //detector
  Serial.print(“EMF Reading :”);
  Serial.println(sensorValue);
  digitalWrite(led,HIGH);
  delay(1);
  }
  else{digitalWrite(led,LOW);}
  delay(1);     
}

where did you find the code, can you put a link?

#6