• SS49E Datasheet

// -------------------------------------
// 49E Hall Effect Sensor - Code Example
// -------------------------------------
 
const int pinHall = A0; 
void setup() {
  pinMode(pinHall, INPUT);
  Serial.begin(9600);
} 
void loop() {
 
  //we measure 10 times adn make the mean
  long measure = 0;
  for(int i = 0; i < 10; i++){
      int value = 
      measure += analogRead(pinHall);
  }
  measure /= 10;  
  //voltage in mV
  float outputV = measure * 5000.0 / 1023;
  Serial.print("Output Voltaje = ");
  Serial.print(outputV);
  Serial.print(" mV   ");
 
  //flux density
  float magneticFlux =  outputV * 53.33 - 133.3;
  Serial.print("Magnetic Flux Density = ");
  Serial.print(magneticFlux);
  Serial.print(" mT");  
  delay(2000);
}

/*
Analog 49E Hall Effect sensor test
 
Basic code for reading the analog output of the 49E hall effect sensor. 
Sensor is connected to A0, but can be any analog input pin.
*/
const int AnalogPin = A0;
const float GAUSS_PER_STEP = 2.57;  // Sensor outputs approx 1.9mV / Gauss.  
                                    // ADC step is about 4.89mV / Step for 5V operation. 
float rawValue = 0.0;               // Raw ADC Reading
float gaussValue = 0.0;
float zeroLevel = 518.0;  // Adjust value as needed to get zero rawValue output with no magnetic field.
 
//===============================================================================
//  Initialization
//===============================================================================
void setup() 
{ 
  pinMode (AnalogPin, INPUT);
  Serial.begin(9600);         // Set comm speed for debug window messages
}
 
//===============================================================================
//  Main
//===============================================================================
void loop() 
{
  rawValue = analogRead (AnalogPin) - zeroLevel;  // Output normalized to '0' with no field present
  Serial.print ("Reading Raw: ");
  Serial.println (rawValue);
  // Reading positive relative to the South Pole, the North Pole negative
  gaussValue = rawValue * GAUSS_PER_STEP;
  Serial.print ("Reading in Gauss: ");
  Serial.println (gaussValue);
  delay (3000);
}

• Model : KY-003
• Operating Voltage : 5 VDC
• Supply Voltage, VCC : 28 V
• Reverse Battery Voltage, VRCC : -35 V
• Magnetic Flux Density, B : Unlimited
• Output OFF Voltage, VOUT : 28 V
• Reverse Output Voltage, VOUT : -0.5 V
• Continuous Output Current, IOUT : 25 mA
• Operating Temperature Range : -40°C to 85°C
• Storage Tempereture Range : -65°C to 170°C
• Length : 19mm
• Width : 15mm

• 4.5 V to 24 V Operation … Needs Only An Unregulated Supply
• Open-Collector 25 mA Output … Compatible with Digital Logic
• Reverse Battery Protection
• Activate with Small, Commercially Available Permanent Magnets
• Solid-State Reliability
• Small Size
• Resistant to Physical Stress

• 3144_hall_datasheet.pdf
• oh44e-e_sensore-hall.pdf
• https://github.com/R2D2-2017/R2D2-2017/wiki/Keyes-44E402-Magnetic-Hall-Switch-Sensor