Hall effect sensor principles.
													
																	Hall effect sensor circuit diagram. 
									
	
		
	
																	With this circuit we will be able to detect when any mangets in proximity of our circuit. 
																	A sensor can be used to trigger a timer for a specific duty. 
																	A hall effect sensor is used to trigger a timer ic. 
																	When a magnetic source comes in close proximity to the hes it supplies a negative trigger pulse to the timer. 
															
													
									
	
		
	
																	Hall effect sensor ic dn6848 from panasonic is the heart of the circuit. 
																	A hall effect sensor is a sensor which detects magnetic fields. 
																	The hall effect sensor explained above can be quickly configured through a few external parts for converting magnetic field into electrical toggling pulses for controlling a load. 
																	1 kilo ohms resistor use as a current limiter for an led you can lower value if you want an led brighter. 
															
													
									
	
		
	
																	The dn6848 has a built in hall effect sensor schmitt trigger circuit power supply regulator and temperature compensation circuits integrated to a single chip. 
																	Resistor r1 acts as a positive bias for the for the input at pin 2. 
																	Circuit diagram using hall effect sensor. 
																	When the magnetic flux density around the sensor exceeds a certain pre set threshold the sensor detects it and generates an output voltage called the hall voltage v h. 
															
													
									
	
		
	
																	The output signal from a hall effect sensor is the function of magnetic field density around the device. 
																	Consider the diagram below. 
																	The circuit diagram shown here is of a hall effect switch.