A sensor can be used to trigger a timer for a specific duty.
Hall effect sensor circuit diagram.
The output signal from a hall effect sensor is the function of magnetic field density around the device.
Hall effect sensor principles.
With this circuit we will be able to detect when any mangets in proximity of our circuit.
Hall effect sensor ic dn6848 from panasonic is the heart of the circuit.
The dn6848 has a built in hall effect sensor schmitt trigger circuit power supply regulator and temperature compensation circuits integrated to a single chip.
A hall effect sensor is used to trigger a timer ic.
Circuit diagram using hall effect sensor.
The hall effect sensor we will use in this circuit is an a1302 hall effect sensor manufactured by allegro.
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.
Consider the diagram below.
If you want to use hall effect sensor with arduino board you must add 10 kilo ohms resistor between a positive electrode and an output of hall effect sensor to make the output from ic high 5 volts.
A hall effect sensor is a sensor which detects magnetic fields.
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.
1 kilo ohms resistor use as a current limiter for an led you can lower value if you want an led brighter.
The simple circuit diagram can be seen below.