Digital compass
Things we need to build a compass
1. ic 7805 used as 5v regulator
2.leds
3.9v battery
4.dinsmore 1490 works on priciple of hall effect it is a sensor
It detects the earth magnetic field using dimnsore 1490 electronic compass.
sensor has 12 pins which are arranged in to four sets of three. pins marked 1 are connected to the positive (+5V). pins marked 2 are tied together and connected to the ground. The pins marked 3 are the output pins. Each output pin is equivalent to the open collected of an NPN transistor and can sink up to 20mA. An LED is connected between the positive (+5V) and each of the output pin. The 1K resistor will limit the LED current to 5mA.The direction can be identified by interpreting the combination of LEDs glowing. A typical 5V regulator using IC 7805 is used to produce 5V DC from the 9V battery for powering the circuit.
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