Tilt Sensor via Accelerometer Circuit

  
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The schematic for this project is fairly large and you can see the complete schematic below. To explain what is happening here I will split it into two sections which I will call the analog and digital sections. The schemtic below (click to enlarge it) is the analog to digital conversion circuit. It has 12 comparators, 6 for the X axis and 6 for
Tilt Sensor via Accelerometer Circuit - schematic

the Y axis. These comparators will output a logic `1` when in an active state (previously described in the theory section) otherwise they output a logic `0`. This output is then passed onto the digital circuit where it is parsed. The comparator used for this part of the circuit is the tried and true LM339. It has 4 comparators inside of it and runs off of a single power supply. Since we need 12 comparators in total, 3 LM339 IC`s will be used. Two voltage dividers are used. The first voltage divider is made up of two 1k © resistors which divides the intial +5v down and is then fed to the reference resistor voltage divider. The divided input voltage turns out to be +2. 25v and it is also used to power the accelerometer. This part of the design could be simplified but I got a little lazy, sorry!



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