Decimal to Degrees mathematics help

[Acetronics2]

At 0 degree, record ADC value. Say it shows 150 (this would be your base value).

At 360 degree, record ADC value. Say it shows 900.

Then each degree would become as;
(900-150) / 360 = 2.

That means, when your ADC reading is 152, you will know that you are at 1st degree, 154 is 2nd, 156 is 3rd. etc...

With an additional math, which I am sure you can figure out, you can get the exact degree.


Was this what you needed, or I am in a different page?



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Hi, Sayzer

... life is easy with you !!!

RF:

at first, be sure to use the posssible max of the ADC range for your measure ...

As said by sayzer, read the min ( 0°) and Max ( 359.9 °)

then you get a result between 0 and 1023 ... no use to look at a better than .1% precision ( humour )

But, to keep decimals, just multiply the result by ... 64 , to use the max counting possibilities of the Pic.

so, let's make it clear:

Scale = MaxValue - MinValue

dummy = ( AdcResult - MinValue ) x 64

' disable interrupts ... if necessary

dummy = dummy x 360

Result_64 = DIV32 Scale

' re enable

Now, dividing Result_64 by ... 64 ( 6 right shifts ...) give the INT part.

... and , if needed, the 6 right digits will give 64 x the decimal part.... a little bits shifting ( or multiplying i.e. by 100 )and you can show it !!!


life is sooooooooo simple ....

Alain