Hi All,
I am currently using Arduino Uno ATMega328 and am looking to use the Natural Log function.
Online I read I need to use Arduino ATMega168, though that seems likea downgrade. How can I start using the Natural Log function on my Aruino, such as in this equation
y = -0.317ln(x) + 1.3286
Does the Arduino Micro ATmega32u4 allow me to use Natural Log?
Thanks a ton,
Andrew
Ardiuno includes the AVR libc library. Math functions are here:
http://www.nongnu.org/avr-libc/user-manual/group__avr__math.html
I think, you misunderstood function usage - C basics:
double log(double x)
means that the function requires parameter type double and returns value type double.
I should be just:
y = log(2);
but y should be defined as double and also consider that you are using constant as parameter in loop function and the result will be always the same.
int y;
y = log (2);
Serial.print(y);
aka
Serial.print (0);
Thanks Everyone,
Still having some trouble and been working for hours.
how is natural log of 2, y = log (2); equal to serial.Print (0). I have natural log 2 = .69 on my calculatot?
I would like to add many more decimal places to my y = log (2). Can someone post code that can let me do this?
It's been hard to filter through what I am reading online with float.
Thank you,
Andrew
- how is natural log of 2, y = log (2); equal to serial.Print (0).
It is if you mistakenly assign the natural log of 2 to an integer variable.
To print more decimal places, use a command (function call) like this:
Serial.print(log(2), 4); //prints to 4 decimal places
// 'log' is defined as returning a double precision floating point value as in ...
// double log(double x);
// ... on most Arduinos 'double' is in fact a 'float'
double y = log(2);
Serial.print(y);