Comments on: Arduino Temperature Display

By: Robert

Robert — Fri, 07 Nov 2008 23:02:15 +0000

Thanks for your help… I finished my project and wrote up a quick instructable about it…
Had some outside help re-writing the code to use millis() instead of Delays…. check it out!

http://www.instructables.com/id/Digital_Thermostatic_Beer_Refreshment_Regulator/

By: BRuTuS

BRuTuS — Thu, 30 Oct 2008 19:21:27 +0000

Could not find a rounding function in the Arduino software so I made my own

By: Robert

Robert — Thu, 30 Oct 2008 18:34:57 +0000

I found your sketch and have been hacking it up to fit my purpose… it’s getting nice and messy now… hehe.. I’m a hardware guy so software is a different world to me….

Have a question about the conversion part… what does the “if” statement do?

temp = lm35_val; //gets mV reading from LM35 center leg…
temp1=temp/10; // divide by 10 to get “true” Celsius reading
temp2=temp%10; //modulo operation for extra variable of accuracy

if (temp2 >= 5) //not sure what this part does…….????
{
temp_x++;
}

By: BRuTuS

BRuTuS — Wed, 29 Oct 2008 23:46:22 +0000

Yes Sir – Hex to Decimal is how I did it in my program.

the SendLCD command really was just for a tiny bit less typing on my part What I perhaps should have done was modify that function to accept a hex value and convert/send it in decimal.. would have saved me some of the lookup conversions I did by hand.

By: Robert

Robert — Wed, 29 Oct 2008 17:35:18 +0000

Think I might have answered my own question… you have to convert the hex command to regular decimal…. hex value “fe” is decimal “254″ … so sendLcd(254); sendLcd(1) is just the decimal for the hex val to clear the LCD…