Erik -
Library for reading temperature from DS1820, DS18B20 and DS1822
Dependents: heatmap BLE_Temperature BLE_Temperature_Exercise F334andDS18B20 ... more
Fork of
DS1820
by 
David Pairman
HelloWorld: http://mbed.org/users/Sissors/code/DS1820_HelloWorld/
Library should currently work on all mbed targets, let me know if there is an issue. First however make sure you have latest version of mbed library and this library.
Revision 10:d297ce9ce422, committed 2015-01-30
- Comitter:
- florian
- Date:
- Fri Jan 30 11:07:10 2015 +0000
- Parent:
- 9:3821ca0b7f14
- Child:
- 11:1a3c3002b50c
- Commit message:
- correction of bugs compared to original library.; _Unitialized variable; _Wrong reading of temperature (when subdegree precision is required)
Changed in this revision
| DS1820.cpp | Show annotated file Show diff for this revision Revisions of this file |
--- a/DS1820.cpp Thu Jan 29 19:27:32 2015 +0000
+++ b/DS1820.cpp Fri Jan 30 11:07:10 2015 +0000
@@ -361,18 +361,16 @@
}
answer = reading +0.0; // convert to floating point
if ((FAMILY_CODE == FAMILY_CODE_DS18B20 ) || (FAMILY_CODE == FAMILY_CODE_DS1822 )) {
- answer = answer / 8.0;
+ answer = answer / 16.0;
}
else {
remaining_count = RAM[6];
count_per_degree = RAM[7];
- answer = answer - 0.25 + (count_per_degree - remaining_count) / count_per_degree;
+ answer = floor(answer/2.0) - 0.25 + (count_per_degree - remaining_count) / count_per_degree;
}
- if (scale=='C' or scale=='c')
- answer = answer / 2.0;
- else
+ if (scale=='F' or scale=='f')
// Convert to deg F
- answer = answer * 9.0 / 10.0 + 32.0;
+ answer = answer * 9.0 / 5.0 + 32.0;
}
return answer;
}
DS1820