Joseph Ellsworth
Calculate temperature based on resistance from thermistor with lookup chart
thermister_ert-j0eg1.h@5:88bf5a42812e, 2016-03-30 (annotated)
- Committer:
- joeata2wh
- Date:
- Wed Mar 30 13:32:40 2016 +0000
- Revision:
- 5:88bf5a42812e
- Parent:
- 0:39f659087759
- Child:
- 6:3c9cb2bd08c6
Fixed odd bug when readings where for very high resistance. Also renamed some constants to provide less potential for conflict with other modules.
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| joeata2wh | 0:39f659087759 | 1 | #ifndef thermister_ert_j0eg1_h |
| joeata2wh | 0:39f659087759 | 2 | #define thermister_ert_j0eg1_h |
| joeata2wh | 5:88bf5a42812e | 3 | #define ERTThermisterAdcRef 3.30f |
| joeata2wh | 5:88bf5a42812e | 4 | #define ERTThermisterErrorOver 255.0f |
| joeata2wh | 5:88bf5a42812e | 5 | #define ERTThermisterErrorUnder -255.0f |
| joeata2wh | 0:39f659087759 | 6 | |
| joeata2wh | 0:39f659087759 | 7 | float conv_c_to_f(float tempC); |
| joeata2wh | 5:88bf5a42812e | 8 | float conv_f_to_c(float tempF); |
| joeata2wh | 5:88bf5a42812e | 9 | float ERTThermisterReadTemp(AnalogIn adcpin); |
| joeata2wh | 5:88bf5a42812e | 10 | float ERTThermisterAvgReadTemp(AnalogIn adcpin, int numRead); |
| joeata2wh | 5:88bf5a42812e | 11 | |
| joeata2wh | 5:88bf5a42812e | 12 | |
| joeata2wh | 5:88bf5a42812e | 13 | // Read the ERT0xxx thermister and return the temperature |
| joeata2wh | 5:88bf5a42812e | 14 | // in C on the specified pin. |
| joeata2wh | 5:88bf5a42812e | 15 | // TODO: How do we detect and report error of -999; |
| joeata2wh | 5:88bf5a42812e | 16 | |
| joeata2wh | 5:88bf5a42812e | 17 | // Shorthand to read thermister by pinName |
| joeata2wh | 5:88bf5a42812e | 18 | // rather than reading it with pre-allocated |
| joeata2wh | 5:88bf5a42812e | 19 | // AnalogIn. |
| joeata2wh | 5:88bf5a42812e | 20 | float ERTThermisterRead(PinName apin); |
| joeata2wh | 5:88bf5a42812e | 21 | |
| joeata2wh | 5:88bf5a42812e | 22 | // read the temp from thermister and print out |
| joeata2wh | 5:88bf5a42812e | 23 | // both the reading and intermediate values. |
| joeata2wh | 5:88bf5a42812e | 24 | float ERTThermisterReadPrint(Serial log, char *label, PinName apin); |
| joeata2wh | 0:39f659087759 | 25 | |
| joeata2wh | 0:39f659087759 | 26 | #endif |