thermostat
Dependencies: 4DGL-uLCD-SE PinDetect SDFileSystem mbed
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TMP36.h@2:58d85409f7ff, 2013-01-31 (annotated)
- Committer:
- 4180_1
- Date:
- Thu Jan 31 03:15:20 2013 +0000
- Revision:
- 2:58d85409f7ff
ver 1.0
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
4180_1 | 2:58d85409f7ff | 1 | #include "mbed.h" |
4180_1 | 2:58d85409f7ff | 2 | |
4180_1 | 2:58d85409f7ff | 3 | //Setup a new class for TMP36 sensor |
4180_1 | 2:58d85409f7ff | 4 | class TMP36 |
4180_1 | 2:58d85409f7ff | 5 | { |
4180_1 | 2:58d85409f7ff | 6 | public: |
4180_1 | 2:58d85409f7ff | 7 | TMP36(PinName pin); |
4180_1 | 2:58d85409f7ff | 8 | TMP36(); |
4180_1 | 2:58d85409f7ff | 9 | operator float (); |
4180_1 | 2:58d85409f7ff | 10 | float read(); |
4180_1 | 2:58d85409f7ff | 11 | private: |
4180_1 | 2:58d85409f7ff | 12 | //class sets up the AnalogIn pin |
4180_1 | 2:58d85409f7ff | 13 | AnalogIn _pin; |
4180_1 | 2:58d85409f7ff | 14 | }; |
4180_1 | 2:58d85409f7ff | 15 | |
4180_1 | 2:58d85409f7ff | 16 | TMP36::TMP36(PinName pin) : _pin(pin) |
4180_1 | 2:58d85409f7ff | 17 | { |
4180_1 | 2:58d85409f7ff | 18 | // _pin(pin) means pass pin to the AnalogIn constructor |
4180_1 | 2:58d85409f7ff | 19 | } |
4180_1 | 2:58d85409f7ff | 20 | |
4180_1 | 2:58d85409f7ff | 21 | float TMP36::read() |
4180_1 | 2:58d85409f7ff | 22 | { |
4180_1 | 2:58d85409f7ff | 23 | //convert sensor reading to temperature in degrees C |
4180_1 | 2:58d85409f7ff | 24 | return ((_pin.read()*3.3)-0.500)*100.0; |
4180_1 | 2:58d85409f7ff | 25 | } |
4180_1 | 2:58d85409f7ff | 26 | //overload of float conversion (avoids needing to type .read() in equations) |
4180_1 | 2:58d85409f7ff | 27 | TMP36::operator float () |
4180_1 | 2:58d85409f7ff | 28 | { |
4180_1 | 2:58d85409f7ff | 29 | //convert sensor reading to temperature in degrees C |
4180_1 | 2:58d85409f7ff | 30 | return ((_pin.read()*3.3)-0.500)*100.0; |
4180_1 | 2:58d85409f7ff | 31 | } |