Madeline Kistler
/
sci_sensor
Important changes to repositories hosted on mbed.com
Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.
To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.
It is also possible to export all your personal repositories from the account settings page.
sci_sensor.cpp@1:ad071d4ef366, 2020-11-09 (annotated)
- Committer:
- mkistler
- Date:
- Mon Nov 09 17:32:44 2020 +0000
- Revision:
- 1:ad071d4ef366
- Child:
- 2:2a3d5370d769
Working library.;
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| mkistler | 1:ad071d4ef366 | 1 | #include "sci_sensor.h" |
| mkistler | 1:ad071d4ef366 | 2 | |
| mkistler | 1:ad071d4ef366 | 3 | sci_sensor::sci_sensor(PinName in1, PinName in2): _in1(in1), _in2(in2) |
| mkistler | 1:ad071d4ef366 | 4 | { |
| mkistler | 1:ad071d4ef366 | 5 | c1 = -1481.96; |
| mkistler | 1:ad071d4ef366 | 6 | c2 = 2196200; |
| mkistler | 1:ad071d4ef366 | 7 | c3 = 1.8636; |
| mkistler | 1:ad071d4ef366 | 8 | c4 = 0.00000388; |
| mkistler | 1:ad071d4ef366 | 9 | |
| mkistler | 1:ad071d4ef366 | 10 | la = -2; |
| mkistler | 1:ad071d4ef366 | 11 | lb = 3.8062; |
| mkistler | 1:ad071d4ef366 | 12 | } |
| mkistler | 1:ad071d4ef366 | 13 | |
| mkistler | 1:ad071d4ef366 | 14 | //sci_sensor::LM20(PinName in2): _in2(in2) |
| mkistler | 1:ad071d4ef366 | 15 | //{ |
| mkistler | 1:ad071d4ef366 | 16 | |
| mkistler | 1:ad071d4ef366 | 17 | //} |
| mkistler | 1:ad071d4ef366 | 18 | |
| mkistler | 1:ad071d4ef366 | 19 | float sci_sensor::temp() |
| mkistler | 1:ad071d4ef366 | 20 | { |
| mkistler | 1:ad071d4ef366 | 21 | float volt = _in1.read()*3.3; |
| mkistler | 1:ad071d4ef366 | 22 | float T = c1+sqrt(c2 + (c3-volt)/c4); |
| mkistler | 1:ad071d4ef366 | 23 | return T; |
| mkistler | 1:ad071d4ef366 | 24 | |
| mkistler | 1:ad071d4ef366 | 25 | } |
| mkistler | 1:ad071d4ef366 | 26 | |
| mkistler | 1:ad071d4ef366 | 27 | float sci_sensor::phc() |
| mkistler | 1:ad071d4ef366 | 28 | { |
| mkistler | 1:ad071d4ef366 | 29 | float volt = _in2.read()*3.3; |
| mkistler | 1:ad071d4ef366 | 30 | float res = (3.3*3300/volt - 3300)/1000.00; // 3300 is the resistance of my resistor |
| mkistler | 1:ad071d4ef366 | 31 | float lux = pow(10, la*log10(res)+lb); // A and B values were found using the graph for lux vs. resistance |
| mkistler | 1:ad071d4ef366 | 32 | return lux; |
| mkistler | 1:ad071d4ef366 | 33 | } |