Official reference client implementation for Cumulocity SmartREST on u-blox C027.
Dependencies: C027_Support C12832 LM75B MMA7660 MbedSmartRest mbed-rtos mbed
Fork of MbedSmartRestMain by
measurement/Potentiometer.cpp
- Committer:
- xinlei
- Date:
- 2015-05-15
- Revision:
- 114:80610be056e2
- Parent:
- 113:3872569be2af
- Child:
- 115:c54e9731b9de
File content as of revision 114:80610be056e2:
#include <stdio.h> #include "rtos.h" #include "Potentiometer.h" #include "SmartRestConf.h" #include "logging.h" // Cutoff for avoiding sending similar sensor data. #define THRESHOLD_PERCENT_ANA 0.02 // Timeout for forcing a sending even if readings are similar [seconds] #define TIME_LIMIT_ANA 900 AnalogIn analog1(A0); AnalogIn analog2(A1); size_t Potentiometer::read(char *buf, size_t maxLen, char *status, size_t num) { static const char *fmt = "107,%ld,%f,%f\r\n"; const unsigned short N = 10; float data[2] = {0, 0}; float min[2] = {100, 100}; float max[2] = {0, 0}; // multiple sampling for data smoothing for (unsigned short i = 0; i < N; ++i) { float d0 = (float)analog1*100; float d1 = (float)analog2*100; data[0] += d0; data[1] += d1; min[0] = min[0] <= d0 ? min[0] : d0; min[1] = min[1] <= d1 ? min[1] : d1; max[0] = max[0] >= d0 ? max[0] : d0; max[1] = max[1] >= d1 ? max[1] : d1; Thread::wait(5); } data[0] = (data[0]-min[0]-max[0]) / (N-2); data[1] = (data[1]-min[1]-max[1]) / (N-2); if (abs(oldValues[0]-data[0]) <= abs(oldValues[0])*THRESHOLD_PERCENT_ANA && abs(oldValues[1]-data[1]) <= abs(oldValues[1])*THRESHOLD_PERCENT_ANA) { time_t t_interval = time(NULL) - t_start; if (t_interval < TIME_LIMIT_ANA) { return 0; } else { aDebug("Poti: Timeout at %d s.\n", t_interval); } } size_t l = snprintf(buf, maxLen, fmt, deviceID, data[0], data[1]); if (status) { snprintf(status, num, "Send Poti %.1f,%.1f", data[0], data[1]); } oldValues[0] = data[0]; oldValues[1] = data[1]; t_start = time(NULL); return l; }