Own fork of MbedSmartRestMain
Dependencies: C027_Support C12832 LM75B MMA7660 MbedSmartRest mbed-rtos mbed
Fork of MbedSmartRestMain by
Diff: measurement/Temperature.cpp
- Revision:
- 100:dbcd3bc51758
- Child:
- 117:e831cdb799ab
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/measurement/Temperature.cpp Fri May 08 12:19:57 2015 +0000 @@ -0,0 +1,33 @@ +#include <stdio.h> +#include "Temperature.h" +#include "SmartRestConf.h" +#include "logging.h" + +// Cut-off for avoiding sending similar sensor reading. +#define THRESHOLD_PERCENT_TEMP 0.02 +// Timeout for forcing a sending even if readings are similar [seconds]. +#define TIME_LIMIT_TEMP 900 + +size_t Temperature::read(char *buf, size_t maxLen, char *status, size_t num) +{ + static const char *fmt = "105,%ld,%f\r\n"; + if (!deviceReady) + return 0; + + float data = sensor.temp(); + if (abs(oldValue-data) <= abs(oldValue)*THRESHOLD_PERCENT_TEMP) { + time_t t_interval = time(NULL) - t_start; + if (t_interval < TIME_LIMIT_TEMP) { + return 0; + } else { + aDebug("Temp: Timeout at %d s.\n", t_interval); + } + } + size_t l = snprintf(buf, maxLen, fmt, deviceID, data); + if (status) { + snprintf(status, num, "Send Temp %.2f", data); + } + oldValue = data; + t_start = time(NULL); + return l; +} \ No newline at end of file