Ksenia Kondrashova
HYT humidity & temp sensor polling / showing received data at TFT with capacitive touchscreen
Dependencies: FT800_2 HYT mbed
HYT humidity & temperature sensor: polling and showing data at TFT via graphical controller FT800/FT801.
Hardware
- HYT-271 / HYT-221 / HYT-939 humidity and temperature sensor by IST-AG
- TFT module uxTouch by Riverdi
- Break Out Board 20 by Riverdi
- Any mbed platform with I2C interface, SPI interface and 2 free GPIO for PD and INT signals
For documentation on the FT800 library, please refer to the library pages.
Connection
MCU-board to TFT-module
MCU-board is connected to TFT-module via Break Out Board. You need 6 signals to connect: SCK, MOSI and MISO are connected to a SPI channel, SS is the chip select signal, PD work as powerdown and INT for interrupts from TFT to MCU.
You have to connect VDD to BLVDD at Break Out Board if you use the board:
MCU-board to HYT sensor
MCU-board is connected to sensor via I2C. Remember to use pull-up resisrors there:
Подробнее в статьях Как перестать бояться и полюбить mbed [Часть 1 - 5] на https://habrahabr.ru/users/uuuulala/topics/
Diff: statistics.cpp
- Revision:
- 0:5d3131d1b142
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/statistics.cpp Fri Oct 07 11:08:19 2016 +0000
@@ -0,0 +1,132 @@
+#include "statistics.h"
+
+/**************************************************************************************************************************
+************************** Main function called every second **************************************************************
+**************************************************************************************************************************/
+uint64_t Statistics::UpdateStatistics(float humidity, float temperature, uint64_t seconds, uint64_t changeSecondsOffset)
+{
+ short int secondsIn5min = (seconds % 300); // 0..299
+ if (secondsIn5min == 0) {
+ changeSecondsOffset = Update24hrsData(changeSecondsOffset);
+ }
+ CalculateHumididty(humidity, secondsIn5min);
+ CalculateTemperature(temperature, secondsIn5min);
+
+ // changeSecondsOffset is nessesary for changing time-grid if more then 24 hours left since devise was turned on
+ return changeSecondsOffset;
+}
+
+/**************************************************************************************************************************
+************************** Update average, minimum and maximum humidity in current five-minute interval ****************
+**************************************************************************************************************************/
+void Statistics::CalculateHumididty(float humidity, short int secondsIn5min)
+{
+ humidity5min[secondsIn5min] = humidity;
+ humidity5minSum += humidity5min[secondsIn5min];
+ humidity5minAverage = humidity5minSum / (secondsIn5min + 1);
+
+ if (humidity5min[secondsIn5min] > humidity5minMax || humidity5minMax == INIT_STATISTICS_NUMBER) {
+ humidity5minMax = humidity5min[secondsIn5min];
+ }
+ if (humidity5min[secondsIn5min] < humidity5minMin || humidity5minMin == INIT_STATISTICS_NUMBER) {
+ humidity5minMin = humidity5min[secondsIn5min];
+ }
+}
+
+/**************************************************************************************************************************
+************************** Update average, minimum and maximum temperature in current five-minute interval ****************
+**************************************************************************************************************************/
+void Statistics::CalculateTemperature(float temperature, short int secondsIn5min)
+{
+ // we use TEMPERATURE_MULTIPLIER = 10 for store temperatures tenths in integer values
+ temperature5min[secondsIn5min] = temperature * TEMPERATURE_MULTIPLIER;
+ temperature5minSum += temperature5min[secondsIn5min];
+ temperature5minAverage = temperature5minSum / (secondsIn5min + 1);
+
+ if (temperature5min[secondsIn5min] > temperature5minMax || temperature5minMax == INIT_STATISTICS_NUMBER) {
+ temperature5minMax = temperature5min[secondsIn5min];
+ }
+ if (temperature5min[secondsIn5min] < temperature5minMin || temperature5minMin == INIT_STATISTICS_NUMBER) {
+ temperature5minMin = temperature5min[secondsIn5min];
+ }
+}
+
+/**************************************************************************************************************************
+************************** Update humidity24hrs[][] and temperature24hrs[][] after each five-minute interval **************
+**************************************************************************************************************************/
+uint64_t Statistics::Update24hrsData(uint64_t changeSecondsOffset)
+{
+ // after each five-minute interval we moving to next value if it's availiable
+ // OR shifting the entire array and update just last value if 24 hrs are already gone
+ if (Counter24hrs < 287) {
+ Counter24hrs ++;
+ } else {
+ for (int i = 0; i < 288; i++) {
+ humidity24hrs[0][i] = humidity24hrs[0][i + 1];
+ humidity24hrs[1][i] = humidity24hrs[1][i + 1];
+ humidity24hrs[2][i] = humidity24hrs[2][i + 1];
+ temperature24hrs[0][i] = temperature24hrs[0][i + 1];
+ temperature24hrs[1][i] = temperature24hrs[1][i + 1];
+ temperature24hrs[2][i] = temperature24hrs[2][i + 1];
+ }
+ Counter24hrs = 287;
+ changeSecondsOffset += 300;
+ }
+
+ // update the current value
+ humidity24hrs[0][Counter24hrs] = humidity5minAverage;
+ humidity24hrs[1][Counter24hrs] = humidity5minMin;
+ humidity24hrs[2][Counter24hrs] = humidity5minMax;
+ temperature24hrs[0][Counter24hrs] = temperature5minAverage;
+ temperature24hrs[1][Counter24hrs] = temperature5minMin;
+ temperature24hrs[2][Counter24hrs] = temperature5minMax;
+
+ // initialize all values using for calculations "inside" five-minute interval
+ for (int i = 0; i < 300; i++) {
+ humidity5min[i] = INIT_STATISTICS_NUMBER;
+ temperature5min[i] = INIT_STATISTICS_NUMBER;
+ }
+ humidity5minSum = 0;
+ humidity5minMax = INIT_STATISTICS_NUMBER;
+ humidity5minMin = INIT_STATISTICS_NUMBER;
+ temperature5minSum = 0;
+ temperature5minMax = INIT_STATISTICS_NUMBER;
+ temperature5minMin = INIT_STATISTICS_NUMBER;
+
+ // changeSecondsOffset is nessesary for changing time-grid if more then 24 hours left since devise was turned on
+ return changeSecondsOffset;
+}
+
+/**************************************************************************************************************************
+************************** Initialization for all statistics values and arrays ********************************************
+**************************************************************************************************************************/
+void Statistics::InitValues(float humidity, float temperature)
+{
+ for (int i = 0; i < 300; i++) {
+ humidity5min[i] = INIT_STATISTICS_NUMBER;
+ temperature5min[i] = INIT_STATISTICS_NUMBER;
+ }
+ for (int i = 0; i < 288; i++) {
+ humidity24hrs[0][i] = INIT_STATISTICS_NUMBER;
+ humidity24hrs[1][i] = INIT_STATISTICS_NUMBER;
+ humidity24hrs[2][i] = INIT_STATISTICS_NUMBER;
+ temperature24hrs[0][i] = INIT_STATISTICS_NUMBER;
+ temperature24hrs[1][i] = INIT_STATISTICS_NUMBER;
+ temperature24hrs[2][i] = INIT_STATISTICS_NUMBER;
+ }
+ humidity5min[0] = humidity;
+ humidity5minMin = humidity;
+ humidity5minMax = humidity;
+ humidity24hrs[0][0] = humidity;
+ humidity24hrs[1][0] = humidity;
+ humidity24hrs[2][0] = humidity;
+
+ temperature5min[0] = temperature * TEMPERATURE_MULTIPLIER;
+ temperature5minMin = temperature * TEMPERATURE_MULTIPLIER;
+ temperature5minMax = temperature * TEMPERATURE_MULTIPLIER;
+ temperature24hrs[0][0] = temperature * TEMPERATURE_MULTIPLIER;
+ temperature24hrs[1][0] = temperature * TEMPERATURE_MULTIPLIER;
+ temperature24hrs[2][0] = temperature * TEMPERATURE_MULTIPLIER;
+
+ Counter24hrs = 0;
+}
\ No newline at end of file