194 lines
6.9 KiB
C++
194 lines
6.9 KiB
C++
//******************************************************************************************
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// File: PS_AdafruitBME280_TempHumidPress.cpp
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// Authors: Dan G Ogorchock & Daniel J Ogorchock (Father and Son)
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//
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// Summary: PS_AdafruitBME280_TempHumidPress is a class which implements the "Temperature Measurement",
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// "Relative Humidity Measurement", and "PressureMewasurement" device capabilities.
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// It inherits from the st::PollingSensor class. The current version uses I2C to measure the
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// temperature, humidity, and pressure from a BME280 series sensor using the Adafruit_BME280 library.
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//
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// Create an instance of this class in your sketch's global variable section
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// For Example: st::PS_AdafruitBME280_TempHumidPress sensor2(F("bme280_1"), 60, 0, "temperature1", "humidity1", "pressure1", false, 100, 0x77);
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//
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// st::PS_AdafruitBME280_TempHumidPress() constructor requires the following arguments
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// - String &name - REQUIRED - the name of the object - must be unique, but is not used for data transfer for this device
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// - long interval - REQUIRED - the polling interval in seconds
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// - long offset - REQUIRED - the polling interval offset in seconds - used to prevent all polling sensors from executing at the same time
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// - String strTemp - REQUIRED - name of temperature sensor to send to ST Cloud (e.g."temperature1")
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// - String strHumid - REQUIRED - name of humidity sensor to send to ST Cloud (e.g. "humidity1")
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// - String strPressure - REQUIRED - name of pressure sensor to send to ST Cloud (e.g. "pressure1")
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// - bool In_C - OPTIONAL - true = Report Celsius, false = Report Fahrenheit (Fahrenheit is the default)
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// - byte filterConstant - OPTIONAL - Value from 5% to 100% to determine how much filtering/averaging is performed 100 = none (default), 5 = maximum
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// - int address - OPTIONAL - I2C address of the sensor (defaults to 0x77 for the BME280)
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//
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// Filtering/Averaging
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//
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// Filtering the value sent to ST is performed per the following equation
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//
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// filteredValue = (filterConstant/100 * currentValue) + ((1 - filterConstant/100) * filteredValue)
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//
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// This class supports receiving configuration data from the SmartThings cloud via the ST App. A user preference
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// can be configured in your phone's ST App, and then the "Configure" tile will send the data for all sensors to
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// the ST Shield. For PollingSensors, this data is handled in the beSMart() function.
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//
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// TODO: Determine a method to persist the ST Cloud's Polling Interval data
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//
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// Change History:
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//
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// Date Who What
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// ---- --- ----
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// 2018-07-01 Dan & Daniel Original Creation
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//
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//******************************************************************************************
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#include "PS_AdafruitBME280_TempHumidPress.h"
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#include "Constants.h"
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#include "Everything.h"
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namespace st
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{
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//private
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//public
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//constructor - called in your sketch's global variable declaration section
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PS_AdafruitBME280_TempHumidPress::PS_AdafruitBME280_TempHumidPress(const __FlashStringHelper *name, unsigned int interval, int offset, String strTemp, String strHumid, String strPressure, bool In_C, byte filterConstant, int address) :
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PollingSensor(name, interval, offset),
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bme(),
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m_fTemperatureSensorValue(-1.0),
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m_fHumiditySensorValue(-1.0),
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m_fPressureSensorValue(-1.0),
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m_strTemperature(strTemp),
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m_strHumidity(strHumid),
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m_strPressure(strPressure),
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m_In_C(In_C),
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m_nAddress(address)
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{
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//check for upper and lower limit and adjust accordingly
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if ((filterConstant <= 0) || (filterConstant >= 100))
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{
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m_fFilterConstant = 1.0;
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}
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else if (filterConstant <= 5)
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{
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m_fFilterConstant = 0.05;
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}
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else
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{
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m_fFilterConstant = float(filterConstant) / 100;
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}
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}
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//destructor
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PS_AdafruitBME280_TempHumidPress::~PS_AdafruitBME280_TempHumidPress()
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{
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}
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//SmartThings Shield data handler (receives configuration data from ST - polling interval, and adjusts on the fly)
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void PS_AdafruitBME280_TempHumidPress::beSmart(const String &str)
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{
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String s = str.substring(str.indexOf(' ') + 1);
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if (s.toInt() != 0) {
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st::PollingSensor::setInterval(s.toInt() * 1000);
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if (st::PollingSensor::debug) {
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Serial.print(F("PS_AdafruitBME280_TempHumidPress::beSmart set polling interval to "));
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Serial.println(s.toInt());
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}
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}
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else {
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if (st::PollingSensor::debug)
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{
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Serial.print(F("PS_AdafruitBME280_TempHumidPress::beSmart cannot convert "));
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Serial.print(s);
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Serial.println(F(" to an Integer."));
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}
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}
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}
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//initialization routine - get first set of readings and send to ST cloud
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void PS_AdafruitBME280_TempHumidPress::init()
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{
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char buf[5];
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sprintf(buf, "%02X", m_nAddress);
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bool status = bme.begin(m_nAddress);
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if (st::PollingSensor::debug)
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{
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if (!status) {
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Serial.println();
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Serial.print("Error: Could not find a valid BME280 sensor at address 0x");
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Serial.print(buf);
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Serial.println(", check wiring and address setting in sketch!");
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Serial.println();
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delay(3000);
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}
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}
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getData();
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}
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//function to get data from sensor and queue results for transfer to ST Cloud
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void PS_AdafruitBME280_TempHumidPress::getData()
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{
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//Humidity
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if (m_fHumiditySensorValue == -1.0)
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{
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Serial.println("First time through Humidity");
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m_fHumiditySensorValue = bme.readHumidity(); //first time through, no filtering
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}
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else
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{
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m_fHumiditySensorValue = (m_fFilterConstant * bme.readHumidity()) + (1 - m_fFilterConstant) * m_fHumiditySensorValue;
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}
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//Temperature
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if (m_fTemperatureSensorValue == -1.0)
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{
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Serial.println("First time through Temperature");
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//first time through, no filtering
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if (m_In_C == false)
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{
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m_fTemperatureSensorValue = (bme.readTemperature() * 1.8) + 32.0; //Scale from Celsius to Farenheit
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}
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else
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{
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m_fTemperatureSensorValue = bme.readTemperature();
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}
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}
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else
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{
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if (m_In_C == false)
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{
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m_fTemperatureSensorValue = (m_fFilterConstant * ((bme.readTemperature() * 1.8) + 32.0)) + (1 - m_fFilterConstant) * m_fTemperatureSensorValue;
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}
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else
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{
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m_fTemperatureSensorValue = (m_fFilterConstant * bme.readTemperature()) + (1 - m_fFilterConstant) * m_fTemperatureSensorValue;
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}
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}
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//Pressure
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if (m_fPressureSensorValue == -1.0)
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{
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Serial.println("First time through Pressure");
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m_fPressureSensorValue = (bme.readPressure() / 100.0F); //first time through, no filtering
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}
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else
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{
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m_fPressureSensorValue = (m_fFilterConstant * (bme.readPressure() / 100.0F)) + (1 - m_fFilterConstant) * m_fPressureSensorValue;
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}
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Everything::sendSmartString(m_strTemperature + " " + String(m_fTemperatureSensorValue));
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Everything::sendSmartString(m_strHumidity + " " + String(m_fHumiditySensorValue));
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Everything::sendSmartString(m_strPressure + " " + String(m_fPressureSensorValue));
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}
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}
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