-/* SFE_BMP180 library example sketch
-
-This sketch shows how to use the SFE_BMP180 library to read the
-Bosch BMP180 barometric pressure sensor.
-https://www.sparkfun.com/products/11824
-
-Like most pressure sensors, the BMP180 measures absolute pressure.
-This is the actual ambient pressure seen by the device, which will
-vary with both altitude and weather.
-
-Before taking a pressure reading you must take a temparture reading.
-This is done with startTemperature() and getTemperature().
-The result is in degrees C.
-
-Once you have a temperature reading, you can take a pressure reading.
-This is done with startPressure() and getPressure().
-The result is in millibar (mb) aka hectopascals (hPa).
-
-If you'll be monitoring weather patterns, you will probably want to
-remove the effects of altitude. This will produce readings that can
-be compared to the published pressure readings from other locations.
-To do this, use the sealevel() function. You will need to provide
-the known altitude at which the pressure was measured.
-
-If you want to measure altitude, you will need to know the pressure
-at a baseline altitude. This can be average sealevel pressure, or
-a previous pressure reading at your altitude, in which case
-subsequent altitude readings will be + or - the initial baseline.
-This is done with the altitude() function.
-
-Hardware connections:
-
-- (GND) to GND
-+ (VDD) to 3.3V
-
-(WARNING: do not connect + to 5V or the sensor will be damaged!)
-
-You will also need to connect the I2C pins (SCL and SDA) to your
-Arduino. The pins are different on different Arduinos:
-
-Any Arduino pins labeled: SDA SCL
-Uno, Redboard, Pro: A4 A5
-Mega2560, Due: 20 21
-Leonardo: 2 3
-
-Leave the IO (VDDIO) pin unconnected. This pin is for connecting
-the BMP180 to systems with lower logic levels such as 1.8V
-
-Have fun! -Your friends at SparkFun.
-
-The SFE_BMP180 library uses floating-point equations developed by the
-Weather Station Data Logger project: http://wmrx00.sourceforge.net/
-
-Our example code uses the "beerware" license. You can do anything
-you like with this code. No really, anything. If you find it useful,
-buy me a beer someday.
-
-V10 Mike Grusin, SparkFun Electronics 10/24/2013
-*/
-
-// Your sketch must #include this library, and the Wire library.
-// (Wire is a standard library included with Arduino.):
-
-#include <SFE_BMP180.h>
-#include <Wire.h>
-#include "DHT.h"
-
-// You will need to create an SFE_BMP180 object, here called "pressure":
-
-SFE_BMP180 pressure;
-
-// DHT object for humidity sensor
-DHT dht;
-
-#define CO2_PIN A1
-#define DHT_PIN 4
-#define GAS_PIN A0
-#define START_DELAY 20000
-#define DELAY 50000
-
-byte HasBaro;
-
-#define READ_SAMPLE_INTERVAL 50
-#define READ_SAMPLE_TIMES 5
-
-#define MQ135_RES 1000
-
-float MQRead(int mq_pin)
-{
-
- int i;
- float rs=0;
- float rr;
-
- for (i=0;i<READ_SAMPLE_TIMES;i++) {
- rr = analogRead(mq_pin);
- rs += rr;
- delay(READ_SAMPLE_INTERVAL);
- }
-
- rs = rs/READ_SAMPLE_TIMES;
- return rs;
-
-}
-
-/// Parameters to model temperature and humidity dependence
-
-#define CORA 0.00035
-#define CORB 0.02718
-#define CORC 1.39538
-#define CORD 0.0018
-
-float getMQ135CorrectionFactor(float t, float h) {
- return CORA * t * t - CORB * t + CORC - (h-33.)*CORD;
-}
-
-#define RZERO 25300
-#define PARA 116.6020682
-#define PARB 2.769034857
-
-float getMQ135ppm(float Resistance) {
- return PARA * pow((Resistance/RZERO), -PARB);
-}
-
-void setup()
-{
- delay(START_DELAY);
-
- Serial1.begin(57600);
- Serial1.println("START");
-
- // Initialize the sensor (it is important to get calibration values stored on the device).
-
- if (pressure.begin()) {
- Serial1.println("BMP180 init success");
- HasBaro = 1;
- } else {
- Serial1.println("BMP180 init fail\n\n");
- HasBaro = 0;
- }
-
- dht.setup(DHT_PIN);
-
- pinMode(GAS_PIN,INPUT);
- pinMode(CO2_PIN,INPUT);
-
- digitalWrite(GAS_PIN, LOW);
- digitalWrite(CO2_PIN, LOW);
-}
-
-void loop()
-{
- char status;
- double T,P;
- double DHT_T,DHT_H;
- int DHTStatus;
- int Gas;
-
- double LastTemp;
- byte GotTemperature,GotPressure;
-
- // Loop here getting pressure readings every 60 seconds.
-
- GotTemperature = 0;
- GotPressure = 0;
-
- if (HasBaro) {
-
- status = pressure.startTemperature();
- if (status != 0) {
- // Wait for the measurement to complete:
- delay(status);
-
- // Retrieve the completed temperature measurement:
- // Note that the measurement is stored in the variable T.
- // Function returns 1 if successful, 0 if failure.
-
- status = pressure.getTemperature(T);
- if (status = !0) {
- LastTemp=T;
- GotTemperature=1;
- } else {
- Serial1.println("ERROR:TYPE=BMP180,MESSAGE=FAILED MEASURE TEMPERATURE\n");
- }
- } else {
- Serial1.println("ERROR:TYPE=BMP180,MESSAGE=FAILED START TEMPERATURE MEASUREMENT\n");
- }
-
- // Start a pressure measurement:
- // The parameter is the oversampling setting, from 0 to 3 (highest res, longest wait).
- // If request is successful, the number of ms to wait is returned.
- // If request is unsuccessful, 0 is returned.
-
- status = pressure.startPressure(3);
- if (status != 0) {
- // Wait for the measurement to complete:
- delay(status);
-
- // Retrieve the completed pressure measurement:
- // Note that the measurement is stored in the variable P.
- // Note also that the function requires the previous temperature measurement (T).
- // (If temperature is stable, you can do one temperature measurement for a number of pressure measurements.)
- // Function returns 1 if successful, 0 if failure.
-
- status = pressure.getPressure(P,LastTemp);
- if (status != 0) {
- // Print out the measurement:
- GotPressure=1;
-
- } else {
- Serial1.println("ERROR:TYPE=BMP180,MESSAGE=FAILED MEASURE PRESSURE\n");
- }
- } else {
- Serial1.println("ERROR:TYPE=BMP180,MESSAGE=FAILED START PRESSURE MEASUREMENT\n");
- }
- if (GotPressure || GotTemperature) {
- Serial1.print("SENSOR:TYPE=BMP180");
- if (GotPressure) { Serial1.print(",PRESSURE="); Serial1.print(P); }
- if (GotTemperature) { Serial1.print(",TEMPERATURE="); Serial1.print(T); }
- Serial1.println();
- }
- }
-
- delay(dht.getMinimumSamplingPeriod());
-
- DHT_H = dht.getHumidity();
- DHT_T = dht.getTemperature();
-
- DHTStatus=dht.getStatus();
-
- if (DHTStatus == 0) {
- Serial1.print("SENSOR:TYPE=DHT22,TEMPERATURE=");
- Serial1.print(DHT_T);
- Serial1.print(",HUMIDITY=");
- Serial1.println(DHT_H);
- } else {
- Serial1.print("ERROR:TYPE=DHT22,MESSAGE=");
- Serial1.println(dht.getStatusString());
- }
-
- Gas = MQRead(GAS_PIN);
-
- Serial1.print("SENSOR:TYPE=MQ4,VALUE=");
- Serial1.println(Gas);
-
- float MQ135_Resistance;
- float CO2_raw;
- float CO2_ppm;
-
- float CO2_resistance;
-
- CO2_raw = MQRead(CO2_PIN);
- Serial1.print("DEBUG:RAW=");
- Serial1.println(CO2_raw);
-
- MQ135_Resistance=MQ135_RES*(1023./CO2_raw-1);
-
- Serial1.print("DEBUG:RESISTANCE=");
- Serial1.println(MQ135_Resistance);
-
- MQ135_Resistance=MQ135_Resistance/getMQ135CorrectionFactor(DHT_T,DHT_H);
- Serial1.print("DEBUG:CORR_RESISTANCE=");
- Serial1.println(MQ135_Resistance);
-
- CO2_ppm = getMQ135ppm(MQ135_Resistance);
-
- Serial1.print("SENSOR:TYPE=MQ135,VALUE=");
- Serial1.println(CO2_ppm);
-
- delay(DELAY); // Pause for 50 seconds.
-}
-
projects / weathermon.git / blobdiff