160 lines
5.2 KiB
C++
Executable file
160 lines
5.2 KiB
C++
Executable file
/***************************************************************************
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This is a library for the BME280 humidity, temperature & pressure sensor
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Designed specifically to work with the Adafruit BME280 Breakout
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----> http://www.adafruit.com/products/2650
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These sensors use I2C or SPI to communicate, 2 or 4 pins are required
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to interface. The device's I2C address is either 0x76 or 0x77.
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Adafruit invests time and resources providing this open source code,
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please support Adafruit andopen-source hardware by purchasing products
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from Adafruit!
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Written by Limor Fried & Kevin Townsend for Adafruit Industries.
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BSD license, all text above must be included in any redistribution
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See the LICENSE file for details.
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***************************************************************************/
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#include <Wire.h>
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#include <SPI.h>
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#include <Adafruit_Sensor.h>
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#include <Adafruit_BME280.h>
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#define BME_SCK 13
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#define BME_MISO 12
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#define BME_MOSI 11
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#define BME_CS 10
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#define SEALEVELPRESSURE_HPA (1013.25)
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Adafruit_BME280 bme; // I2C
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//Adafruit_BME280 bme(BME_CS); // hardware SPI
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//Adafruit_BME280 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // software SPI
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unsigned long delayTime;
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void setup() {
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Serial.begin(9600);
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Serial.println(F("BME280 test"));
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if (! bme.begin(&Wire)) {
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Serial.println("Could not find a valid BME280 sensor, check wiring!");
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while (1);
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}
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Serial.println("-- Default Test --");
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Serial.println("normal mode, 16x oversampling for all, filter off,");
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Serial.println("0.5ms standby period");
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delayTime = 5000;
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// For more details on the following scenarious, see chapter
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// 3.5 "Recommended modes of operation" in the datasheet
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/*
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// weather monitoring
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Serial.println("-- Weather Station Scenario --");
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Serial.println("forced mode, 1x temperature / 1x humidity / 1x pressure oversampling,");
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Serial.println("filter off");
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bme.setSampling(Adafruit_BME280::MODE_FORCED,
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Adafruit_BME280::SAMPLING_X1, // temperature
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Adafruit_BME280::SAMPLING_X1, // pressure
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Adafruit_BME280::SAMPLING_X1, // humidity
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Adafruit_BME280::FILTER_OFF );
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// suggested rate is 1/60Hz (1m)
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delayTime = 60000; // in milliseconds
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*/
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/*
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// humidity sensing
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Serial.println("-- Humidity Sensing Scenario --");
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Serial.println("forced mode, 1x temperature / 1x humidity / 0x pressure oversampling");
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Serial.println("= pressure off, filter off");
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bme.setSampling(Adafruit_BME280::MODE_FORCED,
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Adafruit_BME280::SAMPLING_X1, // temperature
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Adafruit_BME280::SAMPLING_NONE, // pressure
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Adafruit_BME280::SAMPLING_X1, // humidity
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Adafruit_BME280::FILTER_OFF );
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// suggested rate is 1Hz (1s)
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delayTime = 1000; // in milliseconds
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*/
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/*
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// indoor navigation
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Serial.println("-- Indoor Navigation Scenario --");
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Serial.println("normal mode, 16x pressure / 2x temperature / 1x humidity oversampling,");
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Serial.println("0.5ms standby period, filter 16x");
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bme.setSampling(Adafruit_BME280::MODE_NORMAL,
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Adafruit_BME280::SAMPLING_X2, // temperature
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Adafruit_BME280::SAMPLING_X16, // pressure
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Adafruit_BME280::SAMPLING_X1, // humidity
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Adafruit_BME280::FILTER_X16,
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Adafruit_BME280::STANDBY_MS_0_5 );
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// suggested rate is 25Hz
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// 1 + (2 * T_ovs) + (2 * P_ovs + 0.5) + (2 * H_ovs + 0.5)
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// T_ovs = 2
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// P_ovs = 16
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// H_ovs = 1
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// = 40ms (25Hz)
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// with standby time that should really be 24.16913... Hz
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delayTime = 41;
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*/
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/*
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// gaming
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Serial.println("-- Gaming Scenario --");
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Serial.println("normal mode, 4x pressure / 1x temperature / 0x humidity oversampling,");
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Serial.println("= humidity off, 0.5ms standby period, filter 16x");
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bme.setSampling(Adafruit_BME280::MODE_NORMAL,
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Adafruit_BME280::SAMPLING_X1, // temperature
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Adafruit_BME280::SAMPLING_X4, // pressure
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Adafruit_BME280::SAMPLING_NONE, // humidity
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Adafruit_BME280::FILTER_X16,
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Adafruit_BME280::STANDBY_MS_0_5 );
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// Suggested rate is 83Hz
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// 1 + (2 * T_ovs) + (2 * P_ovs + 0.5)
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// T_ovs = 1
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// P_ovs = 4
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// = 11.5ms + 0.5ms standby
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delayTime = 12;
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*/
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Serial.println();
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}
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void loop() {
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// Only needed in forced mode! In normal mode, you can remove the next line.
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bme.takeForcedMeasurement(); // has no effect in normal mode
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printValues();
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delay(delayTime);
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}
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void printValues() {
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Serial.print("Temperature = ");
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Serial.print(bme.readTemperature());
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Serial.println(" *C");
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Serial.print("Pressure = ");
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Serial.print(bme.readPressure() / 100.0F);
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Serial.println(" hPa");
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Serial.print("Approx. Altitude = ");
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Serial.print(bme.readAltitude(SEALEVELPRESSURE_HPA));
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Serial.println(" m");
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Serial.print("Humidity = ");
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Serial.print(bme.readHumidity());
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Serial.println(" %");
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Serial.println();
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}
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