95 lines
2.6 KiB
C++
95 lines
2.6 KiB
C++
// BMx280_I2C.ino
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//
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// shows how to use the BMP280 / BMx280 library with the sensor connected using I2C.
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//
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// Copyright (c) 2018 Gregor Christandl
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//
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// connect the AS3935 to the Arduino like this:
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//
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// Arduino - BMP280 / BME280
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// 3.3V ---- VCC
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// GND ----- GND
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// SDA ----- SDA
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// SCL ----- SCL
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// some BMP280/BME280 modules break out the CSB and SDO pins as well:
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// 5V ------ CSB (enables the I2C interface)
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// GND ----- SDO (I2C Address 0x76)
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// 5V ------ SDO (I2C Address 0x77)
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// other pins can be left unconnected.
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#include <Arduino.h>
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#include <Wire.h>
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#include <BMx280TwoWire.h>
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#define I2C_ADDRESS 0x76
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//create a BMx280I2C object using the I2C interface with I2C Address 0x76
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BMx280TwoWire bmx280(&Wire, I2C_ADDRESS);
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void setup() {
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// put your setup code here, to run once:
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Serial.begin(9600);
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//wait for serial connection to open (only necessary on some boards)
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while (!Serial);
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Wire.begin();
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//begin() checks the Interface, reads the sensor ID (to differentiate between BMP280 and BME280)
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//and reads compensation parameters.
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if (!bmx280.begin())
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{
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Serial.println("begin() failed. check your BMx280 Interface and I2C Address.");
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while (1);
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}
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if (bmx280.isBME280())
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Serial.println("sensor is a BME280");
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else
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Serial.println("sensor is a BMP280");
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//reset sensor to default parameters.
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bmx280.resetToDefaults();
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//by default sensing is disabled and must be enabled by setting a non-zero
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//oversampling setting.
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//set an oversampling setting for pressure and temperature measurements.
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bmx280.writeOversamplingPressure(BMx280MI::OSRS_P_x16);
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bmx280.writeOversamplingTemperature(BMx280MI::OSRS_T_x16);
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//if sensor is a BME280, set an oversampling setting for humidity measurements.
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if (bmx280.isBME280())
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bmx280.writeOversamplingHumidity(BMx280MI::OSRS_H_x16);
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}
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void loop() {
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// put your main code here, to run repeatedly:
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delay(1000);
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//start a measurement
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if (!bmx280.measure())
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{
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Serial.println("could not start measurement, is a measurement already running?");
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return;
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}
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//wait for the measurement to finish.
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do
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{
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delay(100);
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} while (!bmx280.hasValue());
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//important: measurement data is read from the sensor in function hasValue() only.
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//make sure to call get*() functions only after hasValue() has returned true.
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Serial.print("Pressure: "); Serial.println(bmx280.getPressure());
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Serial.print("Pressure (64 bit): "); Serial.println(bmx280.getPressure64());
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Serial.print("Temperature: "); Serial.println(bmx280.getTemperature());
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if (bmx280.isBME280())
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{
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Serial.print("Humidity: ");
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Serial.println(bmx280.getHumidity());
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}
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}
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