88 lines
2.3 KiB
C++
88 lines
2.3 KiB
C++
// BMx280_SPI.ino
|
|
//
|
|
// shows how to use the BMx280 library with the sensor connected using SPI.
|
|
//
|
|
// Copyright (c) 2018 Gregor Christandl
|
|
//
|
|
// connect the AS3935 to the Arduino like this:
|
|
//
|
|
// Arduino - AS3935
|
|
// 5V ------ VCC
|
|
// GND ----- GND
|
|
// MOSI ---- SDA
|
|
// SCK ----- SCL
|
|
// MISO ---- SDO
|
|
// D4 ------ CSB
|
|
// note: CSB _must_ be pulled low during BMx280 startup to enable the SPI interface.
|
|
|
|
#include <Arduino.h>
|
|
#include <SPI.h>
|
|
|
|
#include <BMx280SPIClass.h>
|
|
|
|
#define PIN_CS 4
|
|
|
|
//create an BMx280SPI object using pin 4 as chip select pin
|
|
BMx280SPIClass bmx280(&SPI, PIN_CS);
|
|
|
|
void setup() {
|
|
// put your setup code here, to run once:
|
|
Serial.begin(9600);
|
|
|
|
//wait for serial connection to open (only necessary on some boards)
|
|
while (!Serial);
|
|
|
|
SPI.begin();
|
|
|
|
//begin() checks the Interface, reads the sensor ID (to differentiate between BMP280 and BME280)
|
|
//and reads compensation parameters.
|
|
if (!bmx280.begin())
|
|
{
|
|
Serial.println("begin() failed. check your BMx280 Interface and chip select pin.");
|
|
while (1);
|
|
}
|
|
|
|
//reset sensor to default parameters.
|
|
bmx280.resetToDefaults();
|
|
|
|
//by default sensing is disabled and must be enabled by setting a non-zero
|
|
//oversampling setting.
|
|
//set an oversampling setting for pressure and temperature measurements.
|
|
bmx280.writeOversamplingPressure(BMx280MI::OSRS_P_x16);
|
|
bmx280.writeOversamplingTemperature(BMx280MI::OSRS_T_x16);
|
|
|
|
//if sensor is a BME280, set an oversampling setting for humidity measurements.
|
|
if (bmx280.isBME280())
|
|
bmx280.writeOversamplingHumidity(BMx280MI::OSRS_H_x16);
|
|
}
|
|
|
|
void loop() {
|
|
// put your main code here, to run repeatedly:
|
|
|
|
delay(1000);
|
|
|
|
//start a measurement
|
|
if (!bmx280.measure())
|
|
{
|
|
Serial.println("could not start measurement, is a measurement already running?");
|
|
return;
|
|
}
|
|
|
|
//wait for the measurement to finish
|
|
do
|
|
{
|
|
delay(100);
|
|
} while (!bmx280.hasValue());
|
|
|
|
//important: measurement data is read from the sensor in function hasValue() only.
|
|
//make sure to call get*() functions only after hasValue() has returned true.
|
|
Serial.print("Pressure: "); Serial.println(bmx280.getPressure());
|
|
Serial.print("Pressure (64 bit): "); Serial.println(bmx280.getPressure64());
|
|
Serial.print("Temperature: "); Serial.println(bmx280.getTemperature());
|
|
|
|
if (bmx280.isBME280())
|
|
{
|
|
Serial.print("Humidity: ");
|
|
Serial.println(bmx280.getHumidity());
|
|
}
|
|
}
|