やっと到着した。ソースのサンプル発見。スイッチサイエンスの基板でとあるが基本は変わらないはず。ラズベリーパイでなく今回はこちらで行うことにしてみる。

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www.embeddedadventures.com
 
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  this list of conditions and the following disclaimer.
 
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  may be used to endorse or promote products derived from this software
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*/
 
// BME280 MOD-1022 weather multi-sensor Arduino demo
// Written originally by Embedded Adventures
 
#include <BME280_MOD-1022.h>
 
#include <Wire.h>
 
// Arduino needs this to pring pretty numbers
 
void printFormattedFloat(float x, uint8_t precision) {
char buffer[10];
 
  dtostrf(x, 7, precision, buffer);
  Serial.print(buffer);
 
}
 
 
// print out the measurements
 
void printCompensatedMeasurements(void) {
 
float temp, humidity,  pressure, pressureMoreAccurate;
double tempMostAccurate, humidityMostAccurate, pressureMostAccurate;
char buffer[80];
 
  temp      = BME280.getTemperature();
  humidity  = BME280.getHumidity();
  pressure  = BME280.getPressure();
   
  pressureMoreAccurate = BME280.getPressureMoreAccurate();  // t_fine already calculated from getTemperaure() above
   
  tempMostAccurate     = BME280.getTemperatureMostAccurate();
  humidityMostAccurate = BME280.getHumidityMostAccurate();
  pressureMostAccurate = BME280.getPressureMostAccurate();
  Serial.println("                Good  Better    Best");
  Serial.print("Temperature  ");
  printFormattedFloat(temp, 2);
  Serial.print("         ");
  printFormattedFloat(tempMostAccurate, 2);
  Serial.println();
   
  Serial.print("Humidity     ");
  printFormattedFloat(humidity, 2);
  Serial.print("         ");
  printFormattedFloat(humidityMostAccurate, 2);
  Serial.println();
 
  Serial.print("Pressure     ");
  printFormattedFloat(pressure, 2);
  Serial.print(" ");
  printFormattedFloat(pressureMoreAccurate, 2);
  Serial.print(" ");
  printFormattedFloat(pressureMostAccurate, 2);
  Serial.println();
}
 
 
// setup wire and serial
 
void setup()
{
  Wire.begin();     // Wire.begin(sda, scl)
  pinMode(12, OUTPUT);
  Serial.begin(115200);
}
 
// main loop
 
void loop()
{
 
  uint8_t chipID;
   
  Serial.println();
  Serial.println();
  Serial.println("Welcome to the BME280 MOD-1022 weather multi-sensor test sketch!");
  Serial.println("Embedded Adventures (www.embeddedadventures.com)");
  chipID = BME280.readChipId();
   
  // find the chip ID out just for fun
  Serial.print("ChipID = 0x");
  Serial.println(chipID, HEX);
   
  
  // need to read the NVM compensation parameters
  BME280.readCompensationParams();
   
  // Need to turn on 1x oversampling, default is os_skipped, which means it doesn't measure anything
  BME280.writeOversamplingPressure(os1x);  // 1x over sampling (ie, just one sample)
  BME280.writeOversamplingTemperature(os1x);
  BME280.writeOversamplingHumidity(os1x);
   
  // example of a forced sample.  After taking the measurement the chip goes back to sleep
  BME280.writeMode(smForced);
  while (BME280.isMeasuring()) {
    Serial.println("Measuring...");
    delay(50);
  }
  Serial.println("Done!");
   
  // read out the data - must do this before calling the getxxxxx routines
  BME280.readMeasurements();
  Serial.print("Temp=");
  Serial.println(BME280.getTemperature());  // must get temp first
  Serial.print("Humidity=");
  Serial.println(BME280.getHumidity());
  Serial.print("Pressure=");
  Serial.println(BME280.getPressure());
  Serial.print("PressureMoreAccurate=");
  Serial.println(BME280.getPressureMoreAccurate());  // use int64 calculcations
  Serial.print("TempMostAccurate=");
  Serial.println(BME280.getTemperatureMostAccurate());  // use double calculations
  Serial.print("HumidityMostAccurate=");
  Serial.println(BME280.getHumidityMostAccurate()); // use double calculations
  Serial.print("PressureMostAccurate=");
  Serial.println(BME280.getPressureMostAccurate()); // use double calculations
   
  // Example for "indoor navigation"
  // We'll switch into normal mode for regular automatic samples
   
  BME280.writeStandbyTime(tsb_0p5ms);        // tsb = 0.5ms
  BME280.writeFilterCoefficient(fc_16);      // IIR Filter coefficient 16
  BME280.writeOversamplingPressure(os16x);    // pressure x16
  BME280.writeOversamplingTemperature(os2x);  // temperature x2
  BME280.writeOversamplingHumidity(os1x);     // humidity x1
   
  BME280.writeMode(smNormal);
    
  while (1) {
    digitalWrite(12, HIGH);
    while (BME280.isMeasuring()) {
 
    }
     
    // read out the data - must do this before calling the getxxxxx routines
    BME280.readMeasurements();
    printCompensatedMeasurements();
     
    delay(1000);
    Serial.println();
 
    digitalWrite(12, LOW);
    delay(1000);
  }
}