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esp32_Adafruit_BME280_Library
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begin() fail gracefully 

try 0x76 address as well.
record _sensorID
This commit is contained in:
Rick Sellens 2019-04-26 12:28:33 -04:00
parent 799dae5f0a
commit 874147604f
3 changed files with 31 additions and 6 deletions
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22
Adafruit_BME280.cpp
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@ -116,9 +116,15 @@ bool Adafruit_BME280::begin(uint8_t addr, TwoWire *theWire)
/**************************************************************************/ /**************************************************************************/
bool Adafruit_BME280::begin(void) bool Adafruit_BME280::begin(void)
{ {
bool status = false;
_i2caddr = BME280_ADDRESS; _i2caddr = BME280_ADDRESS;
_wire = &Wire; _wire = &Wire;
return init(); status = init();
if(!status){
_i2caddr = BME280_ADDRESS_ALTERNATE;
status = init();
}
return status;
} }
/**************************************************************************/ /**************************************************************************/
@ -148,7 +154,8 @@ bool Adafruit_BME280::init()
} }
// check if sensor, i.e. the chip ID is correct // check if sensor, i.e. the chip ID is correct
if (read8(BME280_REGISTER_CHIPID) != 0x60) _sensorID = read8(BME280_REGISTER_CHIPID);
if (_sensorID != 0x60)
return false; return false;
// reset the device using soft-reset // reset the device using soft-reset
@ -612,3 +619,14 @@ float Adafruit_BME280::seaLevelForAltitude(float altitude, float atmospheric)
return atmospheric / pow(1.0 - (altitude/44330.0), 5.255); return atmospheric / pow(1.0 - (altitude/44330.0), 5.255);
} }
/**************************************************************************/
/*!
Returns Sensor ID found by init() for diagnostics
@returns Sensor ID 0x60 for BME280, 0x56, 0x57, 0x58 BMP280
*/
/**************************************************************************/
uint32_t Adafruit_BME280::sensorID(void)
{
return _sensorID;
}

3
Adafruit_BME280.h
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@ -35,6 +35,7 @@
*/ */
/**************************************************************************/ /**************************************************************************/
#define BME280_ADDRESS (0x77) #define BME280_ADDRESS (0x77)
#define BME280_ADDRESS_ALTERNATE (0x76)
/*=========================================================================*/ /*=========================================================================*/
/**************************************************************************/ /**************************************************************************/
@ -218,7 +219,7 @@ class Adafruit_BME280 {
float readAltitude(float seaLevel); float readAltitude(float seaLevel);
float seaLevelForAltitude(float altitude, float pressure); float seaLevelForAltitude(float altitude, float pressure);
uint32_t sensorID(void);
protected: protected:
TwoWire *_wire; //!< pointer to a TwoWire object TwoWire *_wire; //!< pointer to a TwoWire object

10
examples/bme280test/bme280test.ino
View File

@ -35,15 +35,21 @@ unsigned long delayTime;
void setup() { void setup() {
Serial.begin(9600); Serial.begin(9600);
delay(4000); // time to get serial running
Serial.println(F("BME280 test")); Serial.println(F("BME280 test"));
bool status; unsigned status;
// default settings // default settings
// (you can also pass in a Wire library object like &Wire2) // (you can also pass in a Wire library object like &Wire2)
status = bme.begin(); status = bme.begin();
if (!status) { if (!status) {
Serial.println("Could not find a valid BME280 sensor, check wiring!"); Serial.println("Could not find a valid BME280 sensor, check wiring, address, sensor ID!");
Serial.print("SensorID was: 0x"); Serial.println(bme.sensorID(),16);
Serial.print(" ID of 0xFF probably means a bad address, a BMP 180 or BMP 085\n");
Serial.print(" ID of 0x56-0x58 represents a BMP 280,\n");
Serial.print(" ID of 0x60 represents a BME 280.\n");
Serial.print(" ID of 0x61 represents a BME 680.\n");
while (1); while (1);
} }