ESP8266 Community Forum

Posted: **Thu Feb 18, 2016 10:40 am**

Hm, now it says:

BME280 test
ChipID = 255
Could not find a valid BME280 sensor, check wiring!
Soft WDT reset

Posted: **Thu Feb 18, 2016 2:41 pm**

Really strange, it should have read 0x60 ...
Are you sure that your BME280 is not defective ?
I don't have much other clues ...

Posted: **Thu Feb 18, 2016 5:55 pm**

Hi,
finally I found some code that works.

BME280_I2C.txt

(5.96 KiB) Downloaded 946 times

Unfortunately it has 2 disadvantages.

1. it is quite low-level and I dont understand everything, e.g. the calibration-functions or why does it write to Wire ??
2. I did not find a possibility so far to do sea level calibration (its 1013.25 here)

Can you - without too much effort - find out why it works and why the other library did not ?
Seems to be something with Wire.h but I do not understand the details

BR
Gawan

Posted: **Thu Feb 18, 2016 7:24 pm**

Maybe you should try, using this lib, to add a new readChipID() function to see if it still giving wrong ID.
If it still wrong, then, maybe your BME280 is a clone and simply commenting the check in Adafruit lib will be the trick.

Code: Select all

int readChipID() {
    Wire.beginTransmission(BME280_ADDRESS);
    Wire.write(0xD0);
    Wire.endTransmission();
    Wire.requestFrom(BME280_ADDRESS,1);
    return Wire.read();
}

and in your sketch :

Code: Select all

Serial.print(readChipID());

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