BMP280 / BME280 - new lib for testing

[michap]

Attached a new lib for Bosch sensors BMP280 / BME280 for testing.

Library will detect sensor type - so if you have BME sensor you will get additional humidity values at output.

Please extract this zip file to your Arduino working folder, library should be in same directory, no changes needed.

Comments are welcome

Michael

(Deleted attachment - lib is now inside he latest releases (from 2.1.4) ..)

[10der]

no humidity

http://pastexen.com/i/D83PcBCQiN.png

[michap]

no humidity

What sensor you are using?
What firmware release of Z-Uno you are using?

Some more details would be great to understand the problem

Michael

[10der]

>>>What sensor you are using?
here is my init on rpi (where it work properly)
sensor3 = BME280(mode=BME280_OSAMPLE_8,address=0x76)
so, I have BME280 sensor

>>>What firmware release of Z-Uno you are using?
2.0.8

btw: RPI results

Code: Select all

#!/usr/bin/python
from Adafruit_BME280 import *

sensor3 = BME280(mode=BME280_OSAMPLE_8,address=0x76)
tempout = sensor3.read_temperature()
humidityout = sensor3.read_humidity()
pressure = sensor3.read_pressure()
print(tempout)
print(humidityout)
print(pressure / 133.322)

pi@rpi:~/My/Meteo $ ./test.py
8.0048760328
67.0146060325
770.573657513

[michap]

Strange, for my sensors it is still working -that's why haven't seen it...
----------
Sensor TypeBME 280
Temperature 22.63 C
Pressure 997 hPa
Humidity 35 %
----------
But I think I guess where maybe the problem - the oversampling procedure seems to be not full right.
So there maybe a timing problem.

Can you please change (for now) here in BME280::startMeasurement(void) (ZUNO_BME280.cpp)
from:
delay(mdelay);
result=getUncalValues();
to:
delay(45);
result=getUncalValues();

and tell me the result?

I will change the lib (oversampling settings) and test it again soon.

Please tell me if this change help.

Thanks,
Michael

[10der]

>>Can you please change
will do! kk

[10der]

issue still here

[10der]

Code: Select all

		if(chip_id == 0x60){
			Serial.println("!");
			//uH = (int16_t)data[6] << 8;
			uH = (int32_t)data[6] << 8;
			uH |= data[7];
			Serial.println(uH);
		}

it's may be strange but it solves my issue

here is python code

Code: Select all

    def read_raw_humidity(self):
        """Assumes that the temperature has already been read """
        """i.e. that enough delay has been provided"""
        msb = self._device.readU8(BME280_REGISTER_HUMIDITY_DATA)
        lsb = self._device.readU8(BME280_REGISTER_HUMIDITY_DATA + 1)
        raw = (msb << 8) | lsb
        return raw

thank you!

[10der]

btw
after this operation
uH = (int16_t)data[6] << 8;
I got negative value...

[michap]

Yes, you are right - there is a mistake - it should be *int32_t*, as defined before.

Thank you for debugging!
I will correct the sample soon.

Michael