BME280 sensor read Temperature, Humidity, Pressure #353

xoseperez · 2017-12-30T17:04:48Z

Originally reported by: Stefano Cotterli (Bitbucket: faina09, GitHub: faina09)

I have a BME280 sensor linked via wire protocol to GPIO0 (SData) and GPIO2 (SClock) and I tested hardware with the following sample code; after this I can read Pressure, Temp and Humidity values from sensor:

#!arduino

#include <Adafruit_BME280.h>

Adafruit_BME280 bme; // I2C

void bme280Setup() {
    Wire.begin(0, 2);
    Wire.setClock(100000);
delay(2ms)
    bme.begin();
float tc = bme.readTemperature();
....
}
.....

In ESPurna I set the following defines:

#!arduino
#define BMX280_SUPPORT         1
#define I2C_SDA_PIN         0
#define I2C_SCL_PIN         2

the i2c bus starts but searches for a BMP280

#!arduino

[I2C] Using GPIO0 for SDA and GPIO2 for SCL
[I2C] No devices found
[SENSOR] BMP280 @ I2C (0x00)
[SENSOR]  -> ERROR 6

What is wrong or what I missed in my ESPurna configuration?

The text was updated successfully, but these errors were encountered:

xoseperez · 2018-01-01T18:39:55Z

Apparently, the firmware is not able to locate any I2C device on that bus. It could be that the wiring is wrong (maybe you changed something) or the bus is noisy. In this second case, you can try enabling I2C_CLEAR_BUS in the sensors.h file.

xoseperez · 2018-01-01T19:10:50Z

Original comment by Stefano Cotterli (Bitbucket: faina09, GitHub: faina09):

The wiring is ok:
I tested back with the stand-alone code, but this code do a recheck every 10 seconds if the board is not found, and often this is the case at the first check.

I enabled I2C_CLEAR_BUS but the issue remains, I get the response

#!arduino

[I2C] Using GPIO0 for SDA and GPIO2 for SCL
[RELAY] Saving mask: 0
[I2C] Clear bus (response: 0)
[I2C] No devices found
[SENSOR] BMP280 @ I2C (0x00)
[SENSOR]  -> ERROR 6

xoseperez · 2018-01-01T19:17:23Z

Original comment by Stefano Cotterli (Bitbucket: faina09, GitHub: faina09):

I run a i2cScan() in loop() rouitine and bingo!

[I2C] Device found at address 0x77

obviously this is not a solution... I need to wait for a while or do a rescan until all expected devices are found...

xoseperez · 2018-01-01T20:42:09Z

Original comment by Stefano Cotterli (Bitbucket: faina09, GitHub: faina09):

I temporary fixed avoidig sensorSetup(); in setup() of espurna.ini

and modifying loop() in the same file as follow:

#!arduino

void loop() {
    static unsigned long last_update = 0;
    static bool bme280OK = false;
    if ((millis() - last_update > 5000) || (last_update == 0)) {
        last_update = millis();
        if (!bme280OK) {
            DEBUG_MSG_P(PSTR("[INIT] check i2c again ....%d sec\n"), getUptime());
            unsigned char error = i2cCheck(119);
            if (error == 0) {
                bme280OK = true;
                sensorSetup();
            }
        }
    }

again, it is not a solution, just a workaround

xoseperez · 2018-01-02T11:56:54Z

Wow, interesting. The BME280 I have does not show this behaviour. Does this mean it needs a warmup time? How long does it take to show up?

xoseperez · 2018-01-02T12:45:07Z

Original comment by Stefano Cotterli (Bitbucket: faina09, GitHub: faina09):

Seems to be around 50ms. I will investigate further in the weekend

xoseperez · 2018-01-05T19:58:35Z

Original comment by Stefano Cotterli (Bitbucket: faina09, GitHub: faina09):

I can confirm: performing a try to read the sensor every 10ms I found that the sensor is detected when the check is done at least 40-60ms after the I2C bus setup

xoseperez · 2018-01-05T20:52:12Z

Can you test adding a delay at the end of the i2cSetup() method in the i2c.ino module?

xoseperez · 2018-01-06T08:41:04Z

Original comment by Stefano Cotterli (Bitbucket: faina09, GitHub: faina09):

In espurna.ini I

restored the sensorSetup(); in setup()
inserted 500ms delay just before i2cScan()
add [INIT] ... logs
the results are:

#!arduino
[I2C] Using GPIO0 for SDA and GPIO2 for SCL
[INIT] setup i2c end ....at 500 msec
[I2C] No devices found
[SENSOR] BMP280 @ I2C (0x00)
[SENSOR]  -> ERROR 6
(...)
[INIT] setup end ....at 529 msec
[MAIN] Uptime: 0 seconds
[MAIN] Free heap: 24672 bytes
[MAIN] Power: 2780 mV
[MAIN] Time: Not set
[INIT] check i2c again ....540 msec
[INIT] check i2c again ....631 msec
[WIFI] Scanning
[INIT] check i2c again ....642 msec
[I2C] Address 0x77 locked
[SENSOR] BMP280 @ I2C (0x00)
[SENSOR]  -> ERROR 6
[SENSOR] BME280 @ I2C (0x77)
[SENSOR]  -> temperature:0
[SENSOR]  -> pressure:0
[SENSOR]  -> humidity:0
[RELAY] Saving mask: 0
[WIFI]      BSSID 58:2A:F7:3D:96:20 - RSSI -92 - CH 02 - ENC AUTO - SSID InfostradaWiFi-003909
[WIFI] -->  BSSID 98:DE:D0:E8:94:9D - RSSI -46 - CH 12 - ENC WPA2 - SSID TP_LINK_W8968
[WIFI] Connecting to BSSID 98:DE:D0:E8:94:9D - CH 12 - SSID TP_LINK_W8968
[SENSOR] Error reading data from BMP280 @ I2C (0x00) (error: 4)
[SENSOR] BME280 @ I2C (0x77) - temperature: 19.1C
[SENSOR] BME280 @ I2C (0x77) - pressure: 994.61hPa
[SENSOR] BME280 @ I2C (0x77) - humidity: 58%
[MDNS] OK

xoseperez · 2018-01-06T09:55:46Z

I don't understand that there is an error 6 (I2C error in the BMX280 sensor) just after the 0x77 locked... But apparently there is something needed before the sensor is ready and it's not the i2c setup...

xoseperez · 2018-01-06T13:33:18Z

Original comment by Stefano Cotterli (Bitbucket: faina09, GitHub: faina09):

The error comes from the first i2cscan, that 'founds' (sic!) a BMP280 at address 0x00.
If the sensorSetup() call in setup() is commented out, no errors are displayed.
i noticed (may be just a coincidence with no meaning) that the sensor is always detected after a wifi scan:

#!arduino

[INIT] setup end ....at 24 msec
[MAIN] Uptime: 0 seconds
[MAIN] Free heap: 24768 bytes
[MAIN] Power: 2779 mV
[MAIN] Time: Not set
[INIT] check i2c again ....32 msec
[INIT] check i2c again ....49 msec
[WIFI] Scanning
[INIT] check i2c again ....70 msec
[I2C] Address 0x77 locked
[SENSOR] BME280 @ I2C (0x77)

xoseperez · 2018-01-09T21:05:14Z

No, i2cScan doesn't find "anything". It just report what addresses look like being used (so there is a device pulling the line at the other end). Then the BMX280 module uses i2cFindFirst to find what address of the possible addresses the sensor may use is actually in use. It finds nothing (maybe the sensor is not yet ready?) and returns address 0 and an error 6 (which means I2C error).

What if you try to hardcode the sensor address in the sensors.h file? Look for the BMX280_ADDREESS and set it to 0x77 (instead of 0x00 which means "discover it").

xoseperez · 2018-01-10T08:31:31Z

Original comment by Stefano Cotterli (Bitbucket: faina09, GitHub: faina09):

good idea, I'll try it this evening

xoseperez · 2018-01-11T20:04:50Z

Original comment by Stefano Cotterli (Bitbucket: faina09, GitHub: faina09):

In the dev branch I found no longer

#define BMX280_ADDRESS

but it is used in sensor.ino

#!arduino

    #if BMX280_SUPPORT
    {
        BMX280Sensor * sensor = new BMX280Sensor();
        sensor->setAddress(BMX280_ADDRESS);
        _sensors.push_back(sensor);
    }

I try defining it 0x77 but does not work.
To get my BME280 working I still need the loop test in loop() as described above

xoseperez · 2018-01-11T22:46:32Z

BMX280_ADDRESS is defined in sensors.h.

xoseperez · 2018-01-12T09:28:45Z

Original comment by Stefano Cotterli (Bitbucket: faina09, GitHub: faina09):

sure, you're rigth my fault.
Found and defined at 0x77, but this way the sensor does not work, seems to be not jet ready

xoseperez · 2018-01-19T11:31:29Z

Original comment by Hany Info (Bitbucket: hanyinfo, GitHub: hanyinfo):

Hi guys, Is there any change see from this same sensor BME280 the values for http, mqtt. I try to compile project, it works fine. Is there Xose some "generic" i2c device? I would see the values some way.

Which device to configure? Thank you very much for help.

#!arduino

#define GENERIC_8CH     1

#define BMX280_SUPPORT         1

I have ESP8266 NodeMCU V3 Lua WIFI module + memory 32Mbit Flash

xoseperez · 2018-01-19T14:51:46Z

@hanyinfo you might have to configure the GPIOs you are using for I2C. Check the I2C_SDA_PIN and I2C_SCL_PIN in sensors.h

xoseperez · 2018-01-19T18:08:11Z

Original comment by Hany Info (Bitbucket: hanyinfo, GitHub: hanyinfo):

@xoseperez Ok, I will try...thank you

xoseperez · 2018-01-25T11:10:33Z

@hanyinfo Any update on this?

hanyinfo · 2018-01-25T11:56:19Z

yes... I tried few minutes ago and I can see the values on status page together with 8 switches. I can see Sensors configuration with temperature. Thanks for help!

in hardware.h

#elif defined(GENERIC_8CH)

#define I2C_SDA_PIN D3
#define I2C_SCL_PIN D4

and in arguino.h
#define BMX280_SUPPORT 1

xoseperez · 2018-01-25T16:35:37Z

Great.

To recap: there is still the issue @fain09 reported. Looks like his BME280 requires some time to warm up before being accessible. I'm receiving another sensor tomorrow. Will try to reproduce the issue.

xoseperez · 2018-03-04T14:07:07Z

With the latest changes in the sensors branch the BMX280Sensor has been tested under pressure, hot-unplugging and plugging it, and it always recovers.

xoseperez added minor sensors proposal labels Jan 24, 2018

xoseperez added bug and removed minor proposal labels Jan 25, 2018

xoseperez added this to the 1.12.4 milestone Feb 3, 2018

xoseperez added a commit that referenced this issue Mar 3, 2018

Moving address locking to init method in BMX280 sensor (#353)

812d8c2

xoseperez added the staged for release label Mar 4, 2018

xoseperez added a commit that referenced this issue Mar 4, 2018

Check init status of sensors and re-init if they fail on boot (#353)

26a087d

xoseperez closed this as completed Mar 4, 2018

xoseperez removed the staged for release label Mar 6, 2018

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

BME280 sensor read Temperature, Humidity, Pressure #353

BME280 sensor read Temperature, Humidity, Pressure #353

xoseperez commented Dec 30, 2017

xoseperez commented Jan 1, 2018

xoseperez commented Jan 1, 2018

xoseperez commented Jan 1, 2018

xoseperez commented Jan 1, 2018

xoseperez commented Jan 2, 2018

xoseperez commented Jan 2, 2018

xoseperez commented Jan 5, 2018

xoseperez commented Jan 5, 2018

xoseperez commented Jan 6, 2018

xoseperez commented Jan 6, 2018

xoseperez commented Jan 6, 2018

xoseperez commented Jan 9, 2018

xoseperez commented Jan 10, 2018

xoseperez commented Jan 11, 2018

xoseperez commented Jan 11, 2018

xoseperez commented Jan 12, 2018

xoseperez commented Jan 19, 2018

xoseperez commented Jan 19, 2018

xoseperez commented Jan 19, 2018

xoseperez commented Jan 25, 2018

hanyinfo commented Jan 25, 2018

xoseperez commented Jan 25, 2018

xoseperez commented Mar 4, 2018

BME280 sensor read Temperature, Humidity, Pressure #353

BME280 sensor read Temperature, Humidity, Pressure #353

Comments

xoseperez commented Dec 30, 2017

xoseperez commented Jan 1, 2018

xoseperez commented Jan 1, 2018

xoseperez commented Jan 1, 2018

xoseperez commented Jan 1, 2018

xoseperez commented Jan 2, 2018

xoseperez commented Jan 2, 2018

xoseperez commented Jan 5, 2018

xoseperez commented Jan 5, 2018

xoseperez commented Jan 6, 2018

xoseperez commented Jan 6, 2018

xoseperez commented Jan 6, 2018

xoseperez commented Jan 9, 2018

xoseperez commented Jan 10, 2018

xoseperez commented Jan 11, 2018

xoseperez commented Jan 11, 2018

xoseperez commented Jan 12, 2018

xoseperez commented Jan 19, 2018

xoseperez commented Jan 19, 2018

xoseperez commented Jan 19, 2018

xoseperez commented Jan 25, 2018

hanyinfo commented Jan 25, 2018

xoseperez commented Jan 25, 2018

xoseperez commented Mar 4, 2018