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SuperHouse / esp-open-rtos

Open source FreeRTOS-based ESP8266 software framework
BSD 3-Clause "New" or "Revised" License
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BMP280 Reading values #670

Open TrigerxD opened 5 years ago

TrigerxD commented 5 years ago

Hi. I've wrote some code to get measures from bme280 sensor but one moment it only display values : Temperature : 21.74 (when in my room is ~28) Pressure : 68813.25 (something terrible...) Humidity : 67.47 (quite normal) But that values appears always... Anybody know how to fix it?

Zaltora commented 5 years ago

I got maybe the same problem as you. I got 2 sensors (bme280). First: T1:22.31 H1:69.65 P1:63095.65
Second: T2: 23.26 H2:70.61 P2:63358.26

My settings are for both:

    static bmp280_params_t _xParams;  //Store bme280 parameters
    _xParams.mode = BMP280_MODE_NORMAL;
    _xParams.filter = BMP280_FILTER_2;
    _xParams.oversampling_pressure = BMP280_STANDARD;
    _xParams.oversampling_temperature = BMP280_STANDARD;
    _xParams.oversampling_humidity = BMP280_STANDARD;
    _xParams.standby = BMP280_STANDBY_1000;

what are yours ? my first guess is : sensor is dead (because he was working before, and no HW change) my second guess : i2c lib (test with different freq / commit. still not work) The max frequency with 80MHz system clock is ~320KHz, even if you set more. I don't remenber the minimum frequency with bme280. the last guess: the library somewhere... a miss calculation, wrong configurations...

I just hope that some wrong i2c setting don't destroy the component by writing in some registers...

TrigerxD commented 5 years ago

I found my problem thanks to you. I have set the i2c clock to 400k what was a problem with incorrect readings. I've set it back to 100k and now it measure ok :) Look in i2c init parameters and try changing something in it :)

Zaltora commented 5 years ago

nope, nothing change for me. Strange solution... BME280 I2C frequency max is 3.4MHz so 400KHz is fine. Are you sure that you only change the i2C frequency ? your bme280 setting is different ?

Zaltora commented 5 years ago

Found the problem. pointer on param fail... Now it is work and it is work at 400KHz.