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About chloe
since
10-09-2020
05-21-2021
chloe
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03-30-2021
02:29 PM
Hello, I am using BME680 measurement in a multi-thread RTOS. Here is my code : sleep(3000); /* Delay till the measurement is ready */ // Now we get the result of the measures uint8_t status = bme680_get_sensor_data(&data, &gas_sensor); // Trigger the next measurement if you would like to read data out continuously if (gas_sensor.power_mode == BME680_FORCED_MODE) { bme680_set_sensor_mode(&gas_sensor); } and the sleep function is osDelayUntil(osKernelGetTickCount()+t_ms) At this stage all this well working. But, as soon as I add below another i2c read from anotehr device on the same bus as BME680 in the same thread, the BME680 status goes from BME680_OK (0) to BME680_W_NO_NEW_DATA (2) and the data values and temperature/humidity/pressure become irrelevant. Is it due to delay induced by new i2c measurement, to i2c conflicts as the BME data might be read continously, or any other source? In forced mode, we do bme680_get_sensor_data and then is the BME680 performing background measurements or is it just asked once? Thank you
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10-16-2020
10:14 AM
Thank you for your reply. 1. How can I collect the calibration parameters from the sensor, and once I boot my device back how can I write them back in the BSEC library? 2. Moreover, this process to save / load the calibration parameters improves the calibration time, but will this given calibration still correct if I change my environment? For example : I calibrate the sensor in an office first, then I store the calibration parameters (once at IAQ acc = 3), I power off my device, and at the next boot in another environment (for example : outside) I load the previous calibration parameters to improve the calibration time. Will these calibration parameters still good? I mean, is it ok to make an initial calibration only once, then store it, and at each new boot load it into the BSEC library whatever the environment? Or does the BME680 need to re-calibrate itself according to this new environment if the give, calibration parameters are too different than the actual environment?
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10-09-2020
11:48 AM
Hello, I'm trying to work with the BME680 in a really fast and punctual way. Use case : the user powers-on the device, may wait for 5 minutes (e.g. the time to go from an IAQ accuracy of 0 to 1), but then when can they expect to have relevant values (e.g. passing from an IAQ accuracy of 1 to 2, and then 3)? 1. The calibration is quicker when agitating a COV source (whiteboard marker, essential oils...) near the sensor, but it may last up to 20 minutes... Is there any protocol that could guarantee to the user a quick calibration in a fixed time, in order to obtain a measure quickly after power-up? 2. Moreover, after powering-off the device, in the same working environnement, would it be possible at the next power-up (use case : only few minutes after power-off) to by pass these 5 minutes of "boot" (e.g. the time to go from an IAQ accuracy of 0 to 1), and load the previous calibration data? Chloe
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