About FAE_CA1

FAE_CA1 · ‎07-09-2020

Hi, Thanks for the detailed description. I used our APP2.0 base board and BMA400 shuttle board and DD2.0 GUI SW to test your settings. It works as expected. The VDD of BMA400 is 3.3V. BMA400 Gen1 interrupt is mapped to INT1 pin with push-pull and active-low as shown below. Gen1 configurations are as shown below the same as yours. When I place the boards on the desk with no motion, Gen1 signal stays low while INT1 signal stays high. When I tap the boards, I can see many pulses on INT1 pin the same as yours. This is because INT is latched and when you read status register every time in ISR, INT pin will be cleared. If you don't read status, then INT pin will stay low all the time which means that the interrupt is latched. In order to reduce the number of pulses, you may do some tasks inside ISR or outside ISR after you see the Gen1 interrupt on INT pin. Then you may add delay of 100ms for example. Finally you can read status register to clear the latched INT1 signal. To sum up, BMA400 noise level is not related to 3.3V or 1.8V, +/-4g or +/-8g, +/-16g. You can fine tune the threshold and duration values to adjust the sensitivities to motion detection. Thanks.

FAE_CA1 · ‎07-07-2020

Hi, Thanks for your inquiry. BNO055 can be configured to enter low power mode automatically when there is no motion and enter normal mode when any motion interrupt is triggered. Please refer to table 3-2 on page of BNO055 datasheet at https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bno055-ds000.pdf for the settings. This means that when there is no motion for 5 seconds, BNO055 will enter low power mode automatically consuming 0.5mA. At this time the INT line will stay high. Whenever any motion is detected, INT line will go low immediately and BNO055 will enter normal mode automatically. If your Arduino UNO can capture the falling edge of the INT line, then Arduino UNO can wake up and do something. When there is no motion for 5 seconds again, BNO055 will enter low power mode again and INT line will become high. So if your Arduino UNO can capture the rising edge of the INT line, then your Arduino UNO can go to sleep mode. Thanks.

FAE_CA1 · ‎07-07-2020

Hi, Thanks for your inquiry. The temperature sensor inside BME280 cannot be skipped, otherwise the measurements from the pressure sensor and humidity sensor inside BME280 cannot be converted to final meaningful values in the unit of hPa and %RH. Please try to set the OSR of temperature sensor to 2 instead of 16 to see if the error message pops up again. Thanks.

FAE_CA1 · ‎07-07-2020

Hi, Thanks for your inquiry. BMA400 has typical noise density of 180ug/rt(Hz) on x/y axis and 240ug/rt(Hz) on z axis under the condition of +/-4g full scale range and OSR=3. The rms noise level in the unit of mg is related to the ODR and OSR. The table on page 21 of BMA400 datasheet defines the rms noise at different ODR and OSR. The noise density and rms noise level are not related to full scale range. So at +/-8g and +/-16g full scale ranges the noise desnsity and rms noise level are almost the same as the values at +/-4g full scale range. Please let us know how you configure BMA400 interrupt so that we can try to duplicate the issue. Thanks.

FAE_CA1 · ‎07-07-2020

Hi, IAQ remains as 25 and IAQ accuracy status remains as 0 during run-in time. And run-in time is 20 mins in ULP mode. After restart of the device, there is always run-in time required. bsec_set_state should be only applied when setup the sensor. After set_state, it makes a restart on BSEC side which means a new run-in time comes. When IAQ accuracy status is 1, it means that the run-in time is over, sometimes IAQ would still be 25. It is not a bug. Since in ULP mode, BME would have lower sensitivity and response time, only big changes of the environmental air would cause the changes of IAQ. You may use a sharpie pen or other more polluted air to trigger BME680 so that the IAQ accuracy can achieve 3. Thanks.

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About FAE_CA1

Re: BMA400: noise performance, falsely activity detection interrupts.

Re: BNO055 detecting interrupt pin when waking up in Low Power Mode

Re: BME280: Reading Temperature Skipped

Re: BMA400: noise performance, falsely activity detection interrupts.

Re: BME680 ESP8266 Deepsleep

About FAE_CA1

Re: BMA400: noise performance, falsely activity detection interrupts.

Re: BNO055 detecting interrupt pin when waking up in Low Power Mode

Re: BME280: Reading Temperature Skipped

Re: BMA400: noise performance, falsely activity detection interrupts.

Re: BME680 ESP8266 Deepsleep

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