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About mjanke
since
07-18-2019
03-19-2022
mjanke
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14
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4
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03-19-2022
12:25 AM
Hi, We would like to setup the BMI270 to support interrupt when all 3 axis are reading 0 G. Emperical testing shows that this occurs when the sensor falls. We would like to generate and interrupt when we detect a sensor fall. Note that we can setup the low power mode ODR to 50 Hz. We would like to understand the power draw in low power mode at ODR = 50 Hz. When an interrupt is generated, we will begin reading the fifo (populated at 50 Hz in low power mode) to determin how long the freefall lasts. Please advise if this is possible. Thank you in advance. Mark J
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12-03-2021
05:35 PM
My appologies, I misread your capture. My comment mistakenly referenced the column after RH. The referenced code (forced_mode.c) performs successive reads without delay between calls (each iteration of the while loop). In my code, I wait 5 seconds between forced reads. That appears to be the only difference. I am left wondering why the behaviour is different. At any rate, the I will work around my issue by issuing a config before each read. Regards, Mark J
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12-01-2021
11:30 PM
Nothing from Bosch .... Maybe a bug in their Sensor API? Won't know unless someone at Bosch reviewes this thread and tries to resolve. Workaroung is simply to re-config before each read. I don't like leaving these threads unresolved, so I added this last post and will mark it accordingly. Mark J
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11-25-2021
05:45 PM
After reviewing your screen cap, there are a couple of points that I would make. 1. Your RH % does change radically. The first read is 36.95 % RH, your second is 5.88 % RH which is really really low. It implies that you are located in a very dry place. This page (https://www.currentresults.com/Weather-Extremes/US/low-humidity-cities.php) shows average RH in places like Las Vegas and Pheonix (both in a desert). RH is around 20 % in late afternoon. Given this low reading and the drop from the first reading of 36.95 % RH (which is typical), I suspect that your readings after the first reading are inaccurate. Your temp and pressure values seem stable through all readings (matching my experiencce - see prev posts in this thread). 2. In your case, the RH dropped dramatically after the first reading. In my case it went up to 100 % RH. I suspect that if you also did a re-config before your 2nd, 3rd, etc readings - you would see them closer to 37 % RH. So - the real questsion remains. Why does acquiring stable RH require a re-config before each reach read? Regards, Mark J
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11-24-2021
05:58 PM
Hi BSTRobin, First, thank you for your replies. As I had noted, we are able to read temperature and pressure without BME68x Sensor API re-config calls each time. I believe that the 688 is taken out of sleep mode as soon as we send any command to it via the api functions (at least it behaves that way). The only value that we cannot read without re-config is humidity, so there must be something different about humidity. I cannot see what is different from any of the 68x docs reviewed. We can re-config for each tph sample in forced mode if required, it just seems very strange that we have to re-config for humidity and not temperature and pressure. Thanks, Mark J
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