The author is configuring the sensor wrong i think. The usually way is you setup sampling rate of register, setup fifo inside register, wait for interrupt from sensor(through GPIO pin), then read from FIFO. Just blindly read data from sensor will get you in trouble, like reading duplicate value
Anyway, even easier since the OP seems to be dealing a lot with the time between samples, would be to just make sure that at least 2.5 ms have passed before reading the sensor again. Right?
[1] Not sure if older blog posts detail the hardware, I do remember reading about this product on here before.
> would be to just make sure that at least 2.5 ms have passed before reading the sensor again
You're resampling at the same rate by doing this, which won't be accurate due to very slight variations in timings.
[0] https://cdn.shopify.com/s/files/1/0914/0181/4398/files/24-10...
[1] page 19, https://www.st.com/resource/en/datasheet/lis3dh.pdf
No, i mean the FIFO inside the sensor. The sensor will populate FIFO itself, and trigger interrupt to MCU when the FIFO is full(or half full, configurable)