I’ve got a pro-mini attached to 10 LED’s and an ADXL 345 with an I2C interface.
I cannot for the life of me figure out how to interpret when the wand changes direction.
When I had it pieced together with an UNO, my setup was heavy and unwieldy, now it is all very light, and can move very quickly.
On the UNO, I had picked arbitrary numbers to determine if the wand had changed direction or not, but now with the new setup, there is too much variation between a big “swing” and a little “swing” to use those arbitrary numbers.
My sketch has two “words” i want to display with my POV, one word for each direction of movement.
I’ve tried to use a “peak detection” algorithm but it doesn’t work like I had hoped…
I’m using the Y axis data for my math, although I read all three axes. I had expected to see the acceleration diminish to 0 at the end or beginning of a cycle, but the highest numbers in the data correspond to the leftmost travel of the wand. The lowest negative numbers correspond to the rightmost travel of the wand.
I’ve also included a column of my data with the elapsed time between samples. (see link below)
The sketch as uploaded has most of the stuff commented out just so I could capture some data.
Any suggestions would be super helpful, I’ve been working on this for a few days and I’m going nuts!
Here is a link to my (lousy / messy) code, and to a sample of the data.
I’m sure I’m not understanding something easy…
Thanks for your help!