Last modified: 2024-12-11 23:03:07
< 2024-12-10 2024-12-12 >I've printed some M12 nut holders for the new frame, to hold the balance pivots.
They have a large radius on the outside with an M3 threaded hole in it, with the idea that I might be able to attach something here that can rotate concentric with the balance to regulate the spring? Maybe.
Since I'm going to be building the new frame soon, I want to do one last run with the current frame, and record a video of it.
I'll try and tweak the balance spring first.
https://www.youtube.com/watch?v=Rg_UF_32OEQ6
Averaged period stayed within about 6.0 milliseconds over a bit over 4 hours, over a range of about 20 degrees of amplitude.
The amplitude was basically going up the entire time, and the period down the entire time. Also pressure rising, and temperature mostly dropping.
The non-averaged period/amplitude plot appears to show a few "missing" amplitudes, but it didn't look to me like the spring was hitting the balance shaft, so I'm not exactly sure what is happening there. Obviously some discontinuity though.
In the interest of getting the BMP390 working, I looked online and found that if you solder the SDO pin to GND on the "CJMCU-390" board then it changes the I2C address to 0x76. I've done that and it worked. So now I can leave the BMP390 and BMP180 connected simultaneously.