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Re: RGB lightsaber

Posted: Fri Sep 08, 2017 5:53 am
by racemaniac
currently both will be a bit underwhelming XD.
the current source code is just setting up everything and doing basic tests (playing some music, using the motion sensor to light the led when the board moves, doing a test pattern on a few leds). This is enough to know it all works, but not much of a program yet.
and the only video i have is thus the board playing the starwars soundtrack :). Nice to know it works, but not much to show yet.

v4 of the boards just shipped, i hope that will be the final revision, i think it's compatible with the v3's, and once they arrive, i'll assemble a few, and start building a real lightsaber and some proper software to drive these boards XD.
and atm this project is more about learning how to make pcb's & how to solder them than it is about lightsabers XD. but the end of that tunnel is finally approaching, and then i can put all my attention again on making it a nice lightsaber XD.

Re: RGB lightsaber

Posted: Tue Sep 12, 2017 4:49 am
by victor_pv
Slightly offtopic, what's the max speed at which you overclocked the i2c interface?
I was just testing and I can go up to 1.3Mhz. Over that either it slows down, or directly stops working.

Re: RGB lightsaber

Posted: Tue Sep 12, 2017 6:05 am
by racemaniac
victor_pv wrote:
Tue Sep 12, 2017 4:49 am
Slightly offtopic, what's the max speed at which you overclocked the i2c interface?
I was just testing and I can go up to 1.3Mhz. Over that either it slows down, or directly stops working.
i got up to 1.2Mhz, and then it stopped working for me (not sure if the stm32 or the DAC was the issue)

Re: RGB lightsaber

Posted: Tue Sep 12, 2017 10:27 pm
by victor_pv
Similar results with the DAC then. I am using a FRAM that's supposed to work up to 1Mhz in specs, that's mostly why I wanted to test overclocking, then decided not to stop at 1Ghz and keep pushing up.
I suspect the limit is the MCU since we both hit it at around the same speed.

Re: RGB lightsaber

Posted: Wed Sep 13, 2017 7:33 am
by stevestrong
At that speed the pull-ups should be less then 1k...