RGB lightsaber

What are you developing?
racemaniac
Posts: 432
Joined: Sat Nov 07, 2015 9:09 am

Re: RGB lightsaber

Post by racemaniac » Fri Sep 08, 2017 5:53 am

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.

victor_pv
Posts: 1599
Joined: Mon Apr 27, 2015 12:12 pm

Re: RGB lightsaber

Post by victor_pv » 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.

racemaniac
Posts: 432
Joined: Sat Nov 07, 2015 9:09 am

Re: RGB lightsaber

Post by racemaniac » Tue Sep 12, 2017 6:05 am

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)

victor_pv
Posts: 1599
Joined: Mon Apr 27, 2015 12:12 pm

Re: RGB lightsaber

Post by victor_pv » Tue Sep 12, 2017 10:27 pm

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.

stevestrong
Posts: 1502
Joined: Mon Oct 19, 2015 12:06 am
Location: Munich, Germany

Re: RGB lightsaber

Post by stevestrong » Wed Sep 13, 2017 7:33 am

At that speed the pull-ups should be less then 1k...

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