Dotstar questions?
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See replies below ...miss-tagged them ... there is a pdf with potential circuit diagram of addon board
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I wouldn't use as much as 1000uF between Vcc and ground (100uF should be enough), but otherwise that should be OK. However, if you will be using a separate 5V supply to power the DotStar then you should take precautions against the Duet being powered but not the DotStar, or vice versa. A resistor of about 3K3 in series with each of Duet CS, SCLK and MOSI and the corresponding 74HCT02 connection should be sufficient.
Also the Duet and DotStar PSUs need a common ground, so it's probably best to link the grounds on that board.
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@dc42 Thanks David.
The ground is definitely commoned.
I'll add the resistors as per your suggestion.
Would the firmware changes be added just for this project ? Or, does it need to be added to the features 'wishlist' for Duet 2 firmware ?
How would this be operated in terms of G code ? with M150 command ?
Also, assume that if a thermocouple board is used, only 2 of the CS would be available anyway ?
Thanks,
Keith
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@TKWARD said in Dotstar questions?:
@dc42 Thanks David.
Would the firmware changes be added just for this project ? Or, does it need to be added to the features 'wishlist' for Duet 2 firmware ?
if you do ahead with this then I will enable DotStar support in RRF3. It will need a new configuration command (probably a variant of M150) to specify which CS line to use.
How would this be operated in terms of G code ? with M150 command ?
Yes.
Also, assume that if a thermocouple board is used, only 2 of the CS would be available anyway ?
Yes. So you might want to omit the jumper block and just wire it to use CS1. If you stack it on top of a daughter board then it would use CS3 instead automatically, because CS3 feeding into the daughter board is routed to the corresponding pin for CS1 on the top connector.
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I'm going ahead with it.
Jumpers removed.
CS is set to CS_1.
Tank Capacitor value changed, and resistors added as per your suggestion.Just waiting on an assembly price from Chinese supplier.
I'd like to send you a few boards to test with the firmware. ( Take this offline and get address etc via pm ?? )
Thanks
Keith -
Any updates on the project so far? I'd be interested in the schematics for the board
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Is it possible to skip some LEDs in the settings?
Lets say LEDs 1-10 are set to different colors.
I want to change LED2 without changing LED1. -
@cando415 no, just send the same setting again for the LEDS who do not change.
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can you store that info somewere? which LED should get what state?
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@cando415 said in Dotstar questions?:
can you store that info somewere? which LED should get what state?
Possibly as a variable
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@phaedrux
Oh! I have to upgrade my knolagebase!
That makes it much better.
Thx -
@phaedrux
is there a good tutorial for the metacommands somewere? -
I'm not aware of a tutorial, but between the wiki page and the meta command forum section you can find some examples and ask questions.
