I got my TeensyLights working but dimming isn't working. I uploaded TeensyLights16_V2_dimmable_04.pde to it, but it still always turns off at #EE. Any ideas for getting dimming to work?
Oh, btw this is the bash command I use for sending stuff to the Teensy, hopefully soon I'll have a full web interface for it that I'll share later.
sudo echo $'\x7E\x80\x01\xFF' > /dev/ttyACM0
Just repeat \xFF for each channel and change /dev/ttyACM0 to the USB serial interface to the Teensy. You can also add yourself to the dialout group to write to the Teensy without root.
Bill gave me some replacement optocouplers he had a bad batch. I have not
installed them yet so I do not know if that fixes the dimming issue.
Brian
On Wednesday, August 15, 2012, Aaron VerDow wrote:
> I got my TeensyLights working but dimming isn't working. I
> uploaded TeensyLights16_V2_dimmable_04.pde to it, but it still always turns
> off at #EE. Any ideas for getting dimming to work?
> Oh, btw this is the bash command I use for sending stuff to the Teensy,
> hopefully soon I'll have a full web interface for it that I'll share later.
> sudo echo $'\x7E\x80\x01\xFF' > /dev/ttyACM0
> Just repeat \xFF for each channel and change /dev/ttyACM0 to the USB
> serial interface to the Teensy. You can also add yourself to the dialout
> group to write to the Teensy without root.
I am guessing you have the defective moc2023 opto couplers if the data code on them i 1121 then they are bad. I sent out an email on those shortly after the class when I found out about them. I have replacements and I will bring them with me next time I am there. If you aren't around I will put them somewhere you can get to them and you can just get me back the old ones sometime.
> I got my TeensyLights working but dimming isn't working. I > uploaded TeensyLights16_V2_dimmable_04.pde to it, but it still always > turns off at #EE. Any ideas for getting dimming to work?
> Oh, btw this is the bash command I use for sending stuff to the > Teensy, hopefully soon I'll have a full web interface for it that I'll > share later.
> sudo echo $'\x7E\x80\x01\xFF' > /dev/ttyACM0
> Just repeat \xFF for each channel and change /dev/ttyACM0 to the USB > serial interface to the Teensy. You can also add yourself to the > dialout group to write to the Teensy without root.
Unfortunately the triacs and the dimming depend on the zero crossing in the AC waveform to turn off. Triacs are a bit odd in that they latch on when the current passing through them exceeds a certain threshold. With AC, the voltage every 180 degrees through goes to 0v, thus the current goes to 0. This allows it to turn off.
However there might be some modifications we could make to the board to do that if you need. You could provide 12v AC in to the board and then rectify and filter (if needed) the output. This would only require that the resister between the opto-triac and the triac be changed. You would want to do this on bank 9-16. If you don't provide 120v AC to bank 1-8 then the zero crossing circuit will not work. The zero crossing circuit could be modified to work with 12v AC by changing the 2 resisters in that circuit.
> Unfortunately the triacs and the dimming depend on the zero crossing in
> the AC waveform to turn off. Triacs are a bit odd in that they latch on
> when the current passing through them exceeds a certain threshold. With AC,
> the voltage every 180 degrees through goes to 0v, thus the current goes to
> 0. This allows it to turn off.
> However there might be some modifications we could make to the board to do
> that if you need. You could provide 12v AC in to the board and then rectify
> and filter (if needed) the output. This would only require that the
> resister between the opto-triac and the triac be changed. You would want
> to do this on bank 9-16. If you don't provide 120v AC to bank 1-8 then the
> zero crossing circuit will not work. The zero crossing circuit could be
> modified to work with 12v AC by changing the 2 resisters in that circuit.
> --Bill
> On 8/15/2012 10:05 PM, Aaron VerDow wrote:
>> Oh, another question: can I use 12v dc on one half of it instead of 120v
>> ac?
I have a question about the programming... is there way to change the state of one channel without knowing the state of the other channels? For example, to change the second channel I have to pass a byte for the first channel and if I don't know it's state I can accidentally change it.
echo $'\x7E\x80\x01\xFF'
Is there a way to get the current values of each channel or is it possible to pass a padding byte to the controller? I noticed in the instructions 0x7D is a pad byte but didn't know if it could be used like this:
echo $'\x7E\x80\x7D\xFF'
Hopefully this should set channel 2 to FF and leave channel 1 alone. If not I might try to add another special byte to the firmware that does this.
On Wednesday, August 15, 2012 10:01:30 PM UTC-4, Aaron VerDow wrote:
> I got my TeensyLights working but dimming isn't working. I > uploaded TeensyLights16_V2_dimmable_04.pde to it, but it still always turns > off at #EE. Any ideas for getting dimming to work?
> Oh, btw this is the bash command I use for sending stuff to the Teensy, > hopefully soon I'll have a full web interface for it that I'll share later.
> sudo echo $'\x7E\x80\x01\xFF' > /dev/ttyACM0
> Just repeat \xFF for each channel and change /dev/ttyACM0 to the USB > serial interface to the Teensy. You can also add yourself to the dialout > group to write to the Teensy without root.
