reef-pi :: An opensource reef tank controller based on Raspberry Pi.

[Simonv92]

Checked, no its not
So its UI problem and nothing you can do with that.

Thank you!
I don't know how to modify that in reef-pi software...
I'll do some more test with pwm -> analog -> pwm 16bit conversion..
It's not the best way but if we cannot modify the PCA9685 driver is the only solution..

 

[yury88]

Thank you!
I don't know how to modify that in reef-pi software...
I'll do some more test with pwm -> analog -> pwm 16bit conversion..
It's not the best way but if we cannot modify the PCA9685 driver is the only solution..

You have the option to fix reef-pi for your own use, though I am uncertain if the repository maintainers are still actively supporting the project.

Could you clarify how PWM-Analog-PWM might be beneficial for you?

The issue with reef-pi is that it offers 0–100% settings with a 1% increment. Whether using 12-bit or 16-bit, this 1% step will yield similar results. I suspect the developer of this module may not have used it themselves, as such a cumbersome UI suggests a lack of practical experience.

 

[Simonv92]

You have the option to fix reef-pi for your own use, though I am uncertain if the repository maintainers are still actively supporting the project.

Could you clarify how PWM-Analog-PWM might be beneficial for you?

The issue with reef-pi is that it offers 0–100% settings with a 1% increment. Whether using 12-bit or 16-bit, this 1% step will yield similar results. I suspect the developer of this module may not have used it themselves, as such a cumbersome UI suggests a lack of practical experience.

I also don't see any new update in the last month, we'll see.. I hope that the maintainers are still supporting the project..

Using a micro in the middle between reef-pi and the led driver I can force the pwm output to a lower level when a 1% signal is received on the input.. Not an elegant solution but I think It'll work.

Yes we have to unlock the 0 - 4096 value dimming (as done by @robsworld78 in his Robo-Tank app). But I don't know how and where to modify that... If you have any idea we can try...

Last solution will be using the original AirLink but it became very very hot and tech support says that is normal...

I feel a little frustrated right now, as I have done so many test, build my own pcbs for the controller and I miss this little step to finish everything..

​

 

[Simonv92]

@yury88 I've tested on version 6.0; If I enter 0,1% it'll keep the led very very dim
It works!! in the first % values light bounces a bit (tested form 0.1 to 5 to 0,1) but I can live with that..
Maybe @Ranjib in the future can smooth the dim curve..

 

[oreo54]

@yury88 I've tested on version 6.0; If I enter 0,1% it'll keep the led very very dim
It works!! in the first % values light bounces a bit (tested form 0.1 to 5 to 0,1) but I can live with that..
Maybe @Ranjib in the future can smooth the dim curve..

That could be your eyesight..
Linear dimming the low end can look abrupt because your eyes are more sensitive to "steps"
See gamma curve dimming..
Years ago I did suggest it as a "choice" linear or different gamma curves but do not believe it was implemented.

What are Dimming Curves and How to Choose - MOONS'

What are dimming curves and how to choose? MOONS’ LED drivers offer a variety of dimmer curve options that can be adapted to the dimmers and controllers from LUTRON, LEVITON, and HELVAR.

www.moonsindustries.com

LED Tricks: Gamma Correction

A fluke of human perception makes LEDs appear brighter than you’d expect, skewing RGB color mixes. Here’s a software trick to work around this and get the colors you want.

learn.adafruit.com

to "fix" it you'd use floating point math or a LUT..

 

[Simonv92]

That could be your eyesight..
Linear dimming the low end can look abrupt because your eyes are more sensitive to "steps"
See gamma curve dimming..
Years ago I did suggest it as a "choice" linear or different gamma curves but do not believe it was implemented.

What are Dimming Curves and How to Choose - MOONS'

What are dimming curves and how to choose? MOONS’ LED drivers offer a variety of dimmer curve options that can be adapted to the dimmers and controllers from LUTRON, LEVITON, and HELVAR.

www.moonsindustries.com

LED Tricks: Gamma Correction

A fluke of human perception makes LEDs appear brighter than you’d expect, skewing RGB color mixes. Here’s a software trick to work around this and get the colors you want.

learn.adafruit.com

I've read that the best curv for led dimming is not linear but kind of logarithmic.

https://lygte-info.dk/project/Demo16bitPWM UK.html

I think that reef-pi uses a linear dimming curv.
For now this is the best I could achieve, maybe in the future we can try to add this feature to reef-pi... these are the mod that I cannot do by myself.. unfortunately I'm an hardware guy, not a software one

P.S. does anyone of you know if I can set multiple mode for the same led channel? I want to run my blue channel both as Diurnal and as Lunar. There's a way to set it up or do I have to use the Interval mode at set each slider to the corresponding value?
thank you!

 

[Ranjib]

I've read that the best curv for led dimming is not linear but kind of logarithmic.

https://lygte-info.dk/project/Demo16bitPWM UK.html

I think that reef-pi uses a linear dimming curv.
For now this is the best I could achieve, maybe in the future we can try to add this feature to reef-pi... these are the mod that I cannot do by myself.. unfortunately I'm an hardware guy, not a software one

P.S. does anyone of you know if I can set multiple mode for the same led channel? I want to run my blue channel both as Diurnal and as Lunar. There's a way to set it up or do I have to use the Interval mode at set each slider to the corresponding value?
thank you!

reef-pi has a variety of pwm profiles that are not linear including sine and diurnal profiles https://github.com/reef-pi/reef-pi/blob/main/controller/pwm_profile/sine.go#L30

reef-pi/controller/pwm_profile/diurnal.go at main · reef-pi/reef-pi

An opensource reef tank controller based on Raspberry Pi - reef-pi/reef-pi

github.com

we can have a new profile to use some quadratic equation (read as curve) for interval based profiles (which is linear now), as long we have he mathematic formula and user appetite I don't see any reason to not have support that. If there's enough interest please create a GitHub issue and we can track it there

 

[Simonv92]

Thank you @Ranjib as always!! It is also possible to use two different profile at the same time on the same channel?
I mean, I have a blue channel on my lamp, and I want to use them on a Diurnal profile but also as Moonlight. There's a way to do that?

Do you also have a page where you show all the different lights mode and how do them work?
Thank you very very much!!
Simone

 

[Ranjib]

Thank you @Ranjib as always!! It is also possible to use two different profile at the same time on the same channel?
I mean, I have a blue channel on my lamp, and I want to use them on a Diurnal profile but also as Moonlight. There's a way to do that?

Do you also have a page where you show all the different lights mode and how do them work?
Thank you very very much!!
Simone

You should be able to use two different profile using two different light controller under the same module using the same jack/driver. You have to be careful about them not interefering with each other, by using timer to enable /disable them during night time vs day time.

I have not tested this, but I think it will work.

I don’t have a reference document showing each profile difference, but either in this thread or somewhere else I recall going over them during the release announcement. It will be nice to document those here

 

[Simonv92]

You should be able to use two different profile using two different light controller under the same module using the same jack/driver. You have to be careful about them not interefering with each other, by using timer to enable /disable them during night time vs day time.

I have not tested this, but I think it will work.

I don’t have a reference document showing each profile difference, but either in this thread or somewhere else I recall going over them during the release announcement. It will be nice to document those here

Thank you again!! I've tried to enable/disable the light using the timer but it doesn't work..
Timer seems to do nothing on lights... Maybe I'm doing something wrong

 

[BenB]

Thank you again!! I've tried to enable/disable the light using the timer but it doesn't work..
Timer seems to do nothing on lights... Maybe I'm doing something wrong

Hi Simon, for me it did work. Only I created 4 timers. One to turn on day and one to turn off day, one to turn on moonlight and one to turn of moonlight. Then I made one reversible macro to turn on day and turn off moonlight that I triggered only ones to initiate the start. Hope that helps....

 

[Simonv92]

Hi Simon, for me it did work. Only I created 4 timers. One to turn on day and one to turn off day, one to turn on moonlight and one to turn of moonlight. Then I made one reversible macro to turn on day and turn off moonlight that I triggered only ones to initiate the start. Hope that helps....

I'll do some test, thank you!!
Can you please share your timer and macro config? On my Controller Timer and Macro seems to do nothing on light...

 

[BenB]

I'll do some test, thank you!!
Can you please share your timer and macro config? On my Controller Timer and Macro seems to do nothing on light...

I will make a screenshot

 

[BenB]

I'll do some test, thank you!!
Can you please share your timer and macro config? On my Controller Timer and Macro seems to do nothing on light...

Here a screenshot of my timer, the macro I deleted, it was only one time needed...

 

[Simonv92]

Thank you!! So with the macro you "initiate" the system right? Because I've seen that the timer won't trigger the lights on or off by itself...

 

[BenB]

Thank you!! So with the macro you "initiate" the system right? Because I've seen that the timer won't trigger the lights on or off by itself...

Correct, or you have to wait until the moment the timers are set and kick in....

 

[Simonv92]

Here a screenshot of my timer, the macro I deleted, it was only one time needed...

@Ranjib There's no easy way to use the same channel both as Diurnal and Moonlight? Or maybe a simple way to control light enable/disable with timer without using macros..
Let me know if you have any idea.. Thank you!
Simone

 

[Simonv92]

Alright, I had a look at the code for the PWM-profiles on github and diurnal works with a cosine to the power of 3. The profile looks like this for different min/max settings:

The diurnal profile is at the minimum value outside the start and end times. In between the Start and End Time it ramps up and down.
At exactly the start time (denoted 0) it starts ramping up from the minimum, to the maximum. This takes about 1/5 or 20% of the time interval between Start and End. After about 1/10 or 10% of the interval the light is in the middle between minimum and maximum value ( in the plot: (80%+10%)/2 = 50% )
The same thing happends towards the end, at about 4/5 or 80% of the interval between start and end the light starts ramping down. It will have fallen half the way towards the minimum at about 9/10, or 90% of the interval between Start and End. At exactly the End time it will reach the minimum again.

Practical Example:
I set my light to Minimum 0% and Maximum 80%, since my light is a bit too strong, between 08:00 and 16:00.
It will slowly start up at exactly 08:00, reaching 80% shortly past 9:30 (20% of 8 hours are about 1 hour 30 minutes).
A few minutes before 14:30 it will start ramping down, reaching 0% exactly 16:00.

Something I saw as well, which @Ranjib mentioned in another thread:
there is a light profile called "composite", which seems to stitch together different light profiles for their respective programmable interval. In my case I could use this to, for example, have a diurnal between 08:00 and 16:00 and afterwards run a much weaker lunar profile between 16:00 and 08:00.
It's not exposed in the GUI yet, put I'm hopefull that I can either set this manually or wait for the update.

I've read on this thread about the "Composite" PWM Profile. It is usable? In this way we can solve all our complex to use the same channel during the day but also as moonlight...

I was also thinking about the possibility to add a button inside the Auto light menu to "Enable this channel as moonlight" and then set a value for the intensity (a fix value, without moon phase should be enough)

If tgere's interest I can open a feature request on GitHub.. Please let me know!