Correcting RGB Color Value Scales for FLUX LED Strip plugin devices in Indigo – Python Scripting


I ran into a very frustrating problem last night while trying to work on some scripting within Indigo for controlling the LED colors of a new LED strip. I had no problem with actually controlling colors using the built-in UI tools for updating colors, but a slightly more complex usage presented a major problem.

The issue started with a need to save the current state of the individual RGB values in the LED strip, before I apply a change, such as when a notification occurs. This is to ensure that after a notification “flash” occurs that the colors will go back to the same values they were before the notification.

Via scripting, I had no problem getting the values. The problem occured when I went to restore the values. As it turns out, I struggled with this issue most of the night until I finally figured out that it was a difference between how the UI treats RGB values and how they are actually stored in the device.

The problem is that I was retrieving RGB values that were based on a scale with a minimum of 0 and a maximum of 255, but when I passed these values back the UI was converting those numbers, incorrectly, into values on a scale of 0 to 100. Eventually, I realized that before I can restore the individual color values, I must first convert them to the UI’s scale.

In addition, and perhaps I confused this with that issue, before I figured it out, I also had problems changing the color more than once in the same script. This may have been more of a timing issue (a kind of race condition) so I split the two scripts into seperate actions with a 5 second dely for the second script.

Here’s the first script that reads the LED strip’s color values and stores them into Indigo variables. The last line changes the RGB settings to display a yellow color, for notifications.

dev = indigo.devices[1681458792]
indigo.variable.updateValue(indigo.variables[770189775], value=unicode(int(dev.greenLevel)))
indigo.variable.updateValue(indigo.variables[753658911], value=unicode(int(dev.blueLevel)))
indigo.variable.updateValue(indigo.variables[1059165341], value=unicode(int(dev.brightness)))
indigo.dimmer.setColorLevels(dev, 100, 100, 0, 0)

The first ID used represents the Indigo ID for the LED strip. The other four IDs are for the Indigo variables. All of these devices are unique to my Indigo setup, my devices and my variables. The correct values can easily be acquired by right-clicking (or Control-click) on the item within Indigo to select the ‘Copy ID’ option.

The next part of the script restores the value of the individual color variables. It first converts each value to an integer (all Indigo variables are stored as strings, so they must be converted for this type of usage) and then do some simple math to convert the RGB values to the appropriate scale. The original equation I found had more components but I removed them since the minimum value in both scales is always zero; by removing the zeros it had no effect on the final calculation.

Note that RGB values being set should be integers as well, before being used to actually change the color values.

dev = indigo.devices[1681458792]
valRed = ((int(indigo.variables[872936515].value) * 100) / 255)
valGreen = ((int(indigo.variables[770189775].value) * 100) / 255)
valBlue = ((int(indigo.variables[753658911].value) * 100) / 255)
indigo.dimmer.setColorLevels(dev, int(valRed), int(valGreen), int(valBlue), 0)

So far, this seems to be working properly.

Nexlud LED Strips for TV Backlight and Home Automation (Magic Home)


LED Strip01.jpg

My desire to integration visual notifications into our home automation setup has remained, despite taking the color-changing LED bulb out of the setup when we moved. I recently begain toying with the same bulb and in the process I realized it might be fun, and useful, to find an LED strip that I could place behind the TV. It would add a nice atmospheric effect and also provide another source of visual indicators. I have started working on using the bulb for washing machine notifications and other events, but those notices are suppresed after 10 pm at night, and that light spends most of it’s time simply functioning as a normal lamp in the bedroom.

With any home automation setup it’s always best to ensure that a device is compatible with your controller, before purchase. Fortunately, someone had developed the FLUX LED plugin to make certain Magic Home devices available to Indigo. I decided to order a wifi and IR controlled Nexlud LED Strip Lights set, which only cost about $30.

It’s taken some work, and I had a color value conversion issue that I’ll mention in another post, but it appears to be working great. My next step is to set it to automatically turn on when the TV is powered on, and to turn it off when the TV is powered off. I’m not sure, yet, if I can accomplish this via Indigo. I test the Harmony Companion plugin, but I think it is only aware of Harmony interactions initiated within Indigo. I could be mistaken, which I’ll find out of for certain. If that doesn’t work, I’ll train the Harmony itself to interact with the device (Harmony didn’t automatically recognize this device in its database of codes).

Updated 2018/08/08: I also have it setup to be controlled via the Harmon Hub. This just required training the device to recognize the remote commands, which wasn’t difficult but did take some time to program most of the color modes. I also added control via Alexa, though now I only control the on/off state through the Hue Bridge emulation between Indigo and Alexa, instead of using the Magic Home skill.

LED Strip02.jpg