Maybe you read Part 1, maybe you skipped it 
Either way Part 2 is going to cover creating a new effect for Nagios. I wont say it’s the best bit of python programming I’ve done (Yes I copied and changed another effect as a starting point). The main thing I wanted was an alert status (yes Star Trek does come into it).
There’s 4 files to this effect:
- alert.py – The actual python program
- alert-green.json – etting a green colour (yes it’s spelt COLOUR not color!!!!!)
- alert-yellow.json
- alert-red.json
My hyperion is installed to ‘/opt/hyperion’ so first thing is to go to the effects directory
1 | cd /opt/hyperion/effects |
Then create the alert.py file
1 | nano alert.py |
Paste the following into it and save the file
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | import hyperionimport timeimport colorsysimport numpy as np# Get the rotation timecolorfrom = hyperion.args.get('colorfrom', (0,0,0))colorto = hyperion.args.get('colorto', (0,255,0))speed = float(hyperion.args.get('speed', 0.05))freq = float(hyperion.args.get('frequency', 2.5))step = float(hyperion.args.get('step', 30.0))ledCount = hyperion.ledCount# Setup the colorscolorfromnp = np.array(colorfrom)colortonp = np.array(colorto)#define the lerp calcdef lerp(a, b, t): x = a*(1 - t) + b*t x = np.around(x) x = x.tolist() return x# Start the write data loopwhile not hyperion.abort(): for i in range(0,int(step)): n = i / step thiscolor = lerp(colorfromnp, colortonp, n) colorLedsData = ledCount * bytearray((int(thiscolor[0]), int(thiscolor[1]), int(thiscolor[2]))) hyperion.setColor(colorLedsData) time.sleep(speed) time.sleep(speed*10) for i in range(1,int(step)): n = i / step thiscolor = lerp(colortonp, colorfromnp, n) colorLedsData = ledCount * bytearray((int(thiscolor[0]), int(thiscolor[1]), int(thiscolor[2]))) hyperion.setColor(colorLedsData) time.sleep(speed) colorLedsData = ledCount * bytearray(colorfrom) hyperion.setColor(colorLedsData) time.sleep(freq) |
I do use a numpy array, I can’t remember installing it but may have done. You can test if you have it installed
1 2 | pythonimport numpy as np |
Then we create the alert-green.json
1 | nano alert-green.json |
And Paste
1 2 3 4 5 6 7 8 9 10 11 12 | { "name" : "Green Alert", "script" : "alert.py", "args" : { "colorfrom" : [0,0,0], "colorto" : [0,255,0], "speed" : 0.05, "freq" : 2.5, "step" : 30.0 }} |
alert-yellow.json
1 2 3 4 5 6 7 8 9 10 11 12 | { "name" : "Yellow Alert", "script" : "alert.py", "args" : { "colorfrom" : [0,0,0], "colorto" : [255,255,0], "speed" : 0.05, "freq" : 2.5, "step" : 30.0 }} |
alert-red.json
1 2 3 4 5 6 7 8 9 10 11 12 | { "name" : "Red Alert", "script" : "alert.py", "args" : { "colorfrom" : [0,0,0], "colorto" : [255,0,0], "speed" : 0.05, "freq" : 2.5, "step" : 30.0 }} |
Finally restart hyperion to pickup the new effects
1 | service hyperion restart |
That’s it, you should now be able to run these effects. From the terminal:
1 | hyperion-remote -e "Red Alert" |
Should start the led’s glowing Red. If not I’d start with ‘hyperion-remote -l’ to check the effects are listed, then move on to working out what’s missing (see above about numpy array).
A few notes on this effect:
- Originally I programmed it forced to black, but it made sense to change this to a colorfrom value for future (if you want it green and fading to red for example).
- The speed is how quickly to progress through the fade.
- The step is how many colours it goes through to get from the colorfrom to the colorto
- Working out the speed and the step together are important for a nice fade (not jerky).
- The Freq in how long it stays on black before running the fade again.
This completes the hyperion side of the setup. I now have this effect installed and running on 3 PI’s and yes when there’s a problem they ALL go to yellow/red alert
2 thoughts on “Hyperion LED’s & Nagios (Part 2)”