m 2 led-fader: init
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27
makefu/2configs/deployment/led-fader/default.nix
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27
makefu/2configs/deployment/led-fader/default.nix
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{ config, lib, pkgs, ... }:
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with import <stockholm/lib>;
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let
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mq = "192.168.8.11";
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in {
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systemd.services.led-fader = {
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description = "Send led change to message queue";
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environment = {
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NIX_PATH = "/var/src";
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};
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wantedBy = [ "multi-user.target" ];
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path = with pkgs; [
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nix # nix-shell
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mosquitto #mosquitto_pub
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bash # nix-shell
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];
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serviceConfig = {
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# User = "nobody"; # need a user with permissions to run nix-shell
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ExecStart = pkgs.writeDash "run-fader" ''
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${./fade.py} --add-empty --mode chain 3 loop --skip-unchanged 0.002 0.1 \
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| mosquitto_pub -h ${mq} -p 1883 -l -t '/leds/nodemcu-switcher/set'
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'';
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PrivateTmp = true;
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};
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};
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}
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78
makefu/2configs/deployment/led-fader/fade.py
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78
makefu/2configs/deployment/led-fader/fade.py
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#! /usr/bin/env nix-shell
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#! nix-shell -i python3 -p python3 python35Packages.docopt
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""" usage: run [options] NUMLEDS (loop [--skip-unchanged] [STEP] [DELAY]|single STARTVAL)
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--add-empty essentially add a single empty led in front, does not count into NUMLEDS
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--mode=TYPE mode of fading (Default: chain)
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--output=TYPE output type, either json or raw (Default: json)
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--skip-unchanged if the value in the loop is unchanged, skip the output
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running with loop this script essentially becomes a generator which outputs the
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next value each "DELAY"
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single returns a single output with STARTVAL as starting point for the first led
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NUMLEDS is the number of leds to output data for (--add-empty does not count in here)
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STEP defaults to 0.01
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DELAY defaults to 1 second
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"""
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from docopt import docopt
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import time
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from colorsys import hsv_to_rgb
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import json
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import sys
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def calc_chain(numleds,val):
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divisor = 1.0 / numleds
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ret = []
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for i in range(numleds):
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v = float(divisor * i + val) % 1
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r,g,b = hsv_to_rgb(v,0.9,1)
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ret.append([int(r*255),
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int(g*255),
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int(b*255)])
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return ret
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def calc_single(numleds,val):
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ret = []
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for i in range(numleds):
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r,g,b = hsv_to_rgb(val,1,1)
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ret.append([int(r*255),
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int(g*255),
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int(b*255)])
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return ret
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def main():
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args = docopt(__doc__)
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numleds = int(args['NUMLEDS'])
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mode = args['--mode']
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step = float(args['STEP'] or 0.01)
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delay = float(args['DELAY'] or 1)
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val = float(args['STARTVAL'] or 0)
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last = []
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while True:
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if mode == "chain":
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ret = calc_chain(numleds,val)
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elif mode == "single":
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ret = calc_single(numleds,val)
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if args['--add-empty']:
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ret.insert(0,[0,0,0])
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# early serialization makes comparsion easy
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ret = json.dumps(ret)
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if not (args['--skip-unchanged'] and last == ret):
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last = ret
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print(ret)
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sys.stdout.flush()
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if args['single']:
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break
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else:
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val += step % 1
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time.sleep(delay)
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if __name__ == "__main__":
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main()
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