Green Light Signal
Implements the UK National Grid "Green Light Signal".
Queries the API at https://carbonintensity.org.uk to find out the current carbon intensity for electricity generation in your area (denoted by your postcode).
Converts it into a colour, based on the colour-coding used on the carbonintensity site, representing very low (dark green), low (light green), moderate (yellow), high (amber), very high (red), and publishes it over MQTT to a #GlowOrb device that takes #rrggbb colour commands.
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