2023-01-31 18:33:04 +01:00
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#!/bin/sh -e
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# Automatically set screen brightness based on time of day.
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# OLD: value=$(expr 100 - $(expr 13 - $(date +%H) | tr -d -) \* 5)
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# S Function: echo "(c($(date +%H) / 4 - 3) + 1) * 50" | bc -l
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2025-02-04 11:52:56 +01:00
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# summertime: value=$(echo "l=(100 - 1.5 * ( 11 - $(date +%H) ) ^ 2); if(l > 0) l else 3" | bc -l)
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value=$(echo "l=(100 - 3 * ( 12 - $(date +%H) ) ^ 2); if(l > 0) l else 3" | bc -l)
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if test "$1" != "-n"; then
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light -S $value
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inputmodule-control led-matrix --brightness $(echo $value / 5 + 2 | bc)
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if ! test -w /var/log/autolight
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then
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sudo chown :$(id -g) /var/log
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sudo chmod g+w /var/log
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fi
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fi
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printf "Set Light Level %4.1f at %s\n" "$value" "$(date)" | tee -a /var/log/autolight
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