blink.sh

#!/bin/bash

BLINK_SPEED=.5
VALUE=$1
OPI=$(uname -a | grep sunxi)
OPI2=$(grep "Orange Pi Zero 2" /proc/device-tree/model)
RPI=$(grep -a "Raspberry" /proc/device-tree/model)

if [ "$RPI" ]; then
	echo none >/sys/class/leds/ACT/trigger
	echo none >/sys/class/leds/PWR/trigger
fi

red_on() {
	if [ "$OPI" ]; then
		echo 'default-on' >/sys/class/leds/orangepi\:red\:status/trigger
	elif [ "$OPI2" ]; then
		echo '255' >/sys/class/leds/orangepi\:red\:power/brightness
	elif [ "$RPI" ]; then
		echo 1 >/sys/class/leds/PWR/brightness
	fi
}
red_off() {
	if [ "$OPI" ]; then
		echo 'none' >/sys/class/leds/orangepi\:red\:status/trigger
	elif [ "$OPI2" ]; then
		echo '0' >/sys/class/leds/orangepi\:red\:power/brightness
	elif [ "$RPI" ]; then
		echo '0' >/sys/class/leds/PWR/brightness
	fi
}

green_on() {
	if [ "$OPI" ]; then
		echo 'default-on' >/sys/class/leds/orangepi\:green\:pwr/trigger
	elif [ "$OPI2" ]; then
		echo '255' >/sys/class/leds/orangepi\:green\:status/brightness
	elif [ "$RPI" ]; then
		echo 1 >/sys/class/leds/ACT/brightness
	fi
}

green_off() {
	if [ "$OPI" ]; then
		echo 'none' >/sys/class/leds/orangepi\:green\:pwr/trigger
	elif [ "$OPI2" ]; then
		echo '0' >/sys/class/leds/orangepi\:green\:status/brightness
	elif [ "$RPI" ]; then
		echo 0 >/sys/class/leds/ACT/brightness
	fi
}

echo "Blinking"
echo "$VALUE"

for ((repeat = 0; repeat < 5; repeat++)); do
	# Start sequence with fast blinking both
	for ((i = 0; i < 10; i++)); do
		FAST=$(echo "scale=2; $BLINK_SPEED/20" | bc)
		green_on
		red_on
		sleep "$FAST"
		green_off
		red_off
		sleep "$FAST"
	done
	sleep $BLINK_SPEED

	for ((i = 0; i < ${#VALUE}; i++)); do
		# Next character
		green_on
		sleep $BLINK_SPEED
		green_off
		sleep $BLINK_SPEED

		if [ "${VALUE:i:1}" == "." ]; then
			green_on
			red_on
			sleep $BLINK_SPEED
			green_off
			red_off
			sleep $BLINK_SPEED
		else
			if [ "${VALUE:i:1}" == "0" ]; then
				TWICE=$(echo "scale=2; $BLINK_SPEED*2" | bc)
				sleep "$TWICE"
			else
				# Convert hex to decimal number
				DEC_VAL=$(echo "obase=10; ibase=16; ${VALUE:i:1}" | bc)

				# Blink decimal number
				for ((j = 0; j < DEC_VAL; j++)); do
					red_on
					sleep $BLINK_SPEED
					red_off
					sleep $BLINK_SPEED
				done
			fi
		fi
	done
done

# Reset to defaults
green_on
red_off