water_att

#! /bin/bash

#set variables
fillpump="P9_14"
drainpump="P9_16"
Trig1="/sys/class/gpio/gpio44"
Trig2="/sys/class/gpio/gpio26"
Trig3="/sys/class/gpio/gpio46"
Trig4="/sys/class/gpio/gpio65"
fill_relay="/sys/class/gpio/gpio67"
drain_relay="/sys/class/gpio/gpio68"
power_relay="/sys/class/gpio/gpio49"

#temperature sensor directory
echo BB-W1:00A0 > /sys/devices/bone_capemgr.9/slots

#set output for power relay for 5V supply line
if [ -f $power_relay/direction ]; then
	echo
else
	echo 49 > "/sys/class/gpio/export"
	echo "out" > $power_relay/direction
fi

sleep 0.01

#set the pins to read voltage
if [ `grep "cape-bone-iio" /sys/devices/bone_capemgr.*/slots | wc -l` -eq "1" ]; then
	echo 
else 
	echo cape-bone-iio > /sys/devices/bone_capemgr.*/slots
fi

sleep 0.01

#check if the trigger directories/files are set. if not, create them
if [ -f $Trig1/direction ]; then
	echo 
else
	echo 44 > "/sys/class/gpio/export"
	echo "in" > $Trig1/direction
fi

sleep 0.01

if [ -f $Trig2/direction ]; then
    echo
else
	echo 26 > "/sys/class/gpio/export"
	echo "in" > $Trig2/direction
fi

sleep 0.01

if [ -f $Trig3/direction ]; then
    echo
else 
	echo 46 > "/sys/class/gpio/export"
	echo "in" > $Trig3/direction
fi

sleep 0.01

if [ -f $Trig4/direction ]; then
    echo
else
	echo 65 > "/sys/class/gpio/export"
	echo "in" >  $Trig4/direction
fi

sleep 0.01

if [ -f $fill_relay/direction ]; then
    echo
else
        echo 67 > "/sys/class/gpio/export"
	echo "out" > $fill_relay/direction
fi

sleep 0.01

if [ -f $drain_relay/direction ]; then
    echo
else
	echo 68 > "/sys/class/gpio/export"
	echo "out" > $drain_relay/direction
fi

sleep 0.01

echo "Turning on 5V power supply..."
echo 1 > "$power_relay/value"

#Turn both pumps off
echo "Turning both pumps off..."
./servo $fillpump 0
./servo_angle $drainpump 0

#run trigger check
echo "Checking triggers..." 
trigger1=`cat "$Trig1/value"`
trigger2=`cat "$Trig2/value"`
trigger3=`cat "$Trig3/value"`
trigger4=`cat "$Trig4/value"`

#echo out the trigger values
echo "$trigger1" "$trigger2" "$trigger3" "$trigger4"

#check the level (if trig_1 is active) then fill pump if it is
echo "Checking trigger level 1..."
if [ "$trigger1" -eq "0" ]; then
	echo "Trigger 1 is not active..."
	echo "Filling water column..."
	./servo $fillpump 1
	echo 1 > "$fill_relay/value"
fi

#turn off fill pump when full
isfull="0"
while [ $isfull -eq "0" ]; do
	isfull=`cat "$Trig1/value"`
	sleep 0.01
done

#tube is full so stop the pump
echo "Stopping fill pump..."
./servo $fillpump 0
echo 0 > "$fill_relay/value"

#wait for 20 min
#sleep 20m
echo "Switching off power to triggers..."
echo 0 > "$power_relay/value"
echo "Waiting for water to settle..."
sleep 20m
echo "Turning power back on to triggers..."
echo 1 > "$power_relay/value"
sleep 1m

#start drain pump
echo "Starting drain pump..."
./servo_angle $drainpump 1
echo 1 > "$drain_relay/value"

#run attenuation measurement when trig_2 is deactive
isempty="1"
buffer1=2
buffer2=3
buffer3=4
while [ "$isempty" -eq "1" ]; do
        buffer1=`cat "$Trig2/value"`
	if [ $buffer1 == $buffer2 ] && [ $buffer2 == $buffer3 ]; then
		isempty=$buffer1
	else
		buffer3=$buffer2
		buffer2=$buffer1
	fi
        sleep 0.01
done

#take data until trig_3 is deactivated checked by the executable ./att_meas <filename>
helper_num=`./find_helper`
echo "Taking data..."
file_name="attnRun_"`date "+%Y_%m_%d_%H_%M"`".txt"
. attenuation_measurement $helper_num $file_name

#stop drain pump when trig_4 is deactive
fourisempty="1"
buffer1=2
buffer2=3
buffer3=4
while [ "$fourisempty" -eq "1" ]; do
        buffer1=`cat "$Trig4/value"`
	if [ $buffer1 == $buffer2 ] && [ $buffer2 == $buffer3 ]; then
		fourisempty=$buffer1
	else
		buffer3=$buffer2
		buffer2=$buffer1
	fi
        sleep 0.01
done

echo "Stopping drain pump..."
./servo_angle $drainpump 0
echo 0 > "$drain_relay/value"

echo "Turning off 5V power supply..."
echo 0 > "$power_relay/value"

echo "Water attenuation run status: COMPLETE"
#emergency turn off script