Temp room control with raspberry pi

#!/bin/bash

# by: kk003
# Rig name: Your rig's name here (if you want)

# What's this about?:
# This script is for rigs that have a raspberry pi (type 3 in my case) "attached" whith:
# 1. Temp sensor type DS18B20
# 2. Ability to hard reset the rig from rasberry pi
# 3. Ability to hard poweroff/poweron the rig from rasberry pi
# 4. Rasberry pi running ubuntu-mate-16.04.2-desktop-armhf-raspberry-pi

# Hardware notes:
# Main the relay SRD-05VDC-SL-C beheivor is different than others
# Read "The reset bit" and "The poweroff bit" down the code for more info

# Helpfull documentation:
# http://bernaerts.dyndns.org/linux/75-debian/351-debian-send-telegram-notification
# https://www.ibm.com/developerworks/community/blogs/aixpert/entry/Computer_Room_Temperature_Monitoring_with_a_Raspberry_Pi?lang=en
# https://bitcointalk.org/index.php?topic=1854250.msg22615430#msg22615430

# Name script: check_health_system.sh
# Poweroff the rig if room temperature too high

# If room temperature threshold is reached the script hard reset and hard poweroff the rig. Then it gets in to a loop state
# which keeps it running "forever" until you manualy kill it (kill -9 number_id_check_health_system.sh)
# You can get the id of this running script like this: ps aux | grep -v grep | grep check_health_system.sh
# You will see two lines with the script name. Kill both using the numbres in the second column once you resolve the temp problem
# Otherwise if (if not in loop) temperature does not drop at next check the rig will be turn on (keep in main that power switch meets both functions, on and off)

# Installation:
# Login as root or su -l from your user
# Save the script in root dir and give execution rights like this
# chmod 700 /root/check_health_system.sh
# Run the script from cron every 2 minutes (or whatever yopu want) like this
# */2 * * * * /root/check_health_system.sh >> /root/temp_ambiente.log
# log file's name: /root/temp_ambiente.log


# Some vars
RIG_NAME="your rig's name here"          # I don't use it
IP_RIG="your rig's IP here"               # The ip of the rig "attached" to your raspberry pi goes here and must be possible to ping it from the raspi
TEMP_THRESHOLD=47       # MUST be a INTEGER and is the max room temperature you permit. DON'T set it too low or the rig will be powered off
THRESHOLD_REACHED=0     # 0=threshold NOT reached, 1=threshold reached ALERT!!!!. WARNING: If you set this here to 1 your rig will be turn off
LF=$'\n'                # New line
NOMBRES_DIR="/root/nombres"

# Telegram vars
CHATID="your telegram chat id here"             # Your telegram chat id here
APIKEY="your telegram apikey here"              # Your telegram api key here
TELEGRAM_TEMP_LOG_FILE="/root/telegram_temp_warning.log"
SEND_TELEGRAM=1                                 # 1=send telegram, 0=Don't send telegram

START_TIME=`date "+%Y-%m-%d %H:%M:%S"`
echo "Start time: " $START_TIME

# Me aseguro de que el script no se esta ejecutando. Solo quiero una instancia del script a la vez.
# Si ya se esta ejecutando salgo sin mas
if pidof -x $(basename $0); then
    for p in $(pidof -x $(basename $0)); do
        if [ $p -ne $$ ]; then
           echo "$0 Already running. Exiting..."
            echo
            exit
        fi
    done
fi

# Clear the file's content if exists and is not empty
if [[ -s $TELEGRAM_TEMP_LOG_FILE ]]; then
    > $TELEGRAM_TEMP_LOG_FILE
fi

# Get the raspi's hostname
SYSTEM_PI=$(hostname)

ls /sys/bus/w1/devices/ | grep 28* > $NOMBRES_DIR
N=$(cat $NOMBRES_DIR | wc -l)
echo "Number of sensors : " $N | tee -a $TELEGRAM_TEMP_LOG_FILE

for ((LINEAS=1; LINEAS <= $N ; LINEAS=LINEAS+1))
do
    NOMBRE_FILE=`sed -n -e "${LINEAS}p" $NOMBRES_DIR`
    STRING_TEMP=$(cat /sys/bus/w1/devices/$NOMBRE_FILE/w1_slave | grep t= | cut -d"=" -f2)
    TEMP=$(echo "scale=2; $STRING_TEMP/1000" | bc)
    TEMP_INTEGER=$(echo $TEMP | cut -d. -f1)

    echo -n "Sensor$LINEAS : $NOMBRE_FILE - Temp " | tee -a $TELEGRAM_TEMP_LOG_FILE
    if [[ $TEMP_INTEGER -ge $TEMP_THRESHOLD ]]; then
        echo -n $TEMP | tee -a $TELEGRAM_TEMP_LOG_FILE
        echo -n "ºC" | tee -a $TELEGRAM_TEMP_LOG_FILE
        echo -n " ----> threshold : $TEMP_THRESHOLD" | tee -a $TELEGRAM_TEMP_LOG_FILE
        echo "ºC" | tee -a $TELEGRAM_TEMP_LOG_FILE
        THRESHOLD_REACHED=1 # 1= reached temp limit ALERT!!!!!!
    else
        echo -n $TEMP | tee -a $TELEGRAM_TEMP_LOG_FILE
        echo "ºC" | tee -a $TELEGRAM_TEMP_LOG_FILE
    fi
done


if [[ $THRESHOLD_REACHED -eq 1 ]]; then # 1=reached threshold temp, 0=we are under threshold limit

		if [[ SEND_TELEGRAM -eq 1 ]]; then
    # Send a telegram warning first
    PUBLIC_IP=$(curl -s checkip.dyndns.org | sed -e 's/.*Current IP Address: //' -e 's/<.*$//')
    WARNING="WARNING from $SYSTEM_PI $LF Warning: room temperature limit reached ($TEMP_THRESHOLD ºC) $LF Ip Raspi: $PUBLIC_IP $LF Attempting to turn off the rig.$LF"
    CONTENT=$(cat $TELEGRAM_TEMP_LOG_FILE)
    MSG="$WARNING$CONTENT"

    curl -s -X POST --output /dev/null https://api.telegram.org/bot${APIKEY}/sendMessage -d "text=${MSG}" -d chat_id=${CHATID}
    CODE_CURL=$?

    # Check if the mgs went out ok
    if [[ $CODE_CURL -eq 0 ]]; then
        echo "Msg send ok!!"
    else
        echo "Got a non zero exit code from curl : $CODE_CURL . The message probably has not reached its destination"
    fi
    fi

		#####
		#    Doing a reset and then a poweroff did not work for me, so de reset bit is commented
		#####
    # I do a hard reset first and then a hard poweroff directly. Don't risk to try a soft poweroff or whatever via software
    # Reset the rig using relay's channel 2
    # It does not work the same with all relays
    # With SONGLE SRD-05VDC-SL-C setting "0" in gpio shorts the reset and "1" frees the circuit
    # So you must check this before you put it into production
    #
    # The reset bit
#    echo "Reseting the rig..."
#    GPIO_RESET=23
#    gpio -g mode $GPIO_RESET out
#    sleep 1
    # Reset the rig
#    gpio -g write $GPIO_RESET 0
#    sleep 1 # Keep the short circuit for 1 seg
#    gpio -g write $GPIO_RESET 1

#    sleep 1

    # Poweroff the rig using relay's channel 1
    # It does not work the same with all relays
    # With SONGLE SRD-05VDC-SL-C setting "0" in gpio shorts the poweroff and "1" frees the circuit.
    # So you must check this before you put it into production
    #
    # The poweroff bit
    echo "Powering off the rig..."
    GPIO_POWER=24
    gpio -g mode $GPIO_POWER out
    sleep 2
    # Poweroff the rig according to the previous state (assume it is powered on)
    gpio -g write $GPIO_POWER 0
    sleep 1 # Keep the short circuit for 1 seg
    gpio -g write $GPIO_POWER 1


    #######
    #       **** VERY IMPORTANT
    #######
    #
    # I keep the script in a infinite loop at this point because if the temp does not drop
    # the poweroff bit will startup the rig again, so this script will need a manual kill
    # and cron will automatically run it again
    #
    sleep 120 # I stop here for 2 minutes before enter the loop
    TELEGRAM_PING_WARNING=0 #0=I did not send a telegram warning notifying the rig is responding to ping (it should't), 1=The warning has been sent
    while true # It's allways true!!!
    do
        # For testing I do a ping just to make sure the rig is offline and I can see it in log file later
        ping -n -c 3 -i 2 -W 3 $IP_RIG
        if [[ $? -eq 0 ]]; then
            echo "WARNING: Rig $RIG_NAME is responding to ping. It should't. The rig's state should be poweroff"

            if [[ $TELEGRAM_PING_WARNING -eq 0 ]]; then # I telegram the warning only once

								if [[ SEND_TELEGRAM -eq 1 ]]; then
                WARNING="WARNING from $SYSTEM_PI $LF WARNING: room temperature limit reached ($TEMP_THRESHOLD ºC). $LF The rig responds to ping and should not. $LF The rig's
state should be poweroff. $LF This is the last warning."
                MSG="$WARNING"

                curl -s -X POST --output /dev/null https://api.telegram.org/bot${APIKEY}/sendMessage -d "text=${MSG}" -d chat_id=${CHATID}
                CODE_CURL=$?

                # Check if the mgs went out ok
                if [[ $CODE_CURL -eq 0 ]]; then
                    echo "Msg send ok!!"
                    TELEGRAM_PING_WARNING=1
                else
                    echo "Got a non zero exit code from curl : $CODE_CURL . The message probably has not reached its destination"
                fi
            fi
                fi
        else
            echo "OK: rig $RIG_NAME is NOT responding to ping. Its current state should be poweroff"
        fi

        CURRENT_TIME=`date "+%Y-%m-%d %H:%M:%S"`
        echo "Current time: " $CURRENT_TIME
        echo "*"
        sleep 120 # 2 minutes delay until the loop starts again

    done



else

    echo -n "Ok, temp is under threshold limit ($TEMP_THRESHOLD"
    echo "ºC)"
fi

END_TIME=`date "+%Y-%m-%d %H:%M:%S"`
echo "End time: " $END_TIME
echo "****"
echo