Tomat-O-Mat
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The Idea
Since I'm too lazy[1] to water my tomatoes, I thought it would be nice if a Pi would take care of that.
How It Works
A RaspberryPi is connected to a Sony Playstation Camera, a DHT11, some level switches, a relay and a pump.
Sources
00_check_and_init.sh
#!/bin/bash #set -x # File: 00_check_and_init.sh # Author: Heiko Kretschmer, watering-o-matic@wurst-wasser.net # Purpose: Checking wether the gpio are set up, and if not, setting 'em up. # Globals GDIRBASE="/home/pi/Development/giess-o-mat" # UnMain "${GDIRBASE}/"01_check_init.sh || sudo "${GDIRBASE}/"02_init.sh # EOF
01_check_init.sh
#!/bin/bash #set -x # Author: Heiko Kretschmer, watering-o-matic@wurst-wasser.net # Purpose: Checking wether GPIO pins are set up ############# # Check GPIOs ############# if [ ! -f "/sys/class/gpio/gpio17/value" ]; then echo "control file for gpio17 is missing, need to call 02_init.sh!" exit 1 fi if [ ! -f "/sys/class/gpio/gpio22/value" ]; then echo "control file for gpio22 is missing, need to call 02_init.sh!" exit 1 fi if [ ! -f "/sys/class/gpio/gpio24/value" ]; then echo "control file for gpio24 is missing, need to call 02_init.sh!" exit 1 fi if [ ! -f "/sys/class/gpio/gpio25/value" ]; then echo "control file for gpio25 is missing, need to call 02_init.sh!" exit 1 fi exit 0 # EOF
02_init.sh
#!/bin/bash #set -x # File: 02_init.sh # Author: Heiko Kretschmer, watering-o-matic@wurst-wasser.net # Purpose: Initiating GPIO pins for in-/output # Important note: MUST be run as root at boot-time - the "device"-files disappear on reboot! # GPIO numbers should be from this list # 0, 1, 4, 7, 8, 9, 10, 11, 14, 15, 17, 18, 21, 22, 23, 24, 25 # Note that the GPIO numbers that you program here refer to the pins # of the BCM2835 and *not* the numbers on the pin header. # So, if you want to activate Pin 07 on the header you should be # using GPIO4 in this script. Likewise if you want to activate Pin 11 # on the header you should be using GPIO17 here. # Check permissions (Actually, just export as root, then set permissions for device files, done) test "`whoami`" != "root" && echo "Must be root (or use sudo)." && exit 1 # The Pins we use, and how: (Details man gpio) # # GPIO 17 (Pin 11) - Output (c), delivering signal for the pump # GPIO 25 (Pin 22) - Input (g), reading signal for upper water level measurement of reservoir # GPIO 22 (Pin 15) - Input (e), reading signal for lower water level measurement of reservoir # GPIO 24 (Pin 18) - Input (a), reading signal for lower water level measurement of flowerbed echo "Initializing GPIOs..." ############# # Setup GPIOs ############# # Set up GPIO 17 (Pin 11) and set to output (Pump starts if 0) echo 17 > /sys/class/gpio/export echo "out" > /sys/class/gpio/gpio17/direction chown pi /sys/class/gpio/gpio17/value # Set up GPIO 25 (Pin 22) and set to input (should read 0, if water over mark) NR="25" echo "${NR}" > /sys/class/gpio/export echo "in" > /sys/class/gpio/gpio${NR}/direction # Set up GPIO 22 (Pin 15) and set to input (should read 0, if water over mark) NR="22" echo "${NR}" > /sys/class/gpio/export echo "in" > /sys/class/gpio/gpio${NR}/direction # Set up GPIO 24 (Pin 18) and set to input (should read 0, if water over mark) NR="24" echo "${NR}" > /sys/class/gpio/export echo "in" > /sys/class/gpio/gpio${NR}/direction ############ # Init GPIOs ############ # Set output to default (disabling pump and putting safety on, since the relay triggers on low signal) echo "1" > /sys/class/gpio/gpio17/value # Pin 11 -> High, Pump disabled # Clean up #echo "17" > /sys/class/gpio/unexport #echo "21" > /sys/class/gpio/unexport #echo "22" > /sys/class/gpio/unexport #echo "23" > /sys/class/gpio/unexport #echo "24" > /sys/class/gpio/unexport # EOF
04_check_uninit.sh
#!/bin/bash #set -x # Author: Heiko Kretschmer, watering-o-matic@wurst-wasser.net # Purpose: Checking wether GPIO pins are set up ############# # Check GPIOs ############# if [ ! -f "/sys/class/gpio/gpio17/value" -a ! -f "/sys/class/gpio/gpio25/value" -a ! -f "/sys/class/gpio/gpio22/value" -a ! -f "/sys/class/gpio/gpio24/value" ]; then exit 0 # All GPIOs are gone fi exit 1 # One ore more GPIOs are still there # EOF
09_uninit.sh
#!/bin/bash #set -x # File: 09_uninit.sh # Author: Heiko Kretschmer, watering-o-matic@wurst-wasser.net # Purpose: Un-Initiating GPIO pins for in-/output # Important note: MUST be run as root! # Globals GDIRBASE="/home/pi/Development/giess-o-mat" # UnMain "${GDIRBASE}/"04_check_uninit.sh && echo "We already did uninit. Exiting." && exit 1 # Check permissions (Actually, just export as root, then set permissions for device files, done) test "`whoami`" != "root" && echo "Must be root (or use sudo)." && exit 1 # Set output to default (disabling pump and putting safety on, since the relay triggers on low signal) echo "1" > /sys/class/gpio/gpio17/value # Pin 11 -> High # Clean up (Levels on GPIO output pins remain unchanged) echo "17" > /sys/class/gpio/unexport echo "25" > /sys/class/gpio/unexport echo "22" > /sys/class/gpio/unexport echo "24" > /sys/class/gpio/unexport # EOF
10_check_level.sh
#!/bin/bash #set -x # File: 10_check_level.sh # Author: Heiko Kretschmer, watering-o-matic@wurst-wasser.net # Purpose: Reading GPIO pins to get current water level # Globals GDIRBASE="/home/pi/Development/giess-o-mat" # Check if we already set up the GPIOs "${GDIRBASE}/"00_check_and_init.sh # Read from level-input (lower and upper water mark of reservoir) RESERVOIRUPPERWATERMARKVALUE="`cat /sys/class/gpio/gpio25/value`" RESERVOIRLOWERWATERMARKVALUE="`cat /sys/class/gpio/gpio22/value`" # Read from level-input (lower water mark of flowerbed) FLOWERBEDLOWERWATERMARKVALUE="`cat /sys/class/gpio/gpio24/value`" # Say what's up! echo "" echo "Reservoir water level:" echo "----------------" echo "RESERVOIRUPPERWATERMARKVALUE: ${RESERVOIRUPPERWATERMARKVALUE} (0=water higher, 1=water lower than watermark)" echo "RESERVOIRLOWERWATERMARKVALUE: ${RESERVOIRLOWERWATERMARKVALUE} (0=water higher, 1=water lower than watermark)" echo "" echo "Flowerbed water level:" echo "----------------------" echo "FLOWERBEDLOWERWATERMARKVALUE: ${FLOWERBEDLOWERWATERMARKVALUE} (0=water higher, 1=water lower than watermark)" echo "" # Reset pump echo "1" > /sys/class/gpio/gpio17/value # EOF
15_pump_10s.sh
#!/bin/bash #set -x # Script: 15_pump_10s.sh # Author: Heiko Kretschmer, watering-o-matic@wurst-wasser.net # Purpose: Set GPIO pins to start pump # Globals GDIRBASE="/home/pi/Development/giess-o-mat" # Check if we already set up the GPIOs "${GDIRBASE}/"00_check_and_init.sh # Check permissions (Actually, just export as root, then set permissions for device files, done) #test "`whoami`" != "root" && echo "Must be root (or use sudo)." && exit 1 # Start pump echo "0" > /sys/class/gpio/gpio17/value # start pump # Run for 10 Seconds sleep 10 # Stop Pump echo "1" > /sys/class/gpio/gpio17/value # stop pump
MORE LATER
Some thoughts
FAQ
Choice of programming language
- Q: Why don't you use python, C or any other higher language?
- A: I wanted to KISS. Shell is easy to code, easy to maintain, easy to learn, and easy to automate[2]
GPIO protection
- Q: Why do you connect the GPIOs directly? You should use something like GertBoard to protect your Pi!
- A: You are so right. I see this as PoC, next time I will do better, I promise. Next winter comes[TM].
- The live cam: http://www.wurst-wasser.net/tomatomat/
- How the temperature sensor works: RaspberryPi Temperature Sensor
- How the humidity and temperature sensor works: RaspberryPi Humidity and Temperature Sensor
- Footnotes: