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=== The Idea === | === The Idea === | ||
Since I'm too lazy<ref>...and I tend to forget...</ref> to water my tomatoes, I thought it would be nice if a [[Pi]] would take care of that. | Since I'm too lazy<ref>...and I tend to forget...</ref> to water my tomatoes<ref>And I'm planning to fly to Texas, so something has to tend to the tomatoes…</ref>, I thought it would be nice if a [[Pi]] would take care of that. | ||
=== How It Works === | === How It Works === | ||
A [[RaspberryPi]] is connected to a Sony Playstation Camera, a DHT11, some level switches, a relay and a | A [[RaspberryPi]] is connected to a Sony Playstation Camera, a [[DHT11]], some level switches, a relay and a solenoid valve.<br> | ||
[[Image:TomatOMatSchematics.png|800px]] | [[Image:TomatOMatSchematics.png|800px]]<br> | ||
==== Parts list ==== | |||
* [[RaspberryPi]] Rev 2 | |||
* Power supply for the [[Pi]] | |||
* Power supply for the pump/solenoid valve (12V, 2A) | |||
* Sony Playstation Camera | |||
* [[DHT11]] (side project [[RaspberryPi Humidity and Temperature Sensor]]) | |||
* [[DS18B20]] (side project [[RaspberryPi Temperature Sensor]]) | |||
* Lower watermark level switches like [http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=270774716317 this] (vertically mounted) | |||
* Upper watermark level switches like [http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=251231748848 this] (horizontally mounted) | |||
* <del>Pump (bought on eBay, model DC40A-1215 (12V, 350mA, 400l/h (6l/min), 1.5m delivery head, 30.000h lifetime) like [http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=350785299632 this])</del>, better yet<ref>Ookay, why should you use a valve instead of a pump? The valve will use more power and is more expensive...but it has one big advantage: It is closed when inactive. What? Oookay. I admit it: My reservoir is on a higher level than the flowerbed, as a result the water kept running after the pump stopped. That lead to a ''bit'' much water in the flowerbed. In short: IF your reservoir is on higher level -> use solenoid valve. IF your reservoir is lower than flowerbed -> use pump.</ref>: Solenoid valve like [http://www.magnetventile-shop.de/magnetventile-2/magnetventile-messing/magnetventil-direktgesteuert/elektro-magnetventil-g1/2-zoll-nc-direktgesteuert-v45.html this] | |||
* Relay board (5V, low-triggered, 2-channel, [http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&item=390517868081 this]) | |||
* some resistors, cables, wires, boards, and the usual soldering equipment | |||
=== | === Sources === | ||
==== <tt>00_check_and_init.sh</tt> ==== | |||
#!/bin/bash | |||
#set -x | |||
# File: 00_check_and_init.sh | |||
# Author: Heiko Kretschmer, watering-o-matic at 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 | |||
==== <tt>01_check_init.sh</tt> ==== | |||
#!/bin/bash | |||
#set -x | |||
# Author: tomatomat at wurst-wasser.net | |||
# Purpose: Checking wether GPIO pins are set up | |||
############# | |||
# Check GPIOs | |||
############# | |||
if [ ! -f "/sys/class/gpio/gpio8/value" ]; then | |||
echo "control file for gpio8 is missing, need to call 02_init.sh!" | |||
exit 1 | |||
fi | |||
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/gpio21/value" ]; then | |||
# echo "control file for gpio21 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/gpio23/value" ]; then | |||
echo "control file for gpio23 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 | |||
==== <tt>02_init.sh</tt> ==== | |||
#!/bin/bash | |||
#set -x | |||
# File: 02_init.sh | |||
# Author: tomatomat at 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 8 (Pin 24) - Input (k), reading signal upper water level measurement of reservoir | |||
# GPIO 17 (Pin 11) - Output (c), delivering signal for the pump / solenoid valve | |||
# GPIO 22 (Pin 15) - Input (e), reading signal for lower water level measurement of reservoir | |||
# GPIO 23 (Pin 16) - Input (h), reading signal for upper water level measurement of flowerbed | |||
# GPIO 24 (Pin 18) - Input (a), reading signal for lower water level measurement of flowerbed | |||
# GPIO 25 (Pin 22) - Input (g), reading signal for middle water level measurement of reservoir | |||
echo "Initializing GPIOs..." | |||
############# | |||
# Setup GPIOs | |||
############# | |||
# Set up GPIO 8 (Pin 24) and set to input (should read 0, if water over mark) | |||
NR="8" | |||
echo "${NR}" > /sys/class/gpio/export | |||
echo "in" > /sys/class/gpio/gpio${NR}/direction | |||
# 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 23 (Pin 16) and set to input (should read 0, if water over mark) | |||
NR="23" | |||
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/solenoid valve, since the relay triggers on low signal) | |||
echo "1" > /sys/class/gpio/gpio17/value # Pin 11 -> High, Pump/solenoid valve 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 | |||
==== <tt>04_check_uninit.sh</tt> ==== | |||
#!/bin/bash | |||
#set -x | |||
# Author: tomatomat at wurst-wasser.net | |||
# Purpose: Checking wether GPIO pins are set up | |||
############# | |||
# Check GPIOs | |||
############# | |||
if [ ! -f "/sys/class/gpio/gpio8/value" -a ! -f "/sys/class/gpio/gpio17/value" -a ! -f "/sys/class/gpio/gpio22/value" -a ! -f "/sys/class/gpio/gpio23/value" -a ! -f "/sys/class/gpio/gpio24/value" ! -f "/sys/class/gpio/gpio25/value" -a ]; then | |||
exit 0 # All GPIOs are gone | |||
fi | |||
exit 1 # One ore more GPIOs are still there | |||
# EOF | |||
==== <tt>09_uninit.sh</tt> ==== | |||
#!/bin/bash | |||
#set -x | |||
# File: 09_uninit.sh | |||
# Author: tomatomat at 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 | |||
"${GDIRBASE}/"04_check_uninit.sh && echo "We already did uninit. Exiting." && exit 1 | |||
# Check permissions (Actually, just export as root, then set permissions for device files, done) | |||
test "`whoami`" != "root" && echo "Must be root (or use sudo)." && exit 1 | |||
# Set output to default (disabling pump and putting safety on, since the relay triggers on low signal) | |||
echo "1" > /sys/class/gpio/gpio17/value # Pin 11 -> High | |||
# Clean up (Levels on GPIO output pins remain unchanged) | |||
echo "8" > /sys/class/gpio/unexport | |||
echo "17" > /sys/class/gpio/unexport | |||
echo "22" > /sys/class/gpio/unexport | |||
echo "23" > /sys/class/gpio/unexport | |||
echo "24" > /sys/class/gpio/unexport | |||
echo "25" > /sys/class/gpio/unexport | |||
# EOF | |||
==== <tt>10_check_level.sh</tt> ==== | |||
#!/bin/bash | |||
#set -x | |||
# File: 10_check_levels.sh | |||
# Author: Heiko Kretschmer, tomatomat at wurst-wasser.net | |||
# Purpose: Reading GPIO pins to get current water level | |||
# Globals | |||
GDIRBASE="/home/pi/Development/giess-o-mat" | |||
# Check if we already set up the GPIOs | |||
"${GDIRBASE}/"00_check_and_init.sh | |||
# Read from level-input (lower and upper water mark of reservoir) | |||
RESERVOIRUPPERWATERMARKVALUE="`cat /sys/class/gpio/gpio25/value`" | |||
RESERVOIRMIDDLEWATERMARKVALUE="`cat /sys/class/gpio/gpio8/value`" | |||
RESERVOIRLOWERWATERMARKVALUE="`cat /sys/class/gpio/gpio22/value`" | |||
# Read from level-input (lower water mark of flowerbed) | |||
FLOWERBEDLOWERWATERMARKVALUE="`cat /sys/class/gpio/gpio24/value`" | |||
FLOWERBEDUPPERWATERMARKVALUE="`cat /sys/class/gpio/gpio23/value`" | |||
# Say what's up! | |||
echo "" | |||
echo "Reservoir water level:" | |||
echo "----------------" | |||
echo "RESERVOIRUPPERWATERMARKVALUE: ${RESERVOIRUPPERWATERMARKVALUE} (0=water higher, 1=water lower than watermark)" | |||
echo "RESERVOIRMIDDLEWATERMARKVALUE: ${RESERVOIRMIDDLEWATERMARKVALUE} (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 "FLOWERBEDUPPERWATERMARKVALUE: ${FLOWERBEDUPPERWATERMARKVALUE} (0=water higher, 1=water lower than watermark)" | |||
echo "FLOWERBEDLOWERWATERMARKVALUE: ${FLOWERBEDLOWERWATERMARKVALUE} (0=water higher, 1=water lower than watermark)" | |||
echo "" | |||
# EOF | |||
==== <tt>16_pump_10s_if_necessary.sh</tt> ==== | |||
#!/bin/bash | |||
#set -x | |||
# Script: 16_pump_10s_if_necessary.sh | |||
# Author: tomatomat at wurst-wasser.net | |||
# Purpose: Set GPIO pins to start pump | |||
# Globals | |||
GFOLDERBASE="/home/pi/Development/giess-o-mat" | |||
GTIMESTAMPFORMAT="%H:%M:%S" | |||
#GTIMESTAMPFORMAT="%Y-%m-%d_%H:%M:%S" | |||
GTIMESTAMPDATE="`date +%Y-%m-%d`" # ISO8601 | |||
GFOLDERLOGS="${GFOLDERBASE}/logs" | |||
GLOGPUMP="${GFOLDERLOGS}/pump_${GTIMESTAMPDATE}.log" | |||
# Check if we already set up the GPIOs | |||
"${GFOLDERBASE}/"00_check_and_init.sh | |||
# Check permissions (Actually, just export as root, then set permissions for device files, done) | |||
#test "`whoami`" != "root" && echo "Must be root (or use sudo)." && exit 1 | |||
# Read levels | |||
FLOWERBEDLOWERWATERMARKVALUE="`\"${GFOLDERBASE}/\"11_read_FLOWERBEDLOWERWATERMARKVALUE.sh`" | |||
FLOWERBEDUPPERWATERMARKVALUE="`\"${GFOLDERBASE}/\"12_read_FLOWERBEDUPPERWATERMARKVALUE.sh`" | |||
RESERVOIRLOWERWATERMARKVALUE="`\"${GFOLDERBASE}/\"13_read_RESERVOIRLOWERWATERMARKVALUE.sh`" | |||
RESERVOIRMIDDLEWATERMARKVALUE="`\"${GFOLDERBASE}/\"14_read_RESERVOIRMIDDLEWATERMARKVALUE.sh`" | |||
RESERVOIRUPPERWATERMARKVALUE="`\"${GFOLDERBASE}/\"15_read_RESERVOIRUPPERWATERMARKVALUE.sh`" | |||
#echo "RESERVOIRLOWERWATERMARKVALUE: ${RESERVOIRLOWERWATERMARKVALUE}" | |||
# Check water level in reservoir, so we don't run dry! | |||
if [ "${RESERVOIRLOWERWATERMARKVALUE}" -eq 0 ]; then # 0=higher than mark, 1=lower than mark | |||
# Check water level in flowerbed, so we don't drown it (and the tomatoes start to rot) | |||
if [ "${FLOWERBEDUPPERWATERMARKVALUE}" -eq 1 ]; then # 0=higher than mark, 1=lower than mark | |||
# Check water level in flowerbed, so we don't drown it (and the tomatoes start to rot) | |||
if [ "${FLOWERBEDLOWERWATERMARKVALUE}" -eq 1 ]; then # 0=higher than mark, 1=lower than mark | |||
# Start pump | |||
echo "0" > /sys/class/gpio/gpio17/value # start pump | |||
# Log it so we can generate nice graphs afterwards | |||
GTIMESTAMP="`date +${GTIMESTAMPFORMAT}`" | |||
printf "${GTIMESTAMP}\t1\n" >> "${GLOGPUMP}" | |||
# Run for 10 Seconds | |||
sleep 10 | |||
# Stop Pump | |||
echo "1" > /sys/class/gpio/gpio17/value # stop pump | |||
# Log it so we can generate nice graphs afterwards | |||
GTIMESTAMP="`date +${GTIMESTAMPFORMAT}`" | |||
printf "${GTIMESTAMP}\t0\n" >> "${GLOGPUMP}" | |||
echo "`date '+%Y-%m-%d, %H:%M:%S'`: Pumped for 10 seconds (approx. 1l)" | |||
else | |||
echo "`date '+%Y-%m-%d, %H:%M:%S'`: Flowerbeds's lower watermark already reached, pump not started, we don't want to drown the tomatoes..." | |||
fi | |||
else | |||
echo "`date '+%Y-%m-%d, %H:%M:%S'`: Flowerbeds's upper watermark already reached, pump not started, we don't want to drown the tomatoes..." | |||
fi | |||
else | |||
echo "`date '+%Y-%m-%d, %H:%M:%S'`: Reservoir's lower watermark reached, pump not started." | |||
fi | |||
# Just for the logs, not necessary for this script | |||
FLOWERBEDLOWERWATERMARKVALUE="`\"${GFOLDERBASE}/\"11_read_FLOWERBEDLOWERWATERMARKVALUE.sh`" | |||
FLOWERBEDUPPERWATERMARKVALUE="`\"${GFOLDERBASE}/\"12_read_FLOWERBEDUPPERWATERMARKVALUE.sh`" | |||
RESERVOIRLOWERWATERMARKVALUE="`\"${GFOLDERBASE}/\"13_read_RESERVOIRLOWERWATERMARKVALUE.sh`" | |||
RESERVOIRMIDDLEWATERMARKVALUE="`\"${GFOLDERBASE}/\"14_read_RESERVOIRMIDDLEWATERMARKVALUE.sh`" | |||
RESERVOIRUPPERWATERMARKVALUE="`\"${GFOLDERBASE}/\"15_read_RESERVOIRUPPERWATERMARKVALUE.sh`" | |||
#EOF | |||
'''''MORE LATER''''' | |||
ToDo-List: | |||
* Scripts 11..15 | |||
* cronjobs | |||
=== 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<ref>Okay, if you need more exact timing, shell is not the environment of choice, but in this case it fits perfectly.</ref> | |||
===== GPIO protection ===== | |||
*Q: Why do you connect the GPIOs directly? You should use something like [http://www.heise.de/hardware-hacks/meldung/Raspberry-Pi-Erweiterung-Gertboard-wieder-verfuegbar-1789239.html GertBoard] to protect your [[Pi]]! | |||
*A: You are so right. I see this as a [[PoC]], next time I will do better, I promise. Next winter comes[TM]. | |||
---- | ---- | ||
* The live cam: http://www.wurst-wasser.net/tomatomat/ | * More... | ||
* How the temperature sensor works: [[RaspberryPi Temperature Sensor]] | ** The live cam: http://www.wurst-wasser.net/tomatomat/ | ||
* How the humidity and temperature sensor works: [[RaspberryPi Humidity and Temperature Sensor]] | ** How the temperature sensor works: [[RaspberryPi Temperature Sensor]] | ||
** How the humidity and temperature sensor works: [[RaspberryPi Humidity and Temperature Sensor]] | |||
* Footnotes: | * Footnotes: | ||
<references/> | <references/> | ||
* Tags: RaspberryPi, Raspberry Pi, RasPi, GPIO, Farm, Farming, Tomato, Tomatoes, Water, Flowerbed, Level, Water, Grow, Robot, Automatic, Automated, Valve, Lines, Fertilizer | |||
[[Category:Development]] | [[Category:Development]] | ||
[[Category:RaspberryPi]] | [[Category:RaspberryPi]] |
Latest revision as of 12:43, 18 December 2016
The Idea
Since I'm too lazy[1] to water my tomatoes[2], 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 solenoid valve.
Parts list
- RaspberryPi Rev 2
- Power supply for the Pi
- Power supply for the pump/solenoid valve (12V, 2A)
- Sony Playstation Camera
- DHT11 (side project RaspberryPi Humidity and Temperature Sensor)
- DS18B20 (side project RaspberryPi Temperature Sensor)
- Lower watermark level switches like this (vertically mounted)
- Upper watermark level switches like this (horizontally mounted)
Pump (bought on eBay, model DC40A-1215 (12V, 350mA, 400l/h (6l/min), 1.5m delivery head, 30.000h lifetime) like this), better yet[3]: Solenoid valve like this- Relay board (5V, low-triggered, 2-channel, this)
- some resistors, cables, wires, boards, and the usual soldering equipment
Sources
00_check_and_init.sh
#!/bin/bash #set -x # File: 00_check_and_init.sh # Author: Heiko Kretschmer, watering-o-matic at 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: tomatomat at wurst-wasser.net # Purpose: Checking wether GPIO pins are set up ############# # Check GPIOs ############# if [ ! -f "/sys/class/gpio/gpio8/value" ]; then echo "control file for gpio8 is missing, need to call 02_init.sh!" exit 1 fi 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/gpio21/value" ]; then # echo "control file for gpio21 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/gpio23/value" ]; then echo "control file for gpio23 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: tomatomat at 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 8 (Pin 24) - Input (k), reading signal upper water level measurement of reservoir # GPIO 17 (Pin 11) - Output (c), delivering signal for the pump / solenoid valve # GPIO 22 (Pin 15) - Input (e), reading signal for lower water level measurement of reservoir # GPIO 23 (Pin 16) - Input (h), reading signal for upper water level measurement of flowerbed # GPIO 24 (Pin 18) - Input (a), reading signal for lower water level measurement of flowerbed # GPIO 25 (Pin 22) - Input (g), reading signal for middle water level measurement of reservoir echo "Initializing GPIOs..." ############# # Setup GPIOs ############# # Set up GPIO 8 (Pin 24) and set to input (should read 0, if water over mark) NR="8" echo "${NR}" > /sys/class/gpio/export echo "in" > /sys/class/gpio/gpio${NR}/direction # Set up GPIO 17 (Pin 11) and set to output (Pump starts if 0) echo 17 > /sys/class/gpio/export echo "out" > /sys/class/gpio/gpio17/direction chown pi /sys/class/gpio/gpio17/value # Set up GPIO 25 (Pin 22) and set to input (should read 0, if water over mark) NR="25" echo "${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${NR}/direction # Set up GPIO 23 (Pin 16) and set to input (should read 0, if water over mark) NR="23" echo "${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${NR}/direction ############ # Init GPIOs ############ # Set output to default (disabling pump/solenoid valve, since the relay triggers on low signal) echo "1" > /sys/class/gpio/gpio17/value # Pin 11 -> High, Pump/solenoid valve disabled # Clean up #echo "17" > /sys/class/gpio/unexport #echo "21" > /sys/class/gpio/unexport #echo "22" > /sys/class/gpio/unexport #echo "23" > /sys/class/gpio/unexport #echo "24" > /sys/class/gpio/unexport # EOF
04_check_uninit.sh
#!/bin/bash #set -x # Author: tomatomat at wurst-wasser.net # Purpose: Checking wether GPIO pins are set up ############# # Check GPIOs ############# if [ ! -f "/sys/class/gpio/gpio8/value" -a ! -f "/sys/class/gpio/gpio17/value" -a ! -f "/sys/class/gpio/gpio22/value" -a ! -f "/sys/class/gpio/gpio23/value" -a ! -f "/sys/class/gpio/gpio24/value" ! -f "/sys/class/gpio/gpio25/value" -a ]; then exit 0 # All GPIOs are gone fi exit 1 # One ore more GPIOs are still there # EOF
09_uninit.sh
#!/bin/bash #set -x # File: 09_uninit.sh # Author: tomatomat at wurst-wasser.net # Purpose: Un-Initiating GPIO pins for in-/output # Important note: MUST be run as root! # Globals GDIRBASE="/home/pi/Development/giess-o-mat" # UnMain "${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 "8" > /sys/class/gpio/unexport echo "17" > /sys/class/gpio/unexport echo "22" > /sys/class/gpio/unexport echo "23" > /sys/class/gpio/unexport echo "24" > /sys/class/gpio/unexport echo "25" > /sys/class/gpio/unexport # EOF
10_check_level.sh
#!/bin/bash #set -x # File: 10_check_levels.sh # Author: Heiko Kretschmer, tomatomat at 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`" RESERVOIRMIDDLEWATERMARKVALUE="`cat /sys/class/gpio/gpio8/value`" RESERVOIRLOWERWATERMARKVALUE="`cat /sys/class/gpio/gpio22/value`" # Read from level-input (lower water mark of flowerbed) FLOWERBEDLOWERWATERMARKVALUE="`cat /sys/class/gpio/gpio24/value`" FLOWERBEDUPPERWATERMARKVALUE="`cat /sys/class/gpio/gpio23/value`" # Say what's up! echo "" echo "Reservoir water level:" echo "----------------" echo "RESERVOIRUPPERWATERMARKVALUE: ${RESERVOIRUPPERWATERMARKVALUE} (0=water higher, 1=water lower than watermark)" echo "RESERVOIRMIDDLEWATERMARKVALUE: ${RESERVOIRMIDDLEWATERMARKVALUE} (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 "FLOWERBEDUPPERWATERMARKVALUE: ${FLOWERBEDUPPERWATERMARKVALUE} (0=water higher, 1=water lower than watermark)" echo "FLOWERBEDLOWERWATERMARKVALUE: ${FLOWERBEDLOWERWATERMARKVALUE} (0=water higher, 1=water lower than watermark)" echo "" # EOF
16_pump_10s_if_necessary.sh
#!/bin/bash #set -x # Script: 16_pump_10s_if_necessary.sh # Author: tomatomat at wurst-wasser.net # Purpose: Set GPIO pins to start pump # Globals GFOLDERBASE="/home/pi/Development/giess-o-mat" GTIMESTAMPFORMAT="%H:%M:%S" #GTIMESTAMPFORMAT="%Y-%m-%d_%H:%M:%S" GTIMESTAMPDATE="`date +%Y-%m-%d`" # ISO8601 GFOLDERLOGS="${GFOLDERBASE}/logs" GLOGPUMP="${GFOLDERLOGS}/pump_${GTIMESTAMPDATE}.log" # Check if we already set up the GPIOs "${GFOLDERBASE}/"00_check_and_init.sh # Check permissions (Actually, just export as root, then set permissions for device files, done) #test "`whoami`" != "root" && echo "Must be root (or use sudo)." && exit 1 # Read levels FLOWERBEDLOWERWATERMARKVALUE="`\"${GFOLDERBASE}/\"11_read_FLOWERBEDLOWERWATERMARKVALUE.sh`" FLOWERBEDUPPERWATERMARKVALUE="`\"${GFOLDERBASE}/\"12_read_FLOWERBEDUPPERWATERMARKVALUE.sh`" RESERVOIRLOWERWATERMARKVALUE="`\"${GFOLDERBASE}/\"13_read_RESERVOIRLOWERWATERMARKVALUE.sh`" RESERVOIRMIDDLEWATERMARKVALUE="`\"${GFOLDERBASE}/\"14_read_RESERVOIRMIDDLEWATERMARKVALUE.sh`" RESERVOIRUPPERWATERMARKVALUE="`\"${GFOLDERBASE}/\"15_read_RESERVOIRUPPERWATERMARKVALUE.sh`" #echo "RESERVOIRLOWERWATERMARKVALUE: ${RESERVOIRLOWERWATERMARKVALUE}" # Check water level in reservoir, so we don't run dry! if [ "${RESERVOIRLOWERWATERMARKVALUE}" -eq 0 ]; then # 0=higher than mark, 1=lower than mark # Check water level in flowerbed, so we don't drown it (and the tomatoes start to rot) if [ "${FLOWERBEDUPPERWATERMARKVALUE}" -eq 1 ]; then # 0=higher than mark, 1=lower than mark # Check water level in flowerbed, so we don't drown it (and the tomatoes start to rot) if [ "${FLOWERBEDLOWERWATERMARKVALUE}" -eq 1 ]; then # 0=higher than mark, 1=lower than mark # Start pump echo "0" > /sys/class/gpio/gpio17/value # start pump # Log it so we can generate nice graphs afterwards GTIMESTAMP="`date +${GTIMESTAMPFORMAT}`" printf "${GTIMESTAMP}\t1\n" >> "${GLOGPUMP}" # Run for 10 Seconds sleep 10 # Stop Pump echo "1" > /sys/class/gpio/gpio17/value # stop pump # Log it so we can generate nice graphs afterwards GTIMESTAMP="`date +${GTIMESTAMPFORMAT}`" printf "${GTIMESTAMP}\t0\n" >> "${GLOGPUMP}" echo "`date '+%Y-%m-%d, %H:%M:%S'`: Pumped for 10 seconds (approx. 1l)" else echo "`date '+%Y-%m-%d, %H:%M:%S'`: Flowerbeds's lower watermark already reached, pump not started, we don't want to drown the tomatoes..." fi else echo "`date '+%Y-%m-%d, %H:%M:%S'`: Flowerbeds's upper watermark already reached, pump not started, we don't want to drown the tomatoes..." fi else echo "`date '+%Y-%m-%d, %H:%M:%S'`: Reservoir's lower watermark reached, pump not started." fi # Just for the logs, not necessary for this script FLOWERBEDLOWERWATERMARKVALUE="`\"${GFOLDERBASE}/\"11_read_FLOWERBEDLOWERWATERMARKVALUE.sh`" FLOWERBEDUPPERWATERMARKVALUE="`\"${GFOLDERBASE}/\"12_read_FLOWERBEDUPPERWATERMARKVALUE.sh`" RESERVOIRLOWERWATERMARKVALUE="`\"${GFOLDERBASE}/\"13_read_RESERVOIRLOWERWATERMARKVALUE.sh`" RESERVOIRMIDDLEWATERMARKVALUE="`\"${GFOLDERBASE}/\"14_read_RESERVOIRMIDDLEWATERMARKVALUE.sh`" RESERVOIRUPPERWATERMARKVALUE="`\"${GFOLDERBASE}/\"15_read_RESERVOIRUPPERWATERMARKVALUE.sh`" #EOF
MORE LATER ToDo-List:
- Scripts 11..15
- cronjobs
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[4]
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 a PoC, next time I will do better, I promise. Next winter comes[TM].
- More...
- 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:
- ↑ ...and I tend to forget...
- ↑ And I'm planning to fly to Texas, so something has to tend to the tomatoes…
- ↑ Ookay, why should you use a valve instead of a pump? The valve will use more power and is more expensive...but it has one big advantage: It is closed when inactive. What? Oookay. I admit it: My reservoir is on a higher level than the flowerbed, as a result the water kept running after the pump stopped. That lead to a bit much water in the flowerbed. In short: IF your reservoir is on higher level -> use solenoid valve. IF your reservoir is lower than flowerbed -> use pump.
- ↑ Okay, if you need more exact timing, shell is not the environment of choice, but in this case it fits perfectly.
- Tags: RaspberryPi, Raspberry Pi, RasPi, GPIO, Farm, Farming, Tomato, Tomatoes, Water, Flowerbed, Level, Water, Grow, Robot, Automatic, Automated, Valve, Lines, Fertilizer