greenmeephouse

Automating a greenhouse can involve various aspects such as controlling temperature, humidity, lighting, and irrigation systems. Below is an example of a Bash script that can be used to automate some basic greenhouse management tasks using a Raspberry Pi or similar device with sensors and actuators connected.

Prerequisites Hardware:

Raspberry Pi or similar device Temperature and humidity sensor (e.g., DHT22) Relay module for controlling devices (e.g., fans, lights, pumps) Optional: soil moisture sensor, light sensor Software:

Raspbian or similar Linux-based OS Python for interacting with sensors and actuators Bash for scripting automation tasks Python Scripts for Sensor Data Reading Temperature and Humidity Create a Python script to read data from a DHT22 sensor:

python Copy code

dht22_sensor.py

import Adafruit_DHT

Sensor should be set to Adafruit_DHT.DHT22

sensor = Adafruit_DHT.DHT22 pin = 4 # GPIO pin where the sensor is connected

humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)

if humidity is not None and temperature is not None: print(f'Temperature={temperature:0.1f}C Humidity={humidity:0.1f}%') else: print('Failed to get reading. Try again!') Controlling Relays Create a Python script to control a relay module:

python Copy code

relay_control.py

import RPi.GPIO as GPIO import sys

relay_pin = int(sys.argv[1]) state = sys.argv[2]

GPIO.setmode(GPIO.BCM) GPIO.setup(relay_pin, GPIO.OUT)

if state == 'on': GPIO.output(relay_pin, GPIO.LOW) # Assuming LOW turns the relay on elif state == 'off': GPIO.output(relay_pin, GPIO.HIGH) # Assuming HIGH turns the relay off

GPIO.cleanup() Bash Script for Automation Now, combine the Python scripts into a Bash script to automate tasks based on sensor data.

bash Copy code #!/bin/bash

Define GPIO pins for relays

FAN_RELAY=17 LIGHT_RELAY=27 PUMP_RELAY=22

Temperature and humidity thresholds

TEMP_THRESHOLD=30 # Celsius HUMIDITY_THRESHOLD=70 # Percent

Read sensor data

read_sensor_data() { data=$(python3 /path/to/dht22_sensor.py) temperature=$(echo "$data" | grep -oP 'Temperature=\K[0-9.]+') humidity=$(echo "$data" | grep -oP 'Humidity=\K[0-9.]+') echo "Temperature: $temperature°C, Humidity: $humidity%" }

Control relay

control_relay() { relay_pin=$1 state=$2 python3 /path/to/relay_control.py $relay_pin $state }

Automation logic

read_sensor_data

Control fan based on temperature

if (( $(echo "$temperature > $TEMP_THRESHOLD" | bc -l) )); then control_relay $FAN_RELAY "on" else control_relay $FAN_RELAY "off" fi

Control lights (example: turn on during the day and off at night)

hour=$(date +%H) if (( hour >= 6 && hour <= 18 )); then control_relay $LIGHT_RELAY "on" else control_relay $LIGHT_RELAY "off" fi

Control pump based on humidity (example logic)

if (( $(echo "$humidity < $HUMIDITY_THRESHOLD" | bc -l) )); then control_relay $PUMP_RELAY "on" else control_relay $PUMP_RELAY "off" fi Scheduling the Script Use cron to schedule the Bash script to run at regular intervals (e.g., every 5 minutes).

Open the crontab file:

bash Copy code crontab -e Add the following line to schedule the script:

bash Copy code */5 * * * * /path/to/your_script.sh This setup provides a basic framework for automating a greenhouse. You can expand it by adding more sensors and control logic as needed. Always ensure the hardware and software are securely set up to prevent any malfunction that could harm your plants or equipment.

otions in bash script ChatGPT In a Bash script, you can use command-line options to control the behavior of the script. This is commonly done using the getopts command, which provides a way to parse positional parameters and flags. Here is a basic example of a Bash script that uses options to control greenhouse automation tasks.

Example Script with Options The script will support options for:

Reading sensor data (-r or --read). Controlling the relay for a specific device (-c or --control). Setting thresholds for temperature and humidity (-t or --temp-threshold, -h or --humidity-threshold). Script: greenhouse_control.sh bash Copy code #!/bin/bash

Default values

TEMP_THRESHOLD=30 # Celsius HUMIDITY_THRESHOLD=70 # Percent

Define GPIO pins for relays

FAN_RELAY=17 LIGHT_RELAY=27 PUMP_RELAY=22

Function to read sensor data

read_sensor_data() { data=$(python3 /path/to/dht22_sensor.py) temperature=$(echo "$data" | grep -oP 'Temperature=\K[0-9.]+') humidity=$(echo "$data" | grep -oP 'Humidity=\K[0-9.]+') echo "Temperature: $temperature°C, Humidity: $humidity%" }

Function to control relay

control_relay() { relay_pin=$1 state=$2 python3 /path/to/relay_control.py $relay_pin $state }

Function to display usage

usage() { echo "Usage: $0 [-r | --read] [-c | --control DEVICE STATE] [-t | --temp-threshold TEMP] [-h | --humidity-threshold HUMIDITY]" echo " -r, --read Read sensor data" echo " -c, --control DEVICE STATE Control relay (DEVICE: fan, light, pump; STATE: on, off)" echo " -t, --temp-threshold TEMP Set temperature threshold" echo " -h, --humidity-threshold HUMIDITY Set humidity threshold" exit 1 }

Parse command-line options

while [[ "$#" -gt 0 ]]; do case $1 in -r|--read) read_sensor_data exit 0 ;; -c|--control) DEVICE=$2 STATE=$3 shift 2 case $DEVICE in fan) control_relay $FAN_RELAY $STATE ;; light) control_relay $LIGHT_RELAY $STATE ;; pump) control_relay $PUMP_RELAY $STATE ;; *) echo "Invalid device. Use fan, light, or pump." exit 1 ;; esac exit 0 ;; -t|--temp-threshold) TEMP_THRESHOLD=$2 shift ;; -h|--humidity-threshold) HUMIDITY_THRESHOLD=$2 shift ;; *) usage ;; esac shift done

Automation logic (this part runs only if no options are given)

read_sensor_data

Control fan based on temperature

if (( $(echo "$temperature > $TEMP_THRESHOLD" | bc -l) )); then control_relay $FAN_RELAY "on" else control_relay $FAN_RELAY "off" fi

Control lights (example: turn on during the day and off at night)

hour=$(date +%H) if (( hour >= 6 && hour <= 18 )); then control_relay $LIGHT_RELAY "on" else control_relay $LIGHT_RELAY "off" fi

Control pump based on humidity

if (( $(echo "$humidity < $HUMIDITY_THRESHOLD" | bc -l) )); then control_relay $PUMP_RELAY "on" else control_relay $PUMP_RELAY "off" fi How to Use This Script Read Sensor Data:

bash Copy code ./greenhouse_control.sh --read Control Relays:

Turn the fan on: bash Copy code ./greenhouse_control.sh --control fan on Turn the light off: bash Copy code ./greenhouse_control.sh --control light off Set Thresholds:

Set temperature threshold to 28°C: bash Copy code ./greenhouse_control.sh --temp-threshold 28 Set humidity threshold to 65%: bash Copy code ./greenhouse_control.sh --humidity-threshold 65 Scheduling the Script Use cron to schedule the script to run at regular intervals (e.g., every 5 minutes) without options, letting it control the environment based on the thresholds set.

Open the crontab file:

bash Copy code crontab -e Add the following line to schedule the script:

bash Copy code */5 * * * * /path/to/greenhouse_control.sh This setup allows you to automate greenhouse management tasks and adjust settings easily through command-line options.