strawberry-pi-greenhouse/README.md

strawberry-pi-greenhouse

Strawberry Pi Greenhouse is a little project that i made in my holidays. It's a software that sends sensor data (temperature, water level) to a Homeassistants instance and can receive commands from this HA instace to control a relay.

Hardware Installation

GPIO Pin Layout:

Pin	Kabel	Pin	Kabel
1		2	Ultraschall VCC
3	Temperatur SDA	4	LED VCC
5	Temperatur SCL	6
7		8
9	Relay GND	10
11		12
13		14
15		16
17	Temperatur VCC	18	Ultraschall Trig
19		20	Ultraschall GND
21		22	Ultraschall ECHO
23		24
25		26
27		28
29		30
31		32
33		34	Temperatur GND
35	Relay 1	36	Relay 2
37	Relay 3	38	Relay 4
39	Relay GND (for devices)	40

Software Installation

To activate the sensors you have to add these lines to you /boot/config.txt file on your raspberry pi micro sd card. You can change the pin numbers if you want.

dtparam=i2c1=on
dtparam=i2c_arm=on
enable_uart=0

#i2c Temperaturesensor
dtoverlay=i2c-gpio,bus=2,i2c_gpio_delay_us=1,i2c_gpio_sda=2,i2c_gpio_scl=3

Also you have to enable the i2c devices in the raspi-config menu. If you dont know how to do it you can just google it.

Now we need some packages that are needed to run the script. You can install them with this command:

sudo apt install python3-pip screen rpi.gpio -y

Now you can put the following command in a crontab to run the strawberry pi script in the background when the raspberry pi starts:

crontab -e
@reboot bash /path/to/repo/strawberry-pi-greenhouse/start.sh

You can also create a service/deamon or something like that if thats your thing instead of crontab.

The last thing you have to do befor you reboot is to enable i2c devices in the raspi-config.

1. execute this command sudo raspi-config
2. go to Interface Options
3. select I2C
4. select Yes

Now you can reboot your pi with sudo reboot