ospiLCD

This is OpenSprinkler pi I2C LCD python script which gets data from OpenSprinkler API and sends to I2C LCD.

features:

16x2 and 20x4 I2C LCDs are supported (PCF8574T based, after some changes MCP23008 is supported too)
first two lines are identical to LCD on OpenSprinkler 2.x (with icons)
third and fourth lines are displaying information based on ospi status (remaining watering time, water level in %, E1 stations status)
LCD backlight is controlled from OpenSprinkler GUI (Brightness = 0 ->> OFF, Brightness > 1 ->> ON)
LCD is refreshed in one minute interval (can be changed in cron)
this script in combination with Raspberry pi and I2C LCD can be used as remote OpenSprinkler LCD

Installation instructions

Install RPLCD library directly from PyPI using pip:

$ sudo pip install RPLCD

Intall smbus and i2c tools:

$ sudo apt-get install python-smbus i2c-tools

Intall ospiLCD script:

$ cd /home/pi/
$ wget  https://github.com/stanoba/ospiLCD/master/ospiLCD.py
$ chmod +x ospiLCD.py

Solder 2x3 pin header to ospi board:

Remove two 4K7 pull-up resistors from I2C LCD backpack:

Resistors are feeding 5V to Raspberry pi GPIO pins = not safe.

Connect I2C LCD to ospi pin header:

Run I2C scanner to detect all available address:

$ sudo i2cdetect -y 1

You should see I2C LCD at address 0x27:

Edit parameters (osAddress, osPort, md5hash, LCDcols, LCDrows) according your ospi and LCD in /home/pi/ospiLCD.py:

$ nano /home/pi/ospiLCD.py

Test the script if is working:

$ /home/pi/ospiLCD.py

If the script is working without error, schedule it via cron:

$ crontab -e

Add folowing line into cron:

*/1 * * * * python /home/pi/ospiLCD.py

Note: Script is executed every minute.

You can find LCD adapter PCB in HW folder.

PCB can be ordered from PCBs.io. ($0.89 / 4pcs)

Blue LCD 16x2:

Green LCD 20x4:

Green LCD 20x4 and ospi with expansion board (E1):