hydroponic control

the following files are used

• hydro.service ; configuration file for the damon service, which start the main script
• main.py ; main script
• switches_gpio.py ; controls the GPIO Output to send den Signals

Quick test of service

send some signals to test basic function

- python3 rpi-rf_send.py -g 17 1377617
- python3 rpi-rf_send.py -g 17 1377620

check the damon status and the log of the service (/var/log/syslog)

systemctl status hydro.service

or check the damon configuration file 'hydro.service' is copied to the following destination

/etc/systemd/system/hydro.service

Using 433MHz Transmitter

I'm using the modules from https://www.az-delivery.de/products/433-mhz-modul to controll the irrigation of my hydroponic. It's a simple approach which works fine for me The modules are controlled via GPIO with the python modul https://pypi.org/project/rpi-rf/

Coding of the 433MHz signals

The signal consists of 5 digits for the group adress, 5 digits for the switch adress and 2 digits for the action to do. Every digit is expressed as 2bit, therefore it's a 24bit signal See also https://wiki.fhem.de/wiki/Intertechno_Code_Berechnung#Stellen_10-11_.28Ein.2FAus.29

Examples for different codes send for switch A:

- 00000 - 5588305 – 0101 0101 0100 0101 0101 0001
- 10000 - 1394001 – 0001 0101 0100 0101 0101 0001
- 01000 - 4539729 – 0100 0101 0100 0101 0101 0001
- 11000 – 345425  - 0000 0101 0100 0101 0101 0001
- 11111 – 1361    - 0000 0000 0000 0101 0101 0001

On/off examples for the group adress: 10001 and different switches:

- A: 1377617  - 1377620
- B: 1380689 - 1380692
- C: 1381457 - 1381460
- D: 1381649 – 1381652

here some examples decoded

- 1377617 - 0001 0101 0000 0101 0101 0001 = Group 10001 Switch A on
- 1377620 - 0001 0101 0000 0101 0101 0100 = Group 10001 Switch A off
- 1380689 - 0001 0101 0001 0001 0101 0001 = Group 10001 Switch B on
- 1380692 - 0001 0101 0001 0001 0101 0100 = Group 10001 Switch B off