Pretty new on Node Red, I want to make a water irrigation for my garden with 2 watervalves and 1 waterflow control for security. (later on some moisture sensors and so on)
First of all the 2 watervalves are planned to be activatet from 5 volt relays on a pi zero.
When node red starts it put my pin's state connectet to the relays low , which results in triggering the relays and opens the water flow(because the relays are low level triggered).
This results in a åben watervalve when reboot RaspOS or start node red service.
Very bad i my situation, water shall not flow just at starting node red.
I'm looking for a solution:
• Why is node red somehow take control over the pins state ?
• Is it possible to design the node red flow to put the pins high at start node red?
I I prefer not to change the relays or modify them with soldering because of possible more errors.
I want to learn more about the behavior of node red instead.
Pins connectet 11 and 36 state of both pins are:
1 AND IN when node red is not running
Pins connectet 11 and 36, state of both pins are:
0 and OUT when node red is running.I guess the flow is running as well.
I read the pins with "gpio readall" command
Pin numbers are physical pin numbers.
I will be grateful for some help here