Till i find out how the wiring is done for the pressure switches i decided to make a little test about the response time of the system. What i want to find out now is, do that really works at my place with my parts and how much time my plant needs to drink the water from the switch and does it switches. If this is done I will water the plant by hand and i will see if the process will be reversed and the switch will go back in his OFF state.
The plant is a present from a friend of us and I have no idea what typ it is, but I very happy with it and sometimes when I’m out I give here a place next to the window to enjoy the day. I watered that plant in summer at here house and it is a very thirsty type. In a previous posting about the ceramic sensor i found out that the plant consumes about 15 ml in 24h. ( proberly, I didn’t measured they water amount , because i dont have that equipment ).
I filled the switch and the sensor with water , and it is imposible ( with my tubes etc… ) that you dont have air in the system, but i think that that will not be a problem. So i filled everything. The switch made click. It just takes a little amount of water, my tubes are very small, so i think the system is quite responsive.
I checked they continuity at my ports and they measuring gave me the values:
Filled = switch OFF = pin 21 + 23 = 000 / pin 21 + 22 = 1
so during the next 24 h they continuity should change if they plant drinks the water from the switch.( yummy )
What I forther did was to water the plant a little around the sensor. As you can see in the foto the water passed the earth and a little stayed in the groundplate. What I have seen then is that the earth absorbed that water during one hour into the system and that made the bubbles in the tube move down( 2 cm) . So it looks like that he system is really good responsive :). One point more , the switch is 40 cm under the flower pot, that is importend , because the system and the pressure relates to the difference in height from the sensor to the switch.