I have been working on an IoT project at home. I have three different tanks with different volumes of water in them. I want to have the levels displayed on my dashboard using a Raspberry Pi. I need to automate the pump accordingly.
The only problem is that I can't run a wire three stories high to get the water level readings to my motor starter that is on the ground floor. So, I decided to use a NodeMUC with some ultrasonic sensors to continuously pass the data over WiFi to the Raspberry Pi and automate the motor accordingly. I am able to get the data (water level of each tank) and send it through my router to my dashboard.
My main concern is how to connect a NodeMCU to an SLA-05VDC-SL-C (which I believe will help me control the 1.5 hp motor starter board both manually and automatically) and to my 1.5 hp motor starter board (single-phase), and also the same with the 0.5 hp motor starter. (single-phase).
Maybe this edit will make it clear. I didn't know the names of the buttons. So, I want to know if it is possible to connect my NodeMCU and a Relay Module to control the DOL starter buttons that are already on my starter board (green for ON and red for OFF).
Here is an image of my already existing DOL buttons:
I am just confused about connecting these NO and NC circuits to a relay module. I know there is a NO and NC port in a relay, but here I am getting confused after seeing this complex(I feel so) circuitry of DOL buttons. If someone can possibly help me with this circuit. That would be great.
It would be very helpful if you could give me a circuit diagram for connecting each component to my starter board or any other way to automate the same using a NodeMCU and any type of relay.