Where is the signal pin on the Fotek SSR-40?

Projects General Guidance
1

I wanted to use the Fotek SSR-40. I followed this tutorial to get a better understanding of how to control high voltage devices Turn Any Appliance into a Smart Device with an Arduino Controlled Power Outlet. Everything here makes sense, except that the water pump I need to control is a .30 amp 120 volt 20Watt pump. My understanding is that the 5Volt relay used in the guide is not going to be enough. I found another guide that shows how to use the Fotek SSR-40 How to use Fotek SSR-40 Solid State Relay with Arduino and without Arduino - YouTube. Looking at the following image: https://mounishkokkula.files.wordpress.com/2017/05/5v-relay-pinout1.png?w=1080

I do not see where the Signal Pin is located on the Fotek SSR-40. Can someone please explain how the both work exactly the same with the Arduino with two different setups?

2

A Fotek SSR-40 is a mains voltage AC SSR, and is not going to work with a 12volt pump.

"a 30 amp 12 volt 20Watt pump" does not make sense.
30x12= 360watt.
Post a link to the pump.
Leo..

3

My bad, I meant 120V pump. I do not have the link. I will be borrowing it from a friend to do test on. I figured for 120V pump the 5V relay in the guide was not sufficient.

4

omikolaj:
My bad, I meant 120V pump.

30x120= 3600watt. So what is it.
A 20watt pump is the size of a fist.
A wheelbarrow is needed for a 3600watt pump.

omikolaj:
I figured for 120V pump the 5V relay in the guide was not sufficient.

5volt is the voltage needed for the relay coil.
That 5volt can come from the Arduino.
The relay contacts that switch the pump have nothing to do with that.

A blue sugar-cube relay can be used for a 20watt pump, but not for a 3.6kW pump.
Same for the Fotek.

Beware of fake ones, so that 40A rating should be taken with a grain of salt.
The fake ones also seem to have trouble with 5volt logic from the Arduino.

An SSR can be controlled by an Arduino pin directly. +input to I/O pin, -input to Arduino ground.
Leo..

5

This is the pump https://www.amazon.com/EcoPlus-728310-Submersible-396GPH-Tubing/dp/B01HU300KY

I need to be able to turn it on and off depending on the soil moisture. So the smaller relay will definitely work. I thought it was going to be much bigger pump. Is it safer/better to use the Fotek or in this case it doesnt matter?

6

A finished product like this one could be a safer solution.
Leo..