I am planning to do automation of hydroponics system . for that I am planning use Arduino mega . My question is that this board is comportable with arduino cloud services . I need your suggestion apart from the arduino mega do I have to by any other boards for cloud service . I seen In internet every where they used arduino nano IOT no one used arduino mega . I need your advices
The mega has the advantage of having lots of pins, which is handy if your hydroponics system is complex, but it has no built in hardware to connect to the internet, so without additional parts, it can't do IoT.
The arduino MEGA is not the right board for IOT.
If IOT is the main requirement then pick one of the supported board as the main controller and if you need more pins then either use IO port expanders or establish some sort of communication protocol with the MEGA (which is usually more complicated / fragile).
could you please give good suggestion for additional component for IOT support
ESP32 is popular for that kind of work.
I have more I/O ports my project is so big and I am using 10 different sensors 5 solenoid valves 5 motors (Relay unit). 1 stirrer. I am using only DC no AC with help of battery and solar need to run the system 24 hours . This my college project . please give some good advice regarding monitoring system
if In case I am using more sensors will it be problem. I mean I am using 10 sensors 5 motors , solenoid valves and LED DISPLAY , 5 motors
There are multiple ways to do it - @J-M-L gave you a couple in relay #3.
You may find that it's plausible to divide responsibility among several ESPs. They could communicate via MQTT, either local or cloud. I'd be inclined to have them talk to a Pi and then you can run a monitoring/controlling web site there but I suspect that you want an IoT cloud based dashboard so the various ESPs can transmit to that instead.