I have used Arduino Nano, UNO and Mega to collect sensor based data like temperature, humidity, et cetera. and get it displayed on LED & LCD display.

But if i want to calculate a parameter from the sensor data and based on that calculated value, I want to control any valve or so, how can that be done???

First of all, what do you mean by " want to calculate a parameter from the sensor data" ?

for example if you want to control the valve based on temperature data, you are already able to receive that so just use simple if else structure and a threshold values to control. If you are worried about the controlling procedure, depending on the valve and situation you can use Relay or MOSFET switching.

C Eng Faruk Bin Poyen

First, Define the sensor_pin and Valve pin number as I/O in void setup

------------------------------------------------then In void loop()

sensor_ value = analogRead(sensor_pin) // Read from sensor 0 -1023

if( sensor_ value > 500) // check sensor_value is greater than 500 or less than 500

{

digitalWrite(Valve, HIGH); // if greater then Valve = ON

}else

{

digitalWrite(Valve, LOW); // if less then Valve = OFF

}

=====================

If you want to control an AC load then you have to use relay module for switching purpose.

Moin Uddin Atique let me put the question in a more elaborate form.

I have four inputs viz. temperature, humidity, wind speed, and solar radiation..

I am able to read the input data from sensors via the input ports.

I have a function for calculating Evaporation based on these four parameters.

I want to calculate the value of the evaporation using the formula within the arduino controller and display that calculated value..

How can I do that???

Secondly after I have calculated this evaporation value, i further intend to regulate one valve to control water flow on a specific site.

How can that be done too???

The formula calculation depends on the formula if it's a simple formula than just check the arduino math library, that should work. if it has complex form like integration or so on then you have to search internet to get resource for exact situation. Without the formula i can't say if it's possible or not but usually it is.

use a relay to control the evaporator or whatever. i