please help me with the codes. the idea is i will control 3 parameters using each sensors and i need each single output from the sensors. thanks
Do you have data sheets for the devices. We can't even start to help you until we know more about your setup. There are many kinds of ultrasonic and flow sensors.
i have the US-100 ultrasonic and the YF-S201 water flow sensor
Can you draw/photograph a diagram of what your application is and how the inputs and outputs are connected.
Defining "multiple" might not be a bad idea either, not to mention being a little less secretive about the type of Arduino. Now that we actually know what one of the sensors is, you might note that the YF-s201 is a hall effect device and best used with external interrupt. A uno has two pins available for this, therefore "multiple" means "two". A Mega has six.
Oh no, then is it not possible to use three flow sensor? I would be using three
A Uno has two pins for interrupt but, as I said, a Mega has six.
Please do not cross-post as this wastes resources and everybodies time.