Programing an Uno to activate pint for relay if voltage is 11 volts

Projects Programming
1

Hi, i am new to all of this. I have a 0 to 25v senor
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How would i go about getting the uno to read voltage and activate a pin to activate a relay if voltage is over 11 volts? I can wire the relay to any pin and earth but reading other peoples codes cant understand enough to make alterations to work for me.

thanks

2

you connect the sensor to an analogue input (say A0) and read the value by calling analogRead(A0)
do you have a specification of the sensor?
also have a read of arduino realy tutorial

3

11V will be a reading of 450 from your analog input.

11 / (25/1024)

4

thanks