How to control Relay board with Ardiuno !

Dear All,

Please anybody help me how can I control Relay board's power using Ardiuno board, like I want to decrease and increase the voltage !

Thanks in Advance

Relays are either ON or OFF. What do you mean by "I want to decrease and increase the voltage"?

A neat way to get resources on such things as "relay boards" is to simply Google it and add the suffix "shield". Companies like Adafruit, Sparkfun, and others are very good about giving you free access to the schematics and sample code!

Here is a Sparkfun Relay Shield https://www.sparkfun.com/products/11042

Ray

By increase and decrease I mean to fade in/out the lamp.......or I want to slow down the motor...etc

ibrahimsediq: By increase and decrease I mean to fade in/out the lamp.......or I want to slow down the motor...etc

That is not something you can do properly with mechanical relays.

ibrahimsediq: By increase and decrease I mean to fade in/out the lamp.......or I want to slow down the motor...etc

Then you need to research "H-Bridge", "Solid State Relay", PWM, etc