hi I want to make an seat lifting mechanism using Arduino and want to use air pressure could you please give me idea how can i make it.
Like a real seat?
You are the one that is supposed to have ideas. We are here to help you realize your ideas...
What pressure do you expect? Why 12V DC?
Maybe a special type of pump? Like a compressor? Maybe a membrane pump?
You can't directly control 12V but you can use a relay or a MOSFET driver circuit to turn a motor or solenoid on or off.
The driver circuit can be used with PWM to control the speed of a DC motor.
Regular electro-mechanical relays also need a driver for the coil, but you can get a "relay board" with a driver built-in.
There are solid state relays that can be directly controlled by the Arduino. (But make sure to get one rated to switch DC. AC & DC solid state relays are generally not interchangeable.)
If you want to reverse a DC motor you'll need an H-driver (it's usually better to buy one than build it) or you can use two relays.
Are you sure you need an Arduino? Is the control logic complicated enough to need a "programmable brain"?
Post a block diagram of what you want and a statement of exactly what it is to do. Define what every thing is and how much force it will take. Is a seat part of a small valve, chair, etc?
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