Hello

I am using Buzzer part number PKMCS0909E4000-R1.

How to control the buzzer using micro-controller?

 

since it requires almost no current, just connect it to the output watch the polarity, + to output. it is a piezo electric speaker with an oscilator built in to make it sound.

 

There are two kinds of piezoelectric transducers/buzzers.

1) the transducer alone
2) the transducer with built-in oscillator, i.e. a buzzer.

You have just the transducer.
You will need to generate a 0-3V square wave at 4kHz.

Here is the data sheet:

http://www.mouser.com/ds/2/281/PKMCS0909E4000-R1-304946.pdf

 

why not just pulse the output? a little subroutine to pulse the output will sound the buzzer, change the rate to change the frequency .

 

What do you think about this circuit?

 

This circuit wont work because FDN340P is a P-MOS. And P-MOS will be always ON because Current will flow through PMOS body diode.

 

Sorry, It should be N FET , part number: IRLML2803

 

Too fancy and totally unnecessary.
You can connect the transducer directly to an output pin of the MCU with no harm.