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hi guys,

         I am new to arduino. So pls help


         can i interface 7 segment display with arduino uno????
         if yes how and how many pins i need ????
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Sure - just need 7 pins, 1 for each display segment.  Make sure to use appropriate current limit resistor.
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thanks


but one more question

is there any way in which i can control a 7 segment display using a single pin?????
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As in, turn a knob for a potentiometer and have the reading change on the display?  Sure, easy enough.

Control 7 LEDs from 1 pin?  No.
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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it need not be 7 segment display


i have around 3 to 4 pins free on my board
i have to interface a display which has two numbers(00-99)

is there any way????
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Sure.

IO expanders, shift registers, etc.
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thanks dhenry

but can u explain some more
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Connect your LED displays to a shift register. The shift register needs fewer pins to control, generally 3: the datapin, the clockpin, and a latch pin, connected thusly.
In this example, MOSI is the serial data that gets shifted in, SCK is the clock line that stores each bit, and SS is the latch signal that moves the data to the output register.


* Shift-MOSFET_LED_strips.jpg (52.68 KB, 960x720 - viewed 14 times.)
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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