7 segment multiplexing

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This topic has 3 replies, 4 voices, and was last updated 11 years, 2 months ago by AJISH ALFRED.

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March 3, 2014 at 5:06 pm #2917

M Shuzub Gul
Participant

how to select a resistor to implement a 4 digit 7 segment COMMON ANODE led with 8051. what would be calculations for selecting resistor?

March 3, 2014 at 5:37 pm #11181

Ganesh Selvaraj
Participant

7 segment display is nothing but 7 LEDs arranged to form the display. So you just need a 330 Ohms resistor for each pin.

March 4, 2014 at 5:25 pm #11197

SHAH DISHANT H.
Participant

330 ohm or 470 ohm will be good enough.

March 5, 2014 at 4:30 am #11201

AJISH ALFRED
Participant

Hi,

Use this equation, R = V / I;

where V = supply voltage – 0.6

and you can choose ‘I’ as per the brightness you need. More the value of ‘I’, more brighter the display will be. Normally the value of ‘I’ should be around 10mA.
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