- This topic has 3 replies, 4 voices, and was last updated 9 years, 9 months ago by .
Viewing 4 posts - 1 through 4 (of 4 total)
Viewing 4 posts - 1 through 4 (of 4 total)
- You must be logged in to reply to this topic.
|
Microcontroller › 8051 › 7 segment multiplexing
how to select a resistor to implement a 4 digit 7 segment COMMON ANODE led with 8051. what would be calculations for selecting resistor?
7 segment display is nothing but 7 LEDs arranged to form the display. So you just need a 330 Ohms resistor for each pin.
330 ohm or 470 ohm will be good enough.
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.