Discussion in 'The Projects Forum' started by vivek.raunak, Jan 19, 2011.
plz tell me how pin of 7 segment display is counted.
What's the part number?
The datasheet for the display shows the pins and their numbers.
The datasheet also tells you many more spec's that you should know.
Why don't you have the datasheet?
I think our OP is confused about where is pin 1 of the display is.
Sometimes the corner of the display is slightly flattened at pin 1. Sometimes there is a slight notch at one end.
Even if you don't have a datasheet available, you can usually figure out which pin does what pretty quickly by using the diode check function on a multimeter, or if you don't have one of those, by using a battery with a resistor and a couple of wires.
Assuming it's red, yellow or green, I'd recommend 3V and a 470 ohm resistor.