LED Display

LED

Typical LED forward bias voltage: 1.5 to 2.0 VTypical currents needed to light LED range from 2 to 15 mA.

Turning on a Diode (1)

V2 =3.3 VV1=3.3 V, LED is off.V1=0V, LED is on.

This method is used by the 7-segment LED display on basys 2

Turning on a Diode (2)

V1 =0.0 VV2=3.3 V, LED is on.V1=0V, LED is off.

This method is used by the LED outputs on on Basys 2

A 7-Segment Display Containing Seven Light Emitting Diodes

Used by Basis2

Segment Values Required to display hex digits from 0 to F

Display Lower Case d

K-map for the segment e

Erroneous Result

(Not the right way to display “C”)

Error in Representing “b”

1

1

1

1

1(missing!)

One Way of Representing “b”

1

1

1

1

1(missing!)

1

Hex7seg_le.v

hex7seg_le_top

Decimal Point On

Showing Only 1 Digit