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LED Display - PowerPoint PPT Presentation


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LED Display. LED. Typical LED forward bias voltage: 1.5 to 2.0 V Typical currents needed to light LED range from 2 to 15 mA. Turning on a Diode (1). V2 =3.3 V V1=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).

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slide2
LED

Typical LED forward bias voltage: 1.5 to 2.0 V

Typical currents needed to light LED range from 2 to 15 mA.

turning on a diode 1
Turning on a Diode (1)

V2 =3.3 V

V1=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
Turning on a Diode (2)

V1 =0.0 V

V2=3.3 V, LED is on.

V1=0V, LED is off.

This method is used by the LED outputs on onBasys 2

erroneous result
Erroneous Result

(Not the right way to display “C”)

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