Tag Archives: diaply interfacing
Interfacing Static LED Display
Most of the microprocessor controlled instruments and machines need to display letters of the alphabet and numbers to give directions or data values to users. This information can be displayed using CRT , LED or LCD displays. CRT displays are used when a large amount of data is to be displayed. In systems where only a small amount of data is to be displayed.
Interfacing Static LED Display
Consider a circuit for driving single seven segment LED display. For common anode, when anode is connected to positve supply, a low voltage is applied to a cathode to turn it on. Here, BCD to seven segment decoder, IC 7447 is used to apply low voltages at cathodes according to BCD input applied to 7447. To limit the current through LED segments resistors are connected in series with the segments. This circuit connection is preferred to as a static display because current is being passed through the display at all times.
