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| Circuit Diagram |
Led driving circuit using 5v supply
without any damage. If we connect directly the 5v supply to an LED, all the
source current flow through LED and it will burn out the LED. So we need a
resistor in series with LED. In electronics, load current always plays an
important role to design a circuit. Here the load current is the current
flowing through LED. So, the circuit need 20mA current to flow through the LED
for better brightness, therefore the load current is 20mA and LED takes only 2v
to ON.
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| Structure of a 8x7 LED |
To drive
the rows of the LED matrix, some microcontrollers doesn’t have enough output
voltage/currents. Therefore we need to place a transistor array or a latch
between the led matrix and microcontroller. Generally for simple LED Scrolling
board latch is enough to provide sufficient current to the LEDs. Here, we have
used 8-bit latch for this purpose. Each output of the 8-bit latch is able to
provide current greater than 20mA which is enough to produce sufficient
brightness to the LED.
VIDEO OF ANIMATION LED
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