Light-emitting diode (LED) Interfacing with Microcontroller

Light-emitting diodes are elements for light signalization in electronics. They are manufactured in different shapes, colors and sizes. For their low price, low power consumption and simple use, they have almost completely pushed aside other light sources, bulbs at first place. They perform similar to common diodes with the difference that they emit light when current flows through them.

It is important to limit their current, otherwise they will be permanently destroyed. For this reason, a conductor must be connected in parallel to an LED. In order to determine value of this conductor, it is necessary to know diode’s voltage drop in forward direction, which depends on what material a diode is made from and what colour it is. Typical values of the most frequently used diodes are shown in table below. As seen, there are three main types of LEDs. Standard ones get ful brightness at current of 20mA. Low Current diodes get ful brightness at ten times lower current while Super Bright diodes produce more intensive light than Standard ones.

COLOR	TYPE	TYPICAL CURRENT ID (MA)	MAXIMAL CURRENT IF (MA)	VOLTAGE DROP UD (V)
Infrared	-	30	50	1.4
Red	Standard	20	30	1.7
Red	Super Bright	20	30	1.85
Red	Low Current	2	30	1.7
Orange	-	10	30	2.0
Green	Low Current	2	20	2.1
Yellow	-	20	30	2.1
Blue	-	20	30	4.5
White	-	25	35	4.4

Since the 8051 microcontroller can provide only low output current and since its pins are configured as outputs when voltage provided on them is 0V, direct connecting to LEDs is performed as shown in figure on the right (Low current LED, cathode is connected to the output pin).

Tags:
led interfacing with 8051
led interfacing with lpc2148
led interfacing with 8051 ppt
led interfacing with 8051 pdf
led interfacing with atmega16
led interfacing with 8085
led interfacing with 8051 program in assembly
led interfacing with pic
led interfacing with 8051 code
led interfacing with arduino
led interfacing with 8051
led interfacing with lpc2148
led interfacing with 8051 ppt
led interfacing with microcontroller
led interfacing with 8051 pdf
led interfacing with atmega16
led interfacing with 8085
led interfacing with 8051 program in assembly
led interfacing with pic
led interfacing with 8051 code
led array interfacing with 8051 microcontroller
led array interfacing
interfacing led at89c51
interfacing led and seven segment display
led interfacing with atmega16
led interfacing with atmega8
led interfacing with at89s52
led interfacing with arm7
led interfacing with atmega32
led interfacing with arduino
interfacing led and push button switch to 8051
lcd interfacing circuit
lcd interfacing commands

lcd interfacing code
lcd interfacing code for atmega16
lcd interfacing code in vhdl
lcd interfacing circuit diagram
lcd interfacing code in verilog
lcd interfacing conclusion
led interfacing circuit
lcd interfacing circuit design
c code for led interfacing with 8051
led interfacing diagram
led display interfacing with 8051
led display interfacing microcontroller
interfacing led display
led matrix display interfacing with 8051
7-segment led display interfacing with 8051
led dot matrix display interfacing with 8051
led interfacing engineersgarage
led interfacing in embedded system
led interfacing engineersgarage
hb led interfacing with microcontroller
hb led interfacing
led interfacing in 8051
led interfacing in embedded system
led interfacing program in c
led interfacing with 8051 in c
led interfacing with 8051 in assembly language
ir led interfacing with 8051
led interfacing with 8051 code in c
led interfacing with 8051 program in c
i/o interfacing led
lcd and keypad interfacing with 8051
led interfacing with lpc2148
led interfacing with lpc2148 pdf
led interfacing with lpc2138
led interfacing with lpc2129
led interfacing with lpc2294
led interfacing program with lpc2148
led interfacing with arm lpc2148
led interfacing microcontroller
led matrix interfacing with 8051
led matrix interfacing
led matrix interfacing microcontroller
led matrix interfacing with atmega16
led display interfacing microcontroller
led interfacing with microcontroller pdf
led interfacing with msp430
led interfacing with pic microcontroller
led interfacing with 8051 microcontroller program
led interfacing of 8051
interfacing of led with 8051 microcontroller pdf
interfacing of led with 8085
interfacing of led matrix with 8051
interfacing of led with 8051 microcontroller ppt
interfacing of led with lpc2148
interfacing of led with 8086
interfacing of led with 8085 microprocessor
interfacing of led with 89c51
interfacing of led with microprocessor
application of led interfacing
i/o interfacing led
led interfacing ppt
led interfacing program
led interfacing pdf
led interfacing program in c
led interfacing program with lpc2148
led interfacing with pic16f877a
led interfacing with pic microcontroller
led interfacing with parallel port
led interfacing using parallel port
led interfacing with p89v51rd2 microcontroller
led interfacing in embedded system
interfacing led and seven segment display
led interfacing to 8051
led interfacing techniques
interfacing led to lpc2148
led interfacing with 8051 theory
interfacing led using the parallel port
led interfacing with 8951 using timer with interrupt
led interfacing with 8051 microcontroller theory
led interfacing using 8255
led interfacing using 8051 microcontroller
led interfacing using parallel port
led interfacing using 8085
led interfacing with 8951 using timer with interrupt
led interfacing with 8051 video
led interfacing with 8051
led interfacing with lpc2148
led interfacing with 8051 ppt
led interfacing with microcontroller
led interfacing with 8051 pdf
led interfacing with atmega16
led interfacing with 8085
led interfacing with 8051 program in assembly
led interfacing with pic
led interfacing with 8051 code
led interfacing with atmega16
led interfacing with pic16f73
16 2 lcd interfacing with 8051
16*2 lcd interfacing with microcontroller
16*2 lcd interfacing with pic
16*2 lcd interfacing with atmega8
16x2 lcd interfacing with atmega16
16*2 lcd interfacing with arduino
16*2 lcd interfacing with at89s52
16*2 lcd interfacing with lpc2148
16*2 lcd interfacing with atmega32
16*2 lcd interfacing program
lcd interfacing 4 bit mode
16x2 lcd interfacing 4 bit mode
avr lcd interfacing 4 bit
4 bit lcd interfacing with lpc2148
4 bit lcd interfacing with atmega8
interfacing pic16f877a with lcd 4 8 bit
4 bit lcd interfacing with atmega32
interfacing 4-bit lcd to microcontroller
16 4 lcd interfacing
lcd interfacing using 4 bits
7 segment led interfacing with 8051
7 segment led interfacing
7 segment led interfacing with pic
7 segment led interfacing with 8085
7 segment led interfacing 8051 microcontroller
7-segment led display interfacing with 8051
arm7 interfacing with lcd
led interfacing 8051
led interfacing 8051 pdf
led interfacing 8086
led interfacing 8051 program
led interfacing with 8051 ppt
led interfacing with 8085
led interfacing with 8051 in c
led interfacing with 89c51
led interfacing with 8051 assembly code
led interfacing with 8051 code in c