LED Chaser | Electronic Project Circuits

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8 Channel PWM LED Chaser PIC 16F628A

This neat little circuit provides 8 LEDs directly driven from the PIC along with a single mode control switch. The firmware elsewhere on this page drives the LEDs with a 5 bit PWM signal providing each of the 8 LED channels with four levels of intensity; off, dim, mid, bright. A number of sequences are programmed into the firmware to provide some interesting visual effects and chase sequences, including the classic effect seen on the car in the Knight Rider TV series.
Read Source: http://picprojects.org.uk/projects/ledchaserpwm/index.htm

Be the first to comment - What do you think? Posted by admin - May 28, 2009 at 9:45 am

Categories: Microcontroller Tags: LED Chaser, led display sign, pwm driver

Running Lights by LM555 + 4017

The 555 Astable generates a clock for this circuit, an oscillator giving a square wave output at pin 3 which is counted by 4017 to give a running lights effect.
The decade counter-divider CD4017 has 10 outputs, for every low to high transition at the clock input, rising edge, the counter advances one LED. After going one full circle the the first LED lights again and it goes on. You can vary the value of R2 100K Linear potentiometer to make LEDs run fast or slow. The frequency of oscillation of astable 555 is given as f = 1.44 / ((R4 + 2 * (R2 + R3)) * C3)
The 10 outputs have 10 green LEDs. The current thru the LED is limited by R1, the current can be calculated like this (9V – 1.6V) / 1K = 7.4mA this is within 20mA which is the danger limit of the CMOS output. You want it to be bright use transistors for every output.

Buy light running circuit

The cap C1 is a filter and C2 is to prevent noise at pin 5 influencing the output as it is a control voltage point.
You can cascade or chain many more counters with the CO or carry out pin 12 of 4017. The pin 15 reset is kept at low for counting, on high it will reset the counter but is not used in this circuit.

Source:http://www.electronics-circuits.com/schematics/catDigital_Circuits.html

Be the first to comment - What do you think? Posted by admin - October 4, 2007 at 2:54 pm

Categories: Digital, LED Flasher, Lighting Tags: IC 4017, LED Chaser, led display, led running display

LED Chaser by IC 4017 + IC 555

I believes in that extremely amateur electronics many you, may ever build the LED flasher or light blinks or the LED Chaser prevent come to already. Today I begs for to advise the circuit LED Chaser, by have LED show 10 amounts together. blink stick bright chase go to continually. By have IC CD4017 circuits precede at drive a tube LED all. Which its work be Counter circuit good just this besides. Still have IC 555 wait for feed Clock with then can fine the speed of the winking with VR1 good easy. The detail is other see in circuit picture better.

Circuit LED Chaser by IC 4017 + IC 555