LED Flasher | Electronic Project Circuits

Posts Tagged ‘LED Flasher’

Flashing LED with PIC12F629

This is the first example that you should to know how to set output pin. In this example, GPO is set as an output. LED1 will be turn-on when GP0 is set high and LED1 wiil be turn-off when GP0 is set low. This example use 4MHz internal clock.

http://electronics-diy.com/

Thank you.

Be the first to comment - What do you think? Posted by admin - May 27, 2008 at 11:40 am

Categories: LED Flasher, Lighting, Microcontroller Tags: led display, LED Flasher, pic-microcontroller

Two LED Flasher by Gate of IC 4011

IF you want the small circuit two LED Flasher, I show this circuit.
The important part of the circuit is IC 4011 again, I used gate of IC 4011 (see image).
IC wired as an astable multivibrator generating a 50% duty-cycle square wave at about 1Hz frequency.
Two LEDs are flasher to alternate.
To change value C1 and C2 for other flasher ratio.
Detail more, Please read in this image circuit.

Be the first to comment - What do you think? Posted by admin - April 22, 2008 at 2:12 pm

Categories: Digital, LED Flasher Tags: digital circuit, IC 4011, led display, LED Flasher

LED 12V Lead Acid Battery Meter with LM339

In the circuit below, a quad voltage comparator (LM339) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery. A 5 volt reference voltage is connected to each of the (+) inputs of the four comparators and the (-) inputs are connected to successive points along a voltage divider. The LEDs will illuminate when the voltage at the negative (-) input exceeds the reference voltage. Calibration can be done by adjusting the 2K potentiometer so that all four LEDs illuminate when the battery voltage is 12.7 volts, indicating full charge with no load on the battery. At 11.7 volts, the LEDs should be off indicating a dead battery. Each LED represents an approximate 25% change in charge condition or 300 millivolts, so that 3 LEDs indicate 75%, 2 LEDs indicate 50%, etc. The actual voltages will depend on temperature conditions and battery type, wet cell, gel cell etc.