Technology
Blinking eyes circuit for halloween gadgets

Basic-Circuit
Here’s a super handy/easy circuit for making LED eyes blink for your Halloween gadgets and projects, Paul writes – “The eye blink circuit consists of a timer and light emitting diodes, which function as the eyes. The timer circuit for the blinking eyes is based on the 555 timer. Figure 1 illustrates the standard timer circuit. The resistors and capacitor on the left control the charge and discharge of the circuit, which runs the pulse rate and duty cycle of the timer. The values in Figure 1 were chosen for a eye blink rate of approximately a second or two and a duty cycle of 85%. This simulates the blinking rate of eyes. The variable resistor allows the eye blink rate to be adjusted.”Link.

Related:

  • Other 555 timer projects – Link.
  • MAKE Halloween projects – Link.
  • MAKE Halloween archives – Link.

8 thoughts on “Blinking eyes circuit for halloween gadgets

  1. If you have a source for the LM3909, please share it with the rest of us.

    It is a fantastic chip, but it was discontinued years ago, I haven’t seen them available for ages.

  2. Allelectronics.com has a variable 2 LED flasher kit also

    ADJUSTABLE LED FLASHER KIT
    Two potentiometers adjust the flash
    rate of two LEDs. 9V operation.
    CAT# MK-1021
    $4.95 each

    I used this to control the flash rate on my “Crank Ghost” since it was simple, cheap, and I was running short on time.

Comments are closed.

Tagged

current: @adafruit - previous: MAKE, popular science, hackaday, engadget, fallon, braincraft ... howtoons, 2600...

View more articles by Phillip Torrone