Engineers Garage

  • Projects and Tutorials
    • Circuit Design
    • Electronic Projects
      • 8051
      • Arduino
      • ARM
      • AVR
      • PIC
      • Raspberry pi
      • STM32
    • Tutorials
    • Components
  • Articles
    • EG Blogs
    • Insight
    • Invention Stories
    • How to
    • What Is
    • News
      • EE Design News
      • DIY Reviews
      • Guest Post
      • Sponsored Content
  • Forums
    • EDABoard.com
    • Electro-Tech-Online
    • EG Forum Archive
  • Digi-Key Store
    • Cables, Wires
    • Connectors, Interconnect
    • Discrete
    • Electromechanical
    • Embedded Computers
    • Enclosures, Hardware, Office
    • Integrated Circuits (ICs)
    • Isolators
    • LED/Optoelectronics
    • Passive
    • Power, Circuit Protection
    • Programmers
    • RF, Wireless
    • Semiconductors
    • Sensors, Transducers
    • Test Products
    • Tools
  • EE Resources
    • DesignFast
    • LEAP Awards
    • Oscilloscope Product Finder
    • Video
    • White Papers
    • Webinars
  • EE Learning Center
  • Women in Engineering

Generating time delay using astable mode of 555 timer IC

November 30, 2018 By Ashutosh Bhatt

This circuit based project demonstrates the working of 555 timer in astable mode to generate pulses of time period 0.5 second. This pulse can be further used for anything where we need a pulse such as to blink a LED or to create fashionable blinking lights. Image below shows internal circuitry of NE 555 timer which can be used in astable and monostable mode:

[[wysiwyg_imageupload:7747:]]

Fig. 1: Prototype for Internal circuitry of NE 555 timer Circuit on Breadboard


This circuit of this project makes the use of timer IC NE555 which produces a constant square pulse of a desired frequency. This pulse could be either triggered or could be produced continuously depending upon the mode of 555 we are using. The two mostly used modes of 555 are Monostable and Astable. Here it is used in the astable mode with time period of half second, with high time period of 0.333 seconds and low time period of 0.166 seconds.

For astable mode total time period is [ln2C*(R1+2*R2)] with high time period as [ln2(R1+R2)*C] and low time period as [ln2(R2*C)]. Here R1 is the resistor connected between VCC and pin7 (discharge pin), R2 is between pin7 and pin2 (trigger pin) and C1 is the capacitor connected from pin2 to ground. For 555 to function in astable mode pin2 and pin6 (threshold) pin must be shorted. Reset pin is connected to VCC.
 
The output of 555 is taken at pin3 which is in the form of square wave and is then fed to lighting circuit which glows when output is high and stops when it becomes low; there by producing pattern of blinking lights. By varying the value of R1, R2 and C1 square waves of different time periods can be obtained.                    

 

Circuit Diagrams

Generating-time-delay-with-555-IC

Project Components

  • 555 Timer IC
  • Capacitor
  • Resistor

Related Articles Read More >

Wireless distance measurement using ultrasonic sensor
Computerized wireless Pick and Place Robot
Designing an Arduino-based ECG monitor using an AD8232 ECG sensor
Controlling Appliances Wirelessly using RF Technology

Featured Tutorials

  • Screenshot of Raspbian OS on Raspberry Pi RPi Python Programming 03: Raspberry Pi as Linux System
  • Raspberry Pi Models RPI Python Programming 02: Raspberry Pi Models
  • Raspberry Pi 4 RPi Python Programming 01: Introduction to Raspberry Pi 4
  • RPi Python Programming 05: Introduction to Python
  • RPi Python programming 04 RPi Python programming 04: Setting up Raspberry Pi Linux computer
  • Python Basics RPi Python Programming 06: Python basics

Stay Up To Date

Newsletter Signup

EE Training Center Classrooms

“ee

“ee

“ee

“ee

Recent Articles

  • Arduino’s L293D motor driver shield guide
  • NXP launches its first Wi-Fi 6E Tri-Band system-on-chip
  • Nexperia launches industry’s first 80 V RETs for high-voltage bus circuits
  • TDK releases low-profile medical sensors
  • Getting started with Raspberry Pi
...

RSS EDABOARD.com Discussions

  • hysteresis variation mc sim
  • Need help with Audio intercom design circuit?
  • complex bjt transfer function amplifier
  • Creepage distance from primary to secondary of offline SMPS
  • FT232 > Package

RSS Electro-Tech-Online.com Discussions

  • new to Ardunio but trying to compile
  • Engine Temperature using an AD590 on the Oil Pressure Wire to the engine
  • Dead Battery circuits.
  • electrolytic capacitor depolarizes
  • Symphonic TV/VCR problems (potentially loose yoke)...
Engineers Garage
  • Analog IC TIps
  • Connector Tips
  • DesignFast
  • EDABoard Forums
  • EE World Online
  • Electro-Tech-Online Forums
  • Microcontroller Tips
  • Power Electronic Tips
  • Sensor Tips
  • Test and Measurement Tips
  • 5G Technology World
  • About Us
  • Contact Us
  • Advertise

Copyright © 2021 WTWH Media LLC. All Rights Reserved. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media
Privacy Policy | Advertising | About Us

Search Engineers Garage

  • Projects and Tutorials
    • Circuit Design
    • Electronic Projects
      • 8051
      • Arduino
      • ARM
      • AVR
      • PIC
      • Raspberry pi
      • STM32
    • Tutorials
    • Components
  • Articles
    • EG Blogs
    • Insight
    • Invention Stories
    • How to
    • What Is
    • News
      • EE Design News
      • DIY Reviews
      • Guest Post
      • Sponsored Content
  • Forums
    • EDABoard.com
    • Electro-Tech-Online
    • EG Forum Archive
  • Digi-Key Store
    • Cables, Wires
    • Connectors, Interconnect
    • Discrete
    • Electromechanical
    • Embedded Computers
    • Enclosures, Hardware, Office
    • Integrated Circuits (ICs)
    • Isolators
    • LED/Optoelectronics
    • Passive
    • Power, Circuit Protection
    • Programmers
    • RF, Wireless
    • Semiconductors
    • Sensors, Transducers
    • Test Products
    • Tools
  • EE Resources
    • DesignFast
    • LEAP Awards
    • Oscilloscope Product Finder
    • Video
    • White Papers
    • Webinars
  • EE Learning Center
  • Women in Engineering