• Skip to main content
  • Skip to primary sidebar

Homemade Circuit Projects

Get free circuit help 24/7

Circuits for Beginners | Basic Circuits | LED Driver | Hobby Circuits | Transistor Circuits

New-Projects | Privacy Policy | About us | Contact | Disclaimer | Copyright

Home » Car and Motorcycle » Darkness Triggered Car Safety Park Light Circuit

Darkness Triggered Car Safety Park Light Circuit

Last Updated on March 13, 2019 by Swagatam Leave a Comment

In this post we discuss a circuit concept for enabling cars with an add-on automatic safety park light which triggers during night and signals the position of the car and consequently prevents a mistaken collision or dashing by another vehicle. The design ensures minimum consumption and relatively higher brightness for the involved LED lights. The idea was requested by Mr. Ankit.

Technical Specifications

Kindly advise on the following circuit

1. A 12V circuit is desired to be designed to light a 12V LED, such that it lights the LED in pulses (that is to say that the current to led is sent intermittently (say once every 1 minute roughly) and the current pulse stays for a brief duration (say 5 seconds roughly))

2. So, the LED lights repeatedly once every 1 min and stays on for roughly 5 sec each time.

3. It is also desirable that the above circuit starts working automatically when it is dark and stops when the atmosphere is lighted.

4. The above circuit is intended to be used in a parked car so that the LED keeps blinking in the rear when car is parked in dark and the cycle stops when it is day time.

5. Further, as expected, when the car is driven at night, its rear red lights will be on and the blinking LED will no longer be needed. So, it is desired that in some way a 12V +ve signal feeded to the circuit from rear red lights (when glowing) should stop the blinking cycle of the circuit.

The significance of the proposed darkness triggered car safety park light is as follows... Mostly at night the cars are parked by the roadsides due to shortage of space inside homes.

Often it is very dark due to absence of street lights or lack of electricity supply. So sometimes pedestrians, cycles or rikshaws or few vehicles without headlight bump into the cars.

An intermittently pulsing LED as requested above would mark the presence of car, at the same time without undue battery drainage.

When there is surrounding light in daytime or when the car is being driven, this blinking light would not be needed, So an LDR may turn off the circuit and also during driving the 12V +ve supply from car rear light would in some way turn off the blinking led. Sir, it will be so kind of you to help on the above mentioned aspects of the circuit.

Dr Ankit

Darkness dependent Car Safety Park Light Circuit

The Design

The requested darkness triggered car park light circuit can be made as per the above shown circuit details.

The entire circuit is build around a single IC 4093, the gates N1 to N4 are from this IC which are appropriately configured with the associated passive components.

N1 is wired as darkness sensor through the connected LDR across its input and ground. The pot determines the sensitivity control can be set for triggering N1 at the desired darkness level.

N2 is wired as a PWM control frequency generator stage, the associated pot can be used for setting the required degree of ON or OFF time to the LEDs and consequently control their average brightness and consumption.

N3 is used like a buffer, whose output is connected with the base of the driver transistor TIP122 which responds to the fed PWMs and drives the LEDs with the corresponding amount of brightness.

The gate N4 is positioned to stop the TIP122 conduction and the LED illumination whenever the tail lights are detected ON, meaning while the taillight bulbs are ON, the proposed darkness triggered park lights are shut off.

On the other hand, when a darkness is detected, N1 input is rendered negative which forces its output to go high, this high signal inhibits the oscillatory action of the N2, and causes its output to go low.

With N2 output is low, N3 output is accordingly prompted to go high, which in turn switches ON the TIP122 transistor and the LEds. This positioned is held in the LED switched ON position (and flashing) until the darkness persists and dawn sets in, or/and the tail lights are switched  ON.

You'll also like:

  • 1.  Rain Triggered Instant Start Windshield Wiper Timer Circuit
  • 2.  Understanding Motorcycle Voltage Regulator Wiring
  • 3.  Police/Ambulance Siren Circuit with Rotating Beacon Light
  • 4.  Motorcycle Regulator, Rectifier Tester Circuit
  • 5.  GSM Car Ignition and Central Lock Circuit Using Arduino
  • 6.  Model Locomotive Infrared Controller Circuit

About Swagatam

I am an electronic engineer (dipIETE ), hobbyist, inventor, schematic/PCB designer, manufacturer. I am also the founder of the website: https://www.homemade-circuits.com/, where I love sharing my innovative circuit ideas and tutorials.
If you have any circuit related query, you may interact through comments, I'll be most happy to help!

Subscribe2


 

Reader Interactions

Your Comments are too Valuable! But please see that they are related to the above article, and are not off-topic! Cancel reply

Your email address will not be published. Required fields are marked *

Primary Sidebar

Categories

  • 3-Phase Power (15)
  • 324 IC Circuits (19)
  • 4017 IC Circuits (53)
  • 4060 IC Circuits (25)
  • 555 IC Circuits (98)
  • 741 IC Circuits (19)
  • Amplifiers (58)
  • Arduino Engineering Projects (82)
  • Audio Projects (94)
  • Battery Chargers (82)
  • Car and Motorcycle (94)
  • Datasheets (46)
  • Decorative Lighting (Diwali, Christmas) (33)
  • DIY LED Projects (89)
  • Electronic Components (97)
  • Electronic Devices and Circuit Theory (35)
  • Electronics Tutorial (109)
  • Fish Aquarium (5)
  • Free Energy (35)
  • Fun Projects (11)
  • GSM Projects (9)
  • Health Related (18)
  • Heater Controllers (28)
  • Home Electrical Circuits (101)
  • How to Articles (20)
  • Incubator Related (6)
  • Industrial Electronics (28)
  • Infrared (IR) (40)
  • Inverter Circuits (98)
  • Laser Projects (12)
  • LM317/LM338 (21)
  • LM3915 IC (25)
  • Meters and Testers (63)
  • Mini Projects (171)
  • Motor Controller (66)
  • MPPT (7)
  • Oscillator Circuits (24)
  • PIR (Passive Infrared) (8)
  • Power Electronics (33)
  • Power Supply Circuits (74)
  • Radio Circuits (9)
  • Remote Control (47)
  • Security and Alarm (61)
  • Sensors and Detectors (116)
  • SG3525 IC (5)
  • Simple Circuits (74)
  • SMPS (29)
  • Solar Controllers (61)
  • Timer and Delay Relay (54)
  • TL494 IC (5)
  • Transformerless Power Supply (8)
  • Transmitter Circuits (40)
  • Ultrasonic Projects (14)
  • Water Level Controller (45)

Circuit Calculators

  • AWG to Millimeter Converter
  • Battery Back up Time Calculator
  • Capacitance Reactance Calculator
  • IC 555 Astable Calculator
  • IC 555 Monostable Calculator
  • Inductance Calculator
  • LC Resonance Calculator
  • LM317, LM338, LM396 Calculator
  • Ohm’s Law Calculator
  • Phase Angle Phase Shift Calculator
  • Power Factor (PF) Calculator
  • Reactance Calculator
  • Small Signal Transistor(BJT) and Diode Quick Datasheet
  • Transistor Astable Calculator
  • Transistor base Resistor Calculator
  • Voltage Divider Calculator
  • Wire Current Calculator
  • Zener Diode Calculator

Facebook
Twitter
YouTube
Instagram
My Facebook-Page
Quora

© 2022 · Swagatam Innovations

We use cookies on our website to give you the best experience.
Cookie settingsAccept All
Privacy & Cookies Policy

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Please visit the Privacy Policy Page for more info.
Necessary
Always Enabled
Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
Non-necessary
Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
SAVE & ACCEPT