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Sensors / Detectors: Automotive Circuits
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Automotive: 
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Last Updated: December 31, 2017 09:55 AM
Circuits Designed by Dave Johnson, P.E. :

Car Ignition 12v Switch - A Discover Circuits visitor needed a way to redirect +12v DC in his car to some auxiliary loads whenever the car’s engine was running.  Many cars have cigarette lighter outlet jacks, which are either live all the time or become live when the car’s engine is running . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2012

Check Engine Beeper - When driving down a busy road, you may not notice a “check engine” indicator light that suddenly turns on within the car’s instrument panel.  You could drive for many miles before noticing the light.  To provide an audible indication of trouble, the hobby . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-368-7747




Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Car PreAmplifier & Artificial Earth -  Especially for car audio installations, can be used for any single supply system __ Designed by Rod Elliott  ESP

Car Radio Booster -  One solution for increasing the power of an amplifier running on a low-voltage supply, like a car radio powered from at best 14 V, is to use a ‘bridge’ configuration, i.  e.  to connect.  must register on this site __ Designed by Published in Elecktor July/Aug, 2010

Car Reverse Horn -  This car reverse horn can be used with any vehicle having a 12V battery.  Transistors T2 and T3 form an astable multivibrator (AMV) that generates beeping tone signals.  Medium-power pnp transistor...__ Electronics Projects for You

Car speed Detection Device -  Door lock is easy to forget.  Even if it does not lock there is seldom case the door opens during travelling.  Even with, when you are getting a child, the child plays and may open the door.   __ Designed by Seiichi Inoue

Car Subwoofer Driver -  22W into 4 Ohm power amplifier; Variable Low Pass Frequency: 70 - 150Hz __ Contact Flavio Dellepiane, fladello @ tin.it

Car Tachometer -  A 555 is configured as a monostable or one shot in this project.  The period of the 555 is determined by the 47k and the capacitor from pin 6 to ground (100n).  Time "T" = 1.1 RCor1.1 X 50, 000 X 0.1X10 -6=0.0055 or 5.5 mS (milli-seconds) __ 555-Timer

Car timer power controller AtTiny45  -  Automotive, car and motorcycle electronic circuit diagrams / circuit schematics __ Designed by Thomas Scherrer OZ2CPU

Car Window Closer -  This circuit automatically rolls up a car’s electric windows when it rains.  The windows are rolled up one at a time while the system monitors the window motor current.  When the motor stalls, the system moves to the next window and shuts off it’s the last  __ Designed by Andrew R. Morris

Car-Reversing Audio-Visual Alarm -  Here is a simple car-parking alarm circuit based on an AVR microcontroller and an ultrasonic module.  The circuit will alert you while you are reversing your car for parking, if there...__ Electronics Projects for You

Car-Reversing Horn with Flasher -  Here is a simple circuit that starts playing the car horn whenever your car is in reverse gear.  The circuit (refer Fig.1) employs dual timer NE556 to generate the sound....__ Electronics Projects for You

Charge Monitor for 12 Volt Rechargeable Lead Acid Battery -  A battery is a vital element of any battery-backed system.  in many cases battery is more expensive than system it is backing up.  Hence we need to adopt all practical measures to conserve battery life.  As per manufacturer's data sheets, a 12V rechargeable lead-acid battery should be operated within 10.  iV and 13.8V.  When battery charges higher than 13.8V __ 

Check Engine Beeper -  When driving down a busy road, you may not notice a “check engine” indicator light that suddenly turns on within the car’s instrument panel.  You could drive for many miles before noticing the light.  To provide an audible indication of trouble, the hobby . . . Hobby Circuit designed by David Johnson P.E.-July, 2006

Circuit Helps to Protect a Vehicle-Reverse Camera -  10/06/11  EDN Design Ideas:  Add a delay to prevent short power pulses as you shift through reverse.   __ Circuit Design by Aruna Rubasinghe

Circuit Multiplexes Automotive Sensors -  01/20/00 EDN Design Ideas:  Often, aµC limits the number of input-capture lines to accommodate the various types of automotive sensors with pulsed outputs, such as vehicle- and engine-speed sensors.  The circuit in Figure 1 uses discrete components to multiplex two sensors with open-collector outputs into a single output, thereby sharing one input-capture line of the µC.  The µC selects the sensor whose output you will measure.    __ Circuit Design by Adil Ansari

CMOS Based Motorcycle Alarm -  Motorcycle Alarm Circuits:  This circuit features an intermittent siren output and automatic reset.  it can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition.  By adding external relays you can immobilize the bike, flash the lights etc.  it's easily adapted for a 6-volt system - so it will protect your "Classic Bike". - Now With Free SiMetrix Circuit Simulation.  __ Designed by Ron J.

CMOS Based Single Zone Alarm -  Single-Zone Burglar Alarm Circuits:  This circuit features automatic Exit/Entry delays, timed Bell Cut-off and System Reset.  it has provision for normally-open and normally-closed switches and will accommodate the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil Tape, PiRs and inertia Sensors).  __ Designed by Ron J.

CMOS Based Vehicle Anti-Theft Alarm -  Automobile Alarm Circuits:  This car alarm circuit features Exit and Entry delays - an instant alarm zone - an optional intermittent siren output - and an automatic Reset.  By adding external relays you can immobilize the vehicle and flash the lights.  __ Designed by Ron J.

Complete 12V Automotive Undervoltage, Overvoltage & Reverse-Supply Protection -  The LTC4365 is a unique solution that elegantly and robustly protects sensitive circuits from unpredictably high or negative supply voltages.  The LTC4365 blocks positive voltages as high as 60V and negative voltages as low as –40V.  Only voltages in the safe operating supply range are passed along to the load.  The only external__ Linear Technology/Analog Devices App Note, Sep 19th 2011

Daytime Running Lights Controller -  Auto makers have been gradually switching to light emitting diode (LED) lighting for automotive headlamps because of its features such as high efficiency and long service life.  in addition, from a...__ Electronics Projects for You

DC 12V to DC 50V Converter for Car -  This is DC to DC circuit for Car audio.12V input from car battery produces 50V DC.  Circuit uses TL072 IC and 2N3055 bipolar transistors.  __ 

Digital speedometer for cars with 7-segment display of speed -  This page describes the digital speedometer I built in 1995 for my Datsun 1200 __ Designed by Martin Pot

Digital Voltmeter for Your Car -  A PIC  microcontroller makes it a snack to build.__ SiliconChip

Dome Lamp Dimmer -  A reading light inside the car greatly assists passengers during night, but often the interior dome lamp is too bright and distracting to the driver.  A linear regulator such as a...__ Electronics Projects for You

Dome Lamp Dimmer -  This unique circuit makes your dome light look cool.  Usually when the car door is closed, the dome light just goes OFF.  With this circuit, you can have our dome light fade slowly.   __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Dome light dimmer (with Delay) -  For all you guys out there that want a fading dome light (aka courtesy light aka theatre lighting) without having to pay for one, you can build your own.  I have attached the schematics and you can build it for a few bucks given that you don't have any spare components lying around otherwise it can cost you absolutely nothing.  Of course you can rip some parts from your TV, CD player, radio, etc.  , but i'm not responsible for the damage you cause this way [b:e43bc460fa]The way it works[/b:e43bc460fa] I won't bother you with technical__ 

Dome light dimmer for Cars -  This unique circuit makes your dome light look cool.  Usually when the car door is closed, the dome light just goes OFF.  With this circuit, you can have our dome light fade slowly in brightness and finally go OFF.  This slow dimming of the light gives a very good feeling at night.  it looks very romantic!  __ 

Dome Light Extender -  There are countless dome light extenders on the Net and in magazines, but most of them suffer from one problem complexity.  Ok, they are not actually complex, but most are far more complex than they need to be.  Some are completely over the top, and require additional car wiring, a PCB, IC s, trimpots and lots of other stuff, while others seem to be someone's untested idea or maybe just a brain fart - some circuits I saw will never work.  My goal was extreme simplicity, and I think that has been achieved.   __ Designed by Rod Elliott  ESP

Door lock cancellation switch -  This is the circuit where can open the door of the car even if there be not a key.  The switch that cancels door lock is set up to the car __ Designed by Seiichi Inoue

Door mirror Controller -  As for the recent car, the door mirror is popular thing and the electromotion housing type is used usually.  Even my car is a door mirror type, but the electromotion housing function was not attached __ Designed by Seiichi Inoue

Economy radar Detector -  Automotive, car and motorcycle electronic circuit diagrams / circuit schematics__ 

Electronic car ignition -  This scheme is for 4 cylinder motor.  This will make your car spent less fuel, be a little bit faster and you won’t have to frequently open your distributor cap to change the contact buttons thus wasting less money.   __ Designed by EDY Cornholio

Electronic Chime -  Scroll Down to find this circuit.  This circuit simulates a chime similar to the sound many cars make when the keys are left in the ignition.  The bottom two gates form a squarewave audio oscillator that drives the base of the 2N4401, turning it on and off at an audio rate.  The top two gates produce a short low-going pulse about once per second that discharges the 10 uF capacitor through the diode.  The voltage then jumps up and slowly decays __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Electronic Combination Lock -  This 7-digit combination lock can be easily hard-wired for any combination that you choose.  The circuit uses a 4-bit, divide-by-8 Johnson counter (IC 1) , ten pushbutton switches and npn transistor T1.  At power-‘on, ’...__ Electronics Projects for You

Electronic combination lock based on PIC -  This is my electronic combination lock to use with an outdoor gate.  The functionality is implemented in software.  it turns on a relay (usually to open a door) for a few seconds.  Uses a PIC 16F84A.   __ Designed by Peter Jakab

Electronic Combination Lock with AVR -  CodeLock AVR electronic combination lock is realised with Atmel AVR microcontroller AT89C2051 or AT90S2313 or ATtiny2313 or ATtiny45.  Program in hex code is 2 kB long.  One user code (Ver.1) is consisted of 1 to 8 digits.  One user code (Ver.2.1, 2.2, 2.3) is consisted of 1 to 4 digits.  if you buy the chip (Ver.2.1, 2.2, 2.3) than you can enter 1 or 8 user codes that are consisted of 1 to 9 digits. 
__ 

Embedded Automotive (6V to 36V Input) to 5V/3.3V/1.8V/1.2V Output Peak-Power Controller using Two Supercapacitors -  The LTC4425 is a constant-current/constant-voltage linear charger designed to charge a 2-cell supercap stack from either a Li-ion/Polymer battery, a USB port, or a 2.7V to 5.5V current-limited supply.  The part operates as an ideal diode with an extremely low 50mΩ on-resistance making it suitable for high peak-power/low average__ Linear Technology/Analog Devices App Note, Mar 24th 2010

Emergency Light & Alarm -  Powered by two AA Ni-CD batteries; Four switchable options __ Contact Flavio Dellepiane, fladello @ tin.it

Engine Control unit Schematics -  The original plans for the ECU called for a very simple unit designed to keep the engine within parameters.  I was going to use a Basic Stamp 2, a pressure transducer, and a thermocouple.  As work progressed, I realized that greater functionality could be obtained with a proper tachometer, and the use of a faster, more capable, compiled Microchip controller.  I will leave these circuits posted, but the final ECU will make much greater use of the inherent capabilities of the PIC 16F876, 28-pin microcontroller, especially for tasks like driving the pump and the glow plug.__ 

Ethernet Interface for Automation Systems -  Communication with remotely located automation systems is possible via the internet.  A physical communication port with a network is required for this communication.  An Ethernet interface can be used for that...__ Electronics Projects for You

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