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Sensors / Detectors: Automotive Circuits
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Automotive: 
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Last Updated: November 30, 2017 10:28 AM
Circuits Designed by Dave Johnson, P.E. :
Beeper Indicates Check Engine - 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 A. Johnson P.E.-July, 2006

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:

Bar-mode LED-cluster sequencer -  Bar-mode LED-cluster sequencer.  Can drive up to 16 clusters.   __ Contact Flavio Dellepiane, fladello @ tin.it

Bar-mode Lights Sequencer -  Can drive up to 15 LEDs or LED-clusters; Selectable Bar-length __ Contact Flavio Dellepiane, fladello @ tin.it

Beeper indicates Check Engine -  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 A. Johnson P.E.-July, 2006

Bicycle back Safety Light -  Flashing 13 LED unit, 3V supply; Also suitable for jogger/walkers __ Contact Flavio Dellepiane, fladello @ tin.it

Bike Device -  PIC  Project  For starters, I mounted a 7 amp-hour gel-cell on the frame so that I wouldn't have to keep buying batteries for the headlight.  The headlight is a 12 watt Malibu light from Home Depot complete with a very good diffraction lens.  The horn is a scavenged auto alarm from Walmart.  I just use the horn with.   __ Designed by Luhan Monat-Mesa Arizona

BMW R Series Motorcycle Regulator Schematic -  A motor spins the "propeller", and a small microprocessor keeps track of time and changes the pattern on seven LEDs with exact timing to simulate a 7 by 30 array of LEDs.  it is an illusion, but it works nicely.   __ Designed by Boblick

BMW's i3 Electric Car Fuels Up With a Home Depot Generator -  17-Sept-2014   Christen Costa Gadget Freak BMW's i3 is an impressive piece of kit.  The frame of the car you have a Gadget Freak project you would like the world to see? Send a brief description of yourgadget and a photo to Executive Editor Jennifer Campbell.  Check out the Best of Gadget Freak-- Volume__  Gadget Freak Video

Brake Light Flasher for Motorcycles -  Several years ago one car manufacturer added a rapid flasher to their brake lights.  Wow!  Those things really got your attention when the driver stepped on the brakes.  But, if you ever had to stop behind one at a traffic light at night, you were likely to go into seizures from the strobing, rear lights covering your field of vision.  I think they dumped the idea __ Designed by Tony van Roon  VA3AVR

Brake Light Signal Module -  Generates 4 short flashes, followed by a steady on light; Can drive LED Arrays at currents up to 1 Amp __ Contact Flavio Dellepiane, fladello @ tin.it

Brakelight Flasher -  This is basically a flasher circuit modified to turn on and off a bulb instead of a LED.  it uses a 555 timer IC working as an astable multivibrator.  The flashing rate can be varied from very fast to a maximum of once in 1.5 sec by varying  preset VR1.    The ON time of  circuit is given by: TON= 0.69xC1x (R1 + VR1) second and  OFF time is: TOFF= 0.69xC1xVR1 second __ Designed by Radioland.nt.au

Brakelight hookup -  This circuit is NOT a pulser or flasher!  What's so special about this circuit? Well, the first third-brake light I installed I had to pull a wire from the Third Brake Light all the way underneath the carpet to the brake-pedal-switch and I thought it would be easier to pluck the signal of both brakelights via the trunk.  Bench-test your circuit first and apply power to the circuit,  __ Designed by Tony van Roon  VA3AVR

Breakdown Beacon -  This is a very simple automotive project you can keep in the boot of the car for those unfortunate occasions when you break down.  I hope this will not be very often but the chances of a breakdown are always greatest on a cold and windy night, just when you need some sort of warning to say you are laid-up at the side of the road.   __ Designed by Collin Mitchell

Capacitor Discharge Ignition -  The CDI ignition circuit produces a spark from an ignition coil by discharging a capacitor across the primary of the coil.  A 2uF capacitor is charged to about 340 volts and the discharge is controlled by an SCR.  A Schmitt trigger oscillator (74C14) and MOSFET (iRF510) are used to drive the low voltage side of a small (120/12 volt) power transformer and a voltage doubler arrangement is used on the high voltage side to increase the capacitor voltage to about 340 volts.  A similar Schmitt trigger oscillator is used to trigger the SCR about 4 times per second __ Designed by Bill Bowden

Car acceleration meter -    NOTE:  This page is available in Greek and English language.  This circuit it is count the acceleration from -1000mg up to +1000mg.  Can be used in lot of applications like cars, elevators, ramps and more.   __ Designed by Michael Karaoglanidis

Car Alarm & Immobilizer -  This circuit features automatic exit and entry delays - an optional 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.

Car Alarm Arming Horn Beep Canceller -  it's a great convenience that most modern cars come with a built in alarm, however it is nothing but noise pollution that the horn sounds when the alarm is armed.  Disconnecting the alarm system from the horn relay will eliminate this, but prevent the horn from sounding in the even of an actual alarm.  This circuit serves to silence the arming beep yet maintain the alarm by introducing a small delay into the signal.   __ Designed by Aaron Cake

Car Alarm Sound Booster -  For car alarms, emphasis should be put on hearing the audible alert and identifying it as belonging to your ‘wheels’.  Unfortunately, modern car alarm systems seem to have the more or less the same alarm sound — especially if they are from the same brand.  Also.  must register on this site __ Designed by Published in Elecktor July/Aug, 2010

Car anti theft wireless alarm -  This FM radio-controlled antift alarm can be used with any vehicle having 6to 12-volt DC supply system.  The minI VHF, FM transmitter is fitted in  vehicle at night when it is parked in  car porch or car park.  The receiver unit with CXA1019, a single IC -based FM radio module, which is freely available in  market at reasonable rate, is kept inside.  Receiver is __ Designed by Radioland.nt.au

Car Anti-Hijack Alarm No.3 -  Automobile Alarm Circuits:  Like the first two Hijack Alarms - if a door is opened while the ignition is switched on - the circuit will trip.  And after a few minutes delay - when the thief is at a safe distance - the Siren will sound.  But this time the engine does not go on to fail automatically.  instead - it will continue to run until the thief turns off the ignition.  Then the engine will not re-start. __ Designed by Ron J.

Car Anti-Theft Alarm & Immobilizer -  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.

Car Anti-Theft Guard -  Here is an easy-to-build car anti-theft guard.  The circuit, shown in Fig.1, is simple and easy to understand.  When key-operated switch S2 of the car is turned on, 12V DC...__ Electronics Projects for You

Car Back-up Alarm -  The brake lights of  automobile trigger this circuit on and off.   This save  annoyance of  alarm when it is not needed.   This is an older circuit which was published in Popular Electronics Magazine, but still a good circuit today.   __ Designed by Tony van Roon  VA3AVR

Car Battery Charger -  quickly and easily charge most any lead acid battery, automatically turns charging off when ready.   __ Designed by Aaron Cake

Car Battery Charger -  if Built and Setup Correctly, it will safely charge at 10 Amps and Automatically Regulate down to a Trickle Charge.  This Charger Can't be used as a Power Supply, Without having a battery in place.  The Battery MUST be Connected to get power out.   __ Designed by G.L. Chemelec

Car Battery Indicator -  Text is not English __ Designed by Smartkit

Car Battery Saver -  Prevents the complete discharge of the battery; when the door is left open accidentally __ Contact Flavio Dellepiane, fladello @ tin.it

Car burglar alarm -  No circuit description, schematic only__ CdS Electronic

Car Converter - 12V to 9V -  To get a more precise output voltage, replace zener diode Z1 with 10V and R1 with a 1Kilo ohm potentiometer.  A Coolrib for Q1 is optional but highly recommended.  You can replace Q1 for a more robust type to get more output amps depending on your requirements.  Simple circuit to power your 9 volt cassette recorder and other stuff __ Designed by Tony van Roon  VA3AVR

Car 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

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

Car Ignition Coil Driver from 12 Volts DC -  A Simple Circuit to run a Car ignition Coil to Obtain High Voltage.  Or a 12 volt to 110 or 220 volt transformer for low power applications.   __ Designed by G.L. Chemelec

Car Ignition Coil Driver from Direct 110 VAC -  This SCR Circuit can run a Car ignition Coil in your home, to Obtain High Voltage.   __ Designed by G.L. Chemelec

Car Light Bulb -  Quick increase-decrease delay;  One-shot operation  __ Contact Flavio Dellepiane, fladello @ tin.it

Car Loop Detector -  A Simple Circuit, but not as Stable as I would like.  Bury the coil in your driveway and it will detect any vehicle there.   __ Designed by G.L. Chemelec

Car Network Device -  PIC  Project  Our present car controller runs on a single PIC 16F870 micro and provides functions for remote door locks, headlight reminder, and car finder.  it is constructed using wire-wrap to allow for future expansion and is mounted using Velcro on the passenger side of the center console __ Designed by Luhan Monat - Mesa Arizona

Car NiCad Charger -  This circuit provides up to20-Volt output from a regular13.2V automotive battery, to enable constant current charging of NIC d battery packs up to15 cells AT 1.2V (Tony van Roon's 18V total).   __ Designed by Tony van Roon  VA3AVR

Car OBD II J1850 PWM, J1850 VPW, ISO-9141 cables schematic pinout -  Should be suitable to vehicles of most European and Asian manufacturers.  Alfa Romeo, Audi, BMW, Citroen, Fiat, Honda, Hyundai, Jaguar (X300, XK) , Jeep since 2004, Kia, Land Rover, Mazda, Mercedes, Mitsubishi, Nissan, Peugeot, Renault, Saab, Skoda, Subaru, Toyota, Vauxhall, Volkswagen (VW) since 2001, Volvo to 2004__ 

Car Porch Guard -  Protect your costly vehicle from theft using this electronic safety system.  The system immediately switches on the porch lamp and sounds a loud alarm as soon as it detects any attempt...__ Electronics Projects for You

Car power supply unit for digital projects, small car PCs etc -  Automotive, car and motorcycle electronic circuit diagrams / circuit schematics __ Designed by © Flemming Frandsen

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