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Sensors / Detectors: Automotive Circuits
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Automotive: 
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Last Updated: December 31, 2017 09:57 AM
Circuits Designed by Dave Johnson, P.E. :
RFID Smart Key Detector - The hobby circuit below was designed to indicate if a key held over the small coil of wire contains a 125KHz RFID chip.  These chips are often used in smart car ignition keys.  The left side circuit forms a 125KHz power oscillator, which drives the 680uH a . . . Hobby Circuit designed by David A. 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:

RD68HC908LHID : LIN-bus HID Lamp Levelling Stepper Motor Control using the Motorola 908E627 -  This reference design describes a car High intensity Discharge (HiD) lamp leveling system with a LiN-bus interface.  An essential part of the system is a stepper motor controller operating as a LiN-bus slave (LiN Stepper Controller).  All functionality __ Designed by Freescale

Realtime GPS+GPRS Tracking of Vehicles using Arduino -  Avoid car thef is impossible but now find your stolen car will be easier!  You just need to install your Arduino with the GPRS+GPS Quadband Module (SiM908) in a hidden place in your car, maybe in your trunk, in the glove compartment or under your spare tyre.  Then connect the GPRS-GSM and the GPS antenna and a SiM card, all of this powered with a battery and you are ready!  __ Designed by Libelium Comunicaciones Distribuidas S.L

Relay Based Motorcycle Alarms -  Motorcycle Alarm Circuits:  These are two - easy to build - relay-based alarms.  You can use them to protect your motorcycle - but they have many more applications.  if you use relays with 6-volt coils - they'll protect your "Classic Bike".  Both alarms are very small.  The completed boards occupy about half a cubic-inch - 8 cc.  The standby current is zero - so they won't drain your battery.  __ Designed by Ron J.

Remote Door Lock -  Recently, many cars are equipped with Remote Car Door Controller called Keyless entry.  On this page, I will introduce the equipment which changed a remote control for the engine start into the door lock __ Designed by Seiichi Inoue

Reverse warning Device -  Schematic only, no circuit description included __ Designed by Seiichi Inoue

RFID Smart Key Detector -  The hobby circuit below was designed to indicate if a key held over the small coil of wire contains a 125KHz RFID chip.  These chips are often used in smart car ignition keys.  The left side circuit forms a 125KHz power oscillator, which drives the 680uH a . . . Hobby Circuit designed by David A. Johnson P.E.-July, 2006

RTOs vendors Move to support automotive standard -  04/01/99 EDN Design Ideas:  NOTE:  File contains many designs.   Scroll to this one.  The Tornado for Automotive tool suite from Wind River (Picture) supports the OSEK automotive operating system initiative.  Tornado includes MotorWorks, an OSEK-compliant RTOS that the company acquired through its partnership with German software house 3Soft, and a fully integrated tool suite.  The OSEK automotive-industry initiative defines a scalable operating system for resource-limited systems __ Circuit Design by Graham Prophet

Rush Converter for the Car -  This converter allows an ordinary AM car radio to receive 15.42 MHz (WRNO).  A famous talk show is transmitted by this station.  The unit should be constructed in a metal box with antenna connectors compatible with the car radio.  The converter includes a relay which automatically bypasses the converter when power is removed.  A single power wire comes out of the converter box and goes to a power switch located in a convenient spot. (The unit is connected to ground through the coax.   __  Contact:  Charles Wenzel of Wenzel Associates, Inc.

Seatbelt reminder -  No circuit description, schematic only__ CdS Electronic

Sense Automobile High-Side Current with Discrete Components -  09/14/12  EDN Design Ideas:  Use this circuit to convert a current into a voltage for measurement.   __ Circuit Design by Larry Beaty, Beatys Mills, Comer, Georgia

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

Sequential Turn Lights Driver -  Four-LED left and right sequence; Particularly suited to motorcycles __ Contact Flavio Dellepiane, fladello @ tin.it

Simple Circuit but reliable car battery tester -  This circuit uses the popular and easy to find LM3914 IC .  This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source.   __ Designed by Jonathan Filippi

Simple Circuit but reliable car battery tester using LM3914 -  This circuit uses the popular and easy to find LM3914 IC . This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source.__ 

Simple Circuit car battery charger -  Automotive, car and motorcycle electronic circuit diagrams / circuit schematics__ 

Simple Circuit Car Battery Charger psimages -  This very simple circuit uses a transformer , two diodes , a capacitor and an ammeter.  To charge a battery just connect+ and terminals of circuit to corresponding terminals of battery.  When battery is not charged, ammeter reading shows 1-3 amps__ 

Simple Circuit car battery Tester -  This circuit uses the popular and easy to find LM3914 IC .  This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almost every source __ Designed by Jonathan Filippi

Simple Circuit car battery voltage Monitor -  A Very Simple circuit and some Variations.  Play with it.  All parts are cheap and should be easily obtained.   __ Designed by G.L. Chemelec

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

Simple 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

Simple Circuit Transistor Based Motorcycle Alarm -  Motorcycle Alarm Circuits:  This is an even simpler transistor based motorcycle alarm.  The circuit features a timed output and automatic reset.  it can be operated manually using a key-switch or a hidden switch.  By adding an external relay, it will set itself automatically - and/or immobilize the machine - every time you turn-off the ignition.  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.

Simple Circuit Vehicle Loop Detector (inductive loop for driveway etc) -  Another Simple But Very Effective Circuit __ Designed by G.L. Chemelec

Simulating Solar Sprint with Spice -  Simulation programs running on digital computers allow computer designers to predict the operation of new chips, aerospace engineers to predict the characteristics of new airframes, and architects to predict the thermal characteristics of new buildings, all without building anything.   __ Designed by Chuck Wright

Solid-state relays simplify Monitoring electric car battery-voltage -  02/19/04  EDN Design Ideas:  Figure 1 shows the propulsion system of an electric vehicle.  it includes an electric motor, drive electronics, a mechanical transmission, vehicle control/power management, a charging system, and a battery.  The long-term performance __ Circuit Design by Robert Krause, Fairchild Semiconductor, San Jose, CA

Speed Alarm for Cars -  in normal suburban driving you pass through so many different speed zones that it can be a nuisance having to switch speed settings.  The speed display can also be a distraction.  This circuit eliminates the display and the need for speed selection.  Each time you exceed a particular speed setting (eg, 40km/h, 50km/h, etc) , a piezo buzzer will beep.__ Col Edwards -  Co Silicon Chip Electronics Magazine

Speed Limit Alarm -  Wireless portable unit; Adaptable with most internal combustion engine vehicles __ Contact Flavio Dellepiane, fladello @ tin.it

Switch-mode Power Supply for a Tube Car Amplifier -  To minimize heat loss on any transistor, I use two pass FETs.  in the car, input voltage is either 11.5-12.5V (engine off) or 13.5-14.5V (engine on).  in the first case, T1 and T2 are fully ON, no need for heatsink.  in the second case, T1 is OFF, T2 ON, all voltage and power excess __ Contact klausmobile @ yahoo.Com

Synchronized multi-spark Module (SMSM) for Electronic Ignition Devices (EID) -  Multi-spark ignition is very useful especially in the case of startings at low temperature and at low rpm range.  Basic idea, is to apply to spark plugs instead of only one spark, a spark-burst having big energy.  in this case, combustion of air/fuel mixture is much better and the emissions are more reduced.  in addition, through burning improvement, the consumption of fuel can be reduced __ Designed by Dumitrescu Danut

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