An application field of electronics that requires high reliability and fail-safe systems. Application can vary widely in temperature ranges and a wide voltage range, typically 12v (or 24v) while off and higher when on.

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53 views

Appropriate BJT for car circuitry

I am designing a LED Headlight for my car. But I am confused about my BJT, I dont know if it is suitable or not. The overall design is given below. The problem is, when I run the ckt under engine ...
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54 views

What tool can monitor voltage on a bundle of wires?

I'm working on a vehicle and trying to determine which wires control which circuits - power windows, power locks, starter, trunk release, etc. I've searched but have not been able to find the wiring ...
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1answer
71 views

How to calculate solar panel setup?

I have an equipment which draws 550W at a constant level, no peaks. I want to power this unit with solar cells only during the day when there is light using a simple car battery. Because I don't want ...
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0answers
57 views

Can AC/DC conversion losses from solar panels be avoided with a Tesla Powerwall?

(background: I'm just playing with numbers, trying to estimate how many solar panels would be needed to fully supply the energy for a home and 2 Tesla cars) I've been reading up on solar panels and ...
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1answer
40 views

Converting 12VDC to 7..9VDC (20A)

I used to have a 3-coil cooling fan that would rotate slow or fast depending on what is powering it - the air conditioner "signal" would make it rotate slower than that of the engine heat sensor. Now ...
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33 views

Low power reliable motion state sensor for car

I am looking for a sensor to reliably determine the state of motion of a car (passenger, van, forklift, tractor). I will not disclose the nature of the project at this time but a similar sensor ...
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3answers
86 views

Insufficient current to drive automotive relay?

I'm adding a leisure battery to my van so I can run some stuff with out fear of draining the starter battery. My leisure battery is wired to my starter battery so it can charge from the alternator ...
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1answer
70 views

How would you jerry-rig an android phone for continuous autonomous operation?

I want to use an android phone as dash-cam with GPS tracking capabilities. It is supposed to run 24 hours a day, 365 days a year. If the phone / app hangs, the user cannot be expected to ...
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1answer
23 views

Autoelectrics: Testing components off 12v battery

I'm quite good with mechanics and am just starting to learn more about electrics specifically applicable to automotive. One thing I am still yet to get the grasp of is the way electricity behaves. It ...
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4answers
961 views

Checking when a car horn is pressed?

I want to detect when a car horn is pressed. The only way I can detect it currently is using the voltage on its line. When the car is turned on, there is always 12V being supplied to the horn through ...
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2answers
65 views

Basic 12V Step-Start Circuit For Automotive Fans: Troubleshooting

To keep this short and sweet, I wanted to make a circuit/controller to decrease the inrush current on a large powerful fan for my race car. I ideally just wanted something that wouldn't let the amps ...
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2answers
61 views

Driving a large, noisy, free-wheeling DC motor (cooling fan)

I have an automotive cooling fan which is nominally 12v and draws about 15-25A with a BIG inductive spike at startup (will happily blow a 30A fuse). These are traditionally wired via standard ...
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3answers
100 views

Proton current? and its potential effects in cars and circuitry

Is this statement true: "Within the (lead-acid) battery, the electric current is primarily due to proton (hydrogen ion) current which is in the same direction as the electric current." What are the ...
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2answers
26 views

Stopping Vehicle Mounted Units from stopping abruptly

I have installed a touchscreen computer in my old car. The computer runs on 12V DC power supply. I have installed a standard 24V DC to 12V DC converter to power the computer. The 24V DC input to the ...
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1answer
54 views

Car speed sensor to turn on something [closed]

Is there a sensor for the speed of the car that can be programmed to turn on something when a car reaches to a specified speed? If yes, what is it’s name, and whare to find it online?
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33 views

Need Help On Proper Circuit

So I am building a NFC unlock for my car using an arduino and an NFC reader. So this means the arduino should be on all the time, unless you can think of a better idea. Right now I plan on having a 6v ...
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2answers
91 views

How to mix to video sources into a split screen (two inputs, one output)

I want to build a circuit for my car (It has two cameras, front and rear) that shows me the front and rear camera in the same screen (splitted), top half the video from the front camera and bottom ...
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2answers
80 views

PCB design for automotive fusebox?

I am currently in the process of designing an automotive (motorsport related) fuse-box as a side project to my studies. I've not had much luck searching for fuse holders (20 position) however while ...
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1answer
109 views

How can I power a cellular phone for a week with a car battery or other type of battery?

I am about to start construction of a new house, and unfortunately the property is not near where I live. I wanted to keep an eye on the construction site (No electricity) to make sure workers are ...
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4answers
180 views

Heating a 1km long wire to 110 C using a 12v supply from a car cigarette lighter

I am a complete newbie to anything electrical/electronics. I am doing a project where I need to heat a 1 km long (Nichrome/Kanthal) wire to up to 110 degree Celcius. The only power supply available is ...
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1answer
89 views

Car Ground Point Requirements

I work on a car structure precisely on a body in white which include parts in aluminium and some others in carbon fiber... I wonder if there are any requirements for the location, number of ground ...
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1answer
43 views

CDI ignition timing design

In CDI, the magneto-flywheel assembly along with pickup coil generates ignition timing signals which is one negative and one positive pulse separated by some angular distance used to decide the ...
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3answers
105 views

Op Amps and High Pass Filters; Low Audio Volume [closed]

I'm working on an audio crossover for a friend's stereo system. I have a passive design that uses a single 330uF in series with the positive audio line. It works like a charm , but I'd like to see if ...
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1answer
31 views

Audio High Pass Crossover Question

I'm doing a sound system for\with a friend of mine (I've done many, many before).... In the past I've done either simple L\C or LC crossovers, but I've been looking around for something I can build ...
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2answers
102 views

12 Volts or Nothing

Hello so I am hooking up a LED strip to my car but I am having trouble with the dimmer on the dashboard. To make this very simple and easy what I am trying to achieve is to cut off the power from the ...
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1answer
187 views

How to test for live wire in a car using an analog multimeter?

Let's say I cut my headlight harness off. Inside the wire loom, there are three orange wires, like this: I know one of them is for low beam, one for high beam and one for ground. I have an analog ...
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34 views

Waterfall diagram for car starting coil signal/interference

Does anyone have a waterfall diagram for the signal given off by an ignition coil when a car starts (or is operating)?
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23 views

Creating a pulse when the circuit opened and closed [duplicate]

I would like to send wake up and halt signal to a linux board. I just want simulate the power button on the board so I will replace it with a circuit. So: When I the car's ignition line is on it has ...
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1answer
96 views

Measuring the resistance of a button

I need to know the resistance value of buttons on a car steering wheel. Therefore, my question is: How do I measure the resistance of a steering wheel button using a digital multimeter? I don't ...
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1answer
91 views

Electronic Ignition

I have a friend online and he gave me a schematic to make an Electronic ignition module for motorcycle, I just want to know that if this is the working circuit? also I m not getting some parts here in ...
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1answer
298 views

How do I wire a phone/AUX input into a car stereo?

My car came with a Blaupunkt 520 as the factory fit head unit. As it uses the on-steering-wheel controls, I don't really want to swap it out, but I do want to add the ability to plug a device into it ...
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3answers
304 views

CAN Bus Physical Layer Twisted pair or not

CAN bus is very common in automotive or vehicular applications. In our case, we are using aerial platforms with have CAN bus links between operator remote and ground control box. As is very typical ...
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1answer
142 views

switch 12V with 12V ACC (car)

I'm currently trying to design a circuit for my car which will switch itself OFF or ON depending on +12V signal from ACC(accessory) cable. Car is providing me a +12V battery power, +12V accessory ...
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2answers
126 views

Fuel Injection Control through OBD port?

I am trying to implement remote control of a car, by connecting a GSM device to OBD port. If someone is using my car, I need to remotely stop the vehicle by sending command. Upon sending STOP ...
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1answer
215 views

Beaglebone black gets shutdown signal when I move rc motors

I have a beaglebone black that I tucked inside an rc truck. I removed the radio control chip. Everywhere it had 3.9 volt logic I put in a 3.3v gpio control from the beaglebone. It works great I'm ...
2
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1answer
128 views

Is a 9.6µs over-voltage transient long enough to fry my circuit (Details inside)?

I am designing a board for a 12V automotive environment, with a variety of input voltage transients including load dump and permanent 24V over-voltage. I am using a TVS at the input to clamp to around ...
2
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0answers
39 views

Certification for automotive accessories?

I have read a number of posts here relating to certification of devices for sale in the US, but the majority of them pertain to emitters such as BLE and Wi-Fi. To keep it simple, I have 2 ...
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2answers
296 views

How to switch between two DC power sources powering a motor on an electric vehicle?

Background: For a university final project, my student group is investigating the possiblility of powering a motorcycle with two seperate batteries, each of a different chemistry (Lead-acid and ...
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85 views

AUTOSAR OS configuration example

As with version 3.0, AUTOSAR switched from OSEK-OIL to a XML based format in order to configure their OS. I'm looking now for an example of how this configuration can look like. The AUTOSAR ...
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1answer
60 views

If I have a device that transmits data over Bluetooth, is it possible to get at that data via a different device with my own custom code?

I am looking at building a tyre pressure info system for my car, but would like to make use of the existing receiver and transmitters that screw onto your tyre's valve stems. A model exists that ...
2
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1answer
159 views

Kvaser Leaf Light CAN BUS Simulator problems

I'm learning to use this tool Kvaser Leaf Light V2 with CAN-BUS. I'm stuck with some problems. I can read the packets around the CAN-BUS line from the car, I can save it in a text file, but when I ...
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3answers
256 views

What's the reason for wiring a relay this way?

I came across the following automotive wiring diagram: One thing I don't quite understand is the way they wired the relay. I've got two main questions. It appears to me that they used the exact ...
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0answers
123 views

Can a CAN bus support power over ethernet?

I'd like to reduce my loom for a battery box. Every time I run a line i.e. CAN or low voltage power, it has to be isolated from the master controller which communicates with each slave. I'd like to ...
4
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5answers
854 views

Most ideal wire termination for round screw terminals

My '60 Volkswagen Beetle uses a number of electrical components that are equipped with round screw terminals, like you can see in the picture below: What is the most ideal wire termination for ...
4
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2answers
312 views

Multiplexing a CAN bus

I want to use a small 8 bit microcontroller which has only a single CAN rx/tx, i.e. Atmel 32c1, but in my application I need to be able to send and receive requests from two CAN buses. I have read ...
4
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3answers
2k views

CAN bus simulation (automotive purpose) - tried Arduino and SparkFun

I repair electric powered steering systems for cars, especially Fiat, Alfa, and Lancya (Delphi manufacturers), and I'm in need of making some tool to test these reparations. I mean just turning it on, ...
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0answers
152 views

automotive positive negative and ground and switch connection

I am wiring auxiliary light. I want to use my oem switch (momentary) and replace the included push button. I've blew a few fuses, so it's probably better to ask here before I blew up more stuff. I ...
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123 views

CAN bus identifiers for the engine control unit of vehicles

I am working on diagnosing engine issues with an engine control unit (ECU) and the CAN bus available in vehicles. This is what I have found so far. Every manufacturer follows the ISO 15765-2 (ISO-TP) ...
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2answers
692 views

Car radio output voltage

I am working on an amplifier for a car radio for a friend of mine. He is away for few weeks so I can't measure the radio output. That's why I am asking here, does anyone know, what's the ...
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2answers
174 views

How to measure the current drawn by the radio and the headlights from car battery easily?

I wonder how much current is drawn from car battery when the headlights and the radio are fully open. Is there a way to measure the resistance of the radio or the headlights without unscrewing or ...