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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2
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2answers
40 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 ...
0
votes
2answers
62 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 ...
-2
votes
1answer
85 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 ...
0
votes
4answers
132 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 ...
0
votes
0answers
51 views

How to test charge-holding condition of car lead acid battery [migrated]

One of our cars recently had problems starting on a ~70°F day, after having the headlights on for 10-15mins with the engine stopped, post a 20 mile drive. The decision was to replace the battery, ...
2
votes
1answer
72 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 ...
0
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0answers
28 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 ...
-2
votes
3answers
89 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 ...
1
vote
1answer
29 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 ...
0
votes
2answers
86 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 ...
0
votes
1answer
87 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 ...
0
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0answers
31 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)?
0
votes
0answers
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 ...
-1
votes
1answer
86 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 ...
0
votes
1answer
80 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 ...
1
vote
1answer
131 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 ...
0
votes
3answers
133 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 ...
1
vote
1answer
103 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 ...
0
votes
2answers
86 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 ...
1
vote
1answer
154 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
votes
1answer
110 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 ...
1
vote
0answers
34 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 ...
1
vote
2answers
227 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 ...
0
votes
0answers
63 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 ...
0
votes
1answer
49 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 ...
1
vote
1answer
120 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 ...
0
votes
3answers
182 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 ...
0
votes
0answers
97 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
votes
5answers
676 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 ...
3
votes
2answers
234 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 ...
3
votes
2answers
1k 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, ...
0
votes
0answers
116 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 ...
0
votes
0answers
91 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) ...
3
votes
2answers
468 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 ...
0
votes
2answers
111 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 ...
0
votes
0answers
75 views

Are car batteries smart-charged?

I use controller based(smart) chargers for my car and motorcycle batteries when they are not in use. Reconditioning options on those actually extend the life of the batteries. Especially in colder ...
0
votes
1answer
86 views

Detecting whether a car is running

I need to design a circuit that will operate in a car, and the circuit needs to know when the vehicle is turned off. The circuit will run from its own battery, and it will basically be an alarm to ...
0
votes
0answers
64 views

Simplest possible circuit to pulldown a 12v line with delayed off? With caveats!

I'm trying to pull down a low-power automotive signal that normally floats high. The trigger is another line going high (12v brake light). I want a delayed off of a few seconds. The usual simple ...
0
votes
1answer
65 views

Bench testing OBDII dongle

I'm currently trying to connect my wifi obd2 dongle directly to a VW ecu that is powered by a bench power supply. I followed the guide here: ...
1
vote
1answer
123 views

Vintage electric car circuit problems

This circuit is in a vintage electric car. The 12 volt circuit works perfectly alone. The 36 volt circuit works perfectly alone. When both circuits are activated the contactor points bounce open and ...
1
vote
1answer
100 views

PIC operating temperature… “industrial” vs. “extended”

I am shopping for a PIC micro-controller for use in an automotive application. I noticed that PICs are offered in both "industrial" and "extended" temperature ranges ([-40C to +85C] vs [-40 to +125]). ...
0
votes
1answer
73 views

Car electronic accessories [closed]

I want to design a computer vision device that will act as a "driving assistant". The device will improve driving safety by acoustically or visually alerting the driver of certain hazardous situations ...
0
votes
1answer
110 views

Arduino in Ground-Chassis (Vehicle): Activate by grounding

I am working with an Arduino as a controller for an Aftermarket Heated Seats Kit and interface for the stock A/C Auto Control Panel (the car did not come with heated seats, and I acquired an A/C Panel ...
2
votes
1answer
380 views

Single wire CAN // Saab 9-3 I-Bus // GMLAN

I'm trying to control an instrument cluster from a 2008 Saab 9-3. It has 2 pins marked for I-Bus (both wires are green, continuity test shows they are tied together as shown here: Some sites also ...
0
votes
1answer
64 views

LEDs not lighting up with reverse bulbs on my truck

Recently purchased the WSFS-NW180-BK LED Light strip from superbrightleds.com, but the LEDs are not lighting up in conjunction with my reverse bulbs. I spliced the LED positive wire with the Reverse ...
0
votes
2answers
56 views

Ignore voltage below threshold

I am trying to detect the presence of +12v on V2 to trigger a digital pin on a micro controller. I am using an opto isolator as I am under the impression that it is the best way to isolate my ...
2
votes
2answers
871 views

Using LiFePO4 battery as car battery

I've had an idea of using LiFePO4 battery as replacement for car battery, since 4 of those in series make nominal 12.8V which is very close to standard 12V voltage. And depending on the cell we can ...
1
vote
0answers
143 views

PNP BJT as a 'switchable' flyback diode?

I have an automotive ignition coil which I'm using as an ignition source for a project I'm working on. During normal operation, the primary coil current will be interrupted periodically to induce ...
2
votes
1answer
145 views

Grounding for car stereo adapter PCB

I've built an audio adapter for car stereo system. It contains microcontroller, a connector to stereo system (a few data pins and line-level audio output), Bluetooth audio module (RN52) and power ...
-1
votes
1answer
245 views

Bipolar stepper motor (Alfa Romeo 156 speedo) w/ L293D

I would like to use my Alfa Romeo speedo in my simrig, I have got the cluster pinout and the speed signal is coming from the ABS (Just like any other car, my BMW cluster works like charm). The only ...