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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23 views

ABW Automotive DMM [on hold]

I have a 70617 ABW Automotive DMM. I was using it the other day and used the voltage range to measure a laptop backlight when I should have used frequency - accidently. I didn't think this would ...
0
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1answer
65 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
49 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
52 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
45 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
53 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
75 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 ...
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0answers
43 views

Would there be advantage using 2 smaller motors on Tesla car's rear axle? [migrated]

Let me be clear: I am speaking about the rear wheel drive model. After I've asked https://mechanics.stackexchange.com/questions/15342/number-of-motors-rwd-tesla , it seems Tesla's rear axle has only ...
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14 views

Number of motors RWD Tesla [migrated]

Tesla always speaks about one motor on its Rear Wheel Drive Model S car. But every time I see a picture of the rear axle as in the search ...
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0answers
2 views

Electronic Flasher replacement for LUCAS FL5 to work with both -VE and +VE cars [migrated]

This is about replacing a LUCAS FL5 3-prong flasher unit with a plug-and-play replacement circuit that will work with a much lower current than the FL5. The FL5 uses a bi-metallic strip and a heater ...
2
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1answer
82 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 ...
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0answers
26 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
127 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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0answers
31 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
44 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 ...
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1answer
58 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
139 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
49 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 ...
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5answers
463 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 ...
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2answers
127 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 ...
2
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2answers
428 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
71 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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0answers
58 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
242 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
76 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 ...
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0answers
67 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 ...
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1answer
75 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 ...
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0answers
54 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 ...
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1answer
47 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: ...
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1answer
100 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 ...
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1answer
85 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]). ...
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1answer
59 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
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1answer
82 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 ...
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1answer
219 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 ...
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1answer
57 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
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2answers
54 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
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2answers
377 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 ...
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0answers
124 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
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1answer
111 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 ...
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1answer
180 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 ...
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0answers
73 views

Why does ignition coil have polarity markings?

I know about one reasonable answer to this. The electron emission is easier from a hotter surface, which in a spark plug happens to be the central electrode. So we should connect this electrode to be ...
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1answer
85 views

Sequential Taillight Modification

I am interested in almost duplicating the functionality of the new Mustangs. When the rear tail lights are activated (there are 3 in a row on each side), I'd like the first one, then the second one, ...
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1answer
488 views

LED strip segments Parallel vs Serial

I have 5050 RGB LED Strip and an RGB controller (Something like this ...
0
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1answer
475 views

Jump start car from lithium ion laptop battery

Building the actual circuits is beyond me at this point, but I'm wondering if it's technically possible to jump start a car from the power contained in a large lithium-ion laptop battery. For ...
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6answers
2k views

Why is the chassis used as ground in automotive electrical circuits

Automotive electronics generally use the metal chassis as the negative ground connector for the DC circuits. Obviously this saves something on wiring. Is there an electrical reason for this approach? ...
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0answers
63 views

How to measure RF receiver

I am trying to check how electric devices such as Sunroof could affect the remote key performance range (meter) for cars. I am thinking of measuring relative antenna gain of RF receiver of one test ...
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0answers
107 views

Why are AC induction engines for electric cars so expensive?

I was reading about electric car engines and from what I've read there are 2 types available, DC brussless or AC induction ones. Each has its advantages and disadvantages but it seems the AC induction ...
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2answers
2k views

Why don't we get shocked when we touch a car?

According to this answer to a question about car batteries: [...] so the entire chassis is an extension of the minus terminal of the battery. If this is the case, I would expect that you'd get ...
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1answer
79 views

Simulating a load dump circuit [duplicate]

I am trying to build automotive load dump circuitry to bench test my inverter design. I would like to know if anyone has any experience building something like this. I need to create a 172V spike that ...
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2answers
178 views

Sense Automotive 12V Circuit from 3.3V microcontroller safely

I want to sense a circuit state in an Automotive circuit (12V nominal) from a 3.3V microcontroller (MSP430Gxxxx). The circuit is normally 12V (or VBat) until either the Wireless ECU or a Door Key ...