Questions tagged [automotive]

Questions about the design of electronics for use in an automotive environment. (Questions about the installation and use of automotive electronics are unlikely to be appropriate for this site.)

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19 views

Trying to power up Amazon Echo in car

So I want to connect my car with Amazon echo show. Currently I connected it to the 12 v power output( cigarette lighter ), however when the car is started the power is interrupted ( while starting the ...
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26 views

What would be the best microcontroller to target that has CAN and some pwm analog and digital i/o that is easy to program? [closed]

I want to build an automotive support board that has some pwm, analog/digital i/o and maybe some h-bridges. I know C and a little C++. I plan to build this layout this board and build it. I am ...
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2answers
114 views

Zener diode response time

I have the below circuit: Forward diode D0002 - Datasheet SIJ series for reverse protection and C0001-C0004 capacitors for ESD protection. Zener diode - Datasheet - 36V reverse breakdown. Question : ...
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1answer
39 views

Composite video from rear car camera - bad signal (wrong levels?)

I have bought a car radio (AMPrime 4022D) that has ability to connect rear camera to it, so you can see the image on its screen. The problem is that radio doesn't detect the signal (blue screen). But ...
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36 views

Making subwoofer for car, without amplifier

So, I have these two things and I want to achive a good subwoofer for my car: an 5.1 home theater system with a 20-30w 4ohm subwoofer and a radio player in my car with 4x45w 4ohm output for speakers. ...
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2answers
38 views

Automotive filter against voltage spikes

I am building a electric vehicle relay controller. Which controls the High voltage relays among other things. I have built an automotive power supply circuit with strong inspiration from this article: ...
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1answer
36 views

Automotive Sensor Output

Why does the automotive industry sticks with 5V sensor outputs instead of something like 4-20 mA? Wouldn't it be a solution less prone noise? What are the advantages in using a 5V output instead of a ...
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1answer
55 views

Is using a wire rated the same as its circuit's fuse OK?

I want to add a kill switch on the fuel pump relay in my car, which includes extending a line connected to a 15A fuse. I bought some 15A auto wire, but on reflection I'm not 100% sure if that's right. ...
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2answers
47 views

Car amp burned out component [closed]

I need help identifying this component on the board of my car amp that has burned out. Electronic circuit board knowledge is pretty much zero for me. But I’m good at fixing stuff so I want to try to ...
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2answers
88 views

Confusion regarding jump starting a car

I tried to understand what is going on when one jump starts a car with a dead battery and reading through a lot of explanations, one question remained: You start by connecting the the + poles with the ...
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1answer
68 views

Using car radio output jacks for input

On the backside of my Sondpex RUSX903 car radio I found two RCA jacks: a red and a white one. With an adapter cable I connected these to my cellphone headphone jack. So far so good, I noticed two odd ...
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71 views

Electric noise issues in classic car

I tried hooking up a Raspberry Pi (+Hifiberry needs 12 V to 18V input voltage) to my classic car (to be used as music player, radio, BT speaker, no screen, only 2 rotary encoders to navigate through ...
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1answer
33 views

Car flasher circuit and grounding

My car flasher circuit can be simplified like so : The factory flasher unit is a standard 2 pin that plugs in series with the switch and the load (indicator lights). I'm attempting to make my own ...
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1answer
53 views

Can a 12V (automotive) relay carry more than 12v?

Everywhere I dig around the web (in forums etc.) I see people not recommending more than 12v to go on an automotive relay. Let's look at this one for example: I understand they have been designed for ...
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3answers
74 views

Old lead-acid battery inrush charging current

Can an old lead-acid battery have an usually high inrush charging current, such that the alternator belt squeals for the first 30-90 seconds after the engine is started? It is worse in hot weather. ...
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66 views

Will adding a DC-DC converter affect how a modern car operates?

I'm thinking of adding a wireless charger to my car, and adding a Buck Converter to step down the 12V source to 5V for efficiency sake. However, I am worried about the emissions from the DC-DC ...
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1answer
21 views

ISO 9141, LIN Bus, K-Line compatibility

I'm designing an automotive scan tool. For now, I'm studying about ISO 9141 and LIN Bus physical layer compatibility. I have a legacy hardware that uses L9637 to perform ISO 9141, through K-Line, but ...
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2answers
96 views

Automotive Load Dump Protection Circuit

Currently I'm working on a project that will be implemented in a 12V automotive electrical system. To protect the onboard DC/DC, I decided to add reverse polarity protection as well as load dump ...
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43 views

Automotive reverse current and transient protection

Adding reverse polarity and reverse current protection to an automotive circuit seems a bit challenging, especially when driving loads in the 10A range (e.g. seat heater). Diodes on the power line ...
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3answers
55 views

CAN Bus Dominant and Recessive?

Why does CAN Bus represents signals with an inverted logic, high voltage for a logic 0 and low voltage for a logic 1? Is there any advantage in doing so?
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1answer
98 views

Is there a safe way to operate any type of a tesla coil on a functioning modern car (moving road vehicle)?

(Updated with clarifications) Could a tesla coil be safely built, installed and operated on an active road vehicle which is driving a regular city street? Let's say we want the discharges to be 20-...
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0answers
20 views

Automotive Load-dumps, ISO standards & Meaning behind datasheet

Im looking towards using an system basis IC for one of my designs (UJA1164A) and i noticed that under the features & benefits it notes that "Battery and CAN bus pins protected against ...
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1answer
40 views

Short to battery & short to ground

In automobile industry, while some of the sensor & valves were connected with electronic control unit, short to battery & short to ground test conditions are taken care against the loads. ...
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58 views

Can anyone help with designing a MOSFET load switch

Can anyone help me design a load switch using the Infeneon IPP120P04P4L p channel MOSFET and the necessary filter components? I would like to use the Texas Instruments ULN2803A darlington driver to ...
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1answer
62 views

Surge protector for car USB port

OK so the car manual says not to stick items into the car's USB port while starting the car. Like any good engineer(ing student) I tried to see what will happen if I did so, and am now the proud owner ...
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35 views

Compatibility and Interoperability Between CAN Standards

I'm intended to design a CAN system for a automotive scan tool. So, I need to comprise the main CAN standars used nowadays. Searching on the web I found the following options: ISO 11519-2:1994 – Low-...
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31 views

How does electric vehicle motors control, torque and speeds beyond base speed?

I'm currently trying to design a electric vehicle motor controller for a Permanent Magnet Synchronous Motor and simulate it using MATLAB. I have considered using the Field Oriented Control (FOC) ...
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49 views

Circuit design for bluetooth ESP32 in my truck

I've been working on this circuit for a few months now with lots of research. Looking for the gurus on here to analyze this board and give me some suggestions/corrections moving forward on parts/...
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2answers
72 views

Several positive wires, one negative?

I'll be fixing a motorcycle soon, trying to know if it's possible to have two or more positive wires (connected directly to the battery terminal) but only one negative. There is a usb converter AND ...
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2answers
142 views

Need a circuit to detect if something has gone from off-on or on-off

I'm new to circuit design but I'm trying to design a circuit for a power antenna that will send a 5 second pulse whenever it detects a a wire has gone from off-on or on-off. So far I have designed ...
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2answers
21 views

Combo Indicator LED / Fuel Pump Relay Kill Switch

I'm looking to wire up simple on/on DPDT switch in my car so that in one position, power is cut to the fuel pump relay and power is sent to a fake alarm LED, and in the other position the fuel relay ...
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1answer
60 views

Steering wheel controls with zener diode?

I am looking at my steering wheel schematics and trying to find what are these zener diode doing there? I want to be sure there's no problem feeding 5V from an Arduino to check the ADC values without ...
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29 views

Summing Audio Channels

I’m trying to sum my car stereo output. Factory output has bass on one output and mid and tweeter on another output giving me 2 channels for left and 2 channels for right. Ideally I’d like to sum ...
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1answer
51 views

How to find RPM from the square wave of a MSD box

I am trying to make a tachometer for my car. I am using a MSD6Al-2. The box outputs a 12 volt square wave at a 20 % duty cycle I talked to someone at MSD and they said you'll get a signal every time ...
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1answer
55 views

Approach to prevent Replay and spoofing attack on CAN protocol

I want to make an authentication system between 2 buses. In order to achieve that I use counter to avoid replay and hash to avoid spoof. The message must be sent in two phases. Is there any proper way ...
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1answer
34 views

How can I add a raspberry to a touchscreen car dvd unit? [closed]

I am working on converting a Toyota 2-din touch screen dvd stereo unit into a car computer. I would like to add a raspberry to it and be able to have the raspberry display a browser on the touch ...
0
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1answer
71 views

Automotive 3.3 volt supply that can survive engine start

I am powering a PIC32MX microchip using a 3.3V Linear Regulator (LM2937), supplied from an RBO40 which I fitted in an effort to protect against adverse conditions such as load dump. As an aside, I've ...
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1answer
37 views

15A 125V smart plug being used to slow charge electric car [closed]

So my car is using a charger that from what I'm told is both level 1 and level 2 capable. What I'm getting from the car is that its slowly drawing 8A continuously untill charged. The plug I have in ...
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0answers
74 views

How to power bulbs expecting 24V AC from a car's “cigarrete” socket?

I'm turning the trunk of my car into a UV-sanitizer chamber -- so that, by the time I return from the supermarket, the bags and the packages handled by strangers there are sterile. To this end I ...
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22 views

Charging Electric car battery from solar panels using PV cells and Zappi charger

In the UK there is an ev car charger made by myenergi which uses solar panels to charge your car. The link to the product is below https://myenergi.com/product/zappi/ This product allows you to ...
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1answer
32 views

Transient Voltage Suppression Diode with no current limiting component

BATT= 16V 27V Rated TVS Diode spec - TVS Diode Datasheet The circuit : My questions: I want to understand what happens when the BATT voltage goes above the TVS diode clamping voltage. For both ...
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2answers
39 views

Measuring a 2-pin active wheel speed sensor without having it connected to a vehicle

I'm trying to measure/test the square wave output of an active wheel speed sensor from a jeep wrangler for a project I'm working on. I do not have access to the actual vehicle just the sensor itself ...
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1answer
65 views

12V PWM to Analog DC converter for car cooling fan

I’m installing two 12V 80W cooling fans in an old BMW which originally uses a PWM electric fan. This original fan has a three pin connector (constant 12v, ground and PWM signal from the ECU). I ...
0
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1answer
59 views

Can I wire these automotive peltier heating/cooling devices as on/off without a temperature controller?

I have an seat removed from a Lincoln MKX that I mounted using scrap wood and heavy casters to use as an office chair that has power adjustment as well as Peltier heating/cooling components in the ...
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1answer
36 views

ISO 7637 Supply Transient pulses - Explanation

I am trying to design an input power supply filter circuit inorder to protect from ISO 7637 pulses. I am referring this Little fuse app note There seem to be different pulses. Pulse 1, 2a, 2b and so ...
2
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3answers
190 views

Why would one mount components above the PCB?

Inside of an automotive ECU I noticed that all three crystals are mounted about 1/4" above the PCB. What is the advantage of doing this versus mounting the case flush with the board? This seems like ...
2
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2answers
65 views

Thevenin Equivalence Problem

So I have this question that I'm struggling to understand and solve, it goes like this: I want to determine the Thevenin equivalent of my car battery. You measure a voltage of 12.2V across the ...
2
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3answers
121 views

Turning on an automotive relay when enough voltage is avaialble

I'm trying to drive a relay off a dome light in a car, where the dome light fades in smoothly. That is, say, I have a constant ground and the other wire goes from 0 to 12V (up to 14V) over a couple ...
2
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2answers
258 views

Why can one pour water on a car battery's terminals (12 Vdc) and not have shorting

When cleaning a standard 12 Vdc car battery's terminals, it's a common practice to pour a mixture of baking soda + hot water all over the terminals. The water can spread and effectively short out the ...
2
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3answers
509 views

Disconnect car battery with receiver [closed]

I have no clue what I'm doing but I want to prevent anything down the line of my car battery draining it, so I was thinking of somehow disconnecting everything down line while it is off. Pretty sure I ...

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