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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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3answers
28 views

Automotive Electrical Ground - Chassis

I am having some trouble understanding the ground connected to vehicle chassis in Automotive systems. I have read previous answers to understand why the ground is connected to vehicle chassis. I agree....
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0answers
26 views

Using an MCU plus an SoC like the TX2 to synchronize multiple CMOS Cameras

I have been looking at various options to obtain synchronized images from three or more cameras. The options available for the TX2 are just simply out of my price range. I accept that of course I ...
0
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0answers
31 views

Power Supply for automotive Circuit [on hold]

I want to create to my electronic circuit, which contains: An ublox GPS module, an ESP32 module, an angle and temperature sensor, a CAN tranceiver. A stable 3.3v power supply able to withstand bad ...
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0answers
44 views

Skoda Symphony AUX Input hack [closed]

I saw many DIY videos how to hack AUX input for different car stereos using an aux cable, soldered to the main board of the stereo and by playing a white noise through the CD player you can inject ...
2
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0answers
63 views

Filtering out everything below 12v on a car reverse light circuit

First of all I've like to mention that I'm by no means an electrical engineer. I'll try to explain what I mean with the title. I have installed a headunit which has an option for a reverse camera. ...
0
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1answer
119 views

Building a HV transformer

I built this circuit recently though it did not work for me https://www.instructables.com/id/Variable-voltage-ignition-coil-power-supply/ Using this coil https://www.autosurplus.com.au/brand/...
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1answer
50 views

Shut down engine when temp to high, oil pressure to low or RPM's too high

We do stationary dock testing on boats and would like to set up some safeties on the engine to shut it down. The engine is a 5.7L gm running a 12 volt system. We have done it in the past using a ...
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0answers
121 views

Transformer Welfare

I know this circuit is dangerous, but i made it anyway (probably a mistake)-https://www.instructables.com/id/Variable-voltage-ignition-coil-power-supply/ In my circuit, I used a small ignition coil ...
1
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2answers
55 views

How can I improve this digital-output / digital input (automotive)

I'm creating some circuits required in a student-built electric-vehicle application. There are no heavy loads on the low-voltage +12V system. What I have below is a circuit that does some threshold ...
0
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2answers
94 views

Can I use this analog switch for CAN bus signals?

In the deutsch 9 pin obd interface for heavy trucks, some manufacturers use the pin F,G for J1939 protocol and some use it for J1708 protocol. I am trying to use a NLAS4684 analog switch with dual ...
0
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2answers
46 views

12V Car headlight halogens vs. 240V mains golf balls (longevity)

The halogen headlights on my car must be about ten years old; I've never changed them and they put up with vibration, extremes of temperature etc. Yet the 40W mains ones in my house (normally dimmed) ...
1
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2answers
56 views

Tri State/Floating Signal Detection

I'm working on a project for automotive environment in which I need to read signals from the power mirrors switch in a microcontroller. The power mirrors switch controls the mirror's moving directions ...
0
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2answers
76 views

Can we implement physical DIP switches to route different differential signals?

I want to route two different CAN BUS signals (differential) to a CAN controller. Since the controller has only one CAN interface, I can not connect both differential CAN signals to the input of the ...
0
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1answer
21 views

CSR8645 3.2 bluetooth module audio output merge negative pins

I want to use this module with my car aux in which is has 3.5mm 3 pole jack. This module has separate negative pins as LN and RN. I need to merge and connect these pins to aux in common negative pin.
0
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0answers
35 views

Automotive High Side Switch vs. E-Fuse

I've been looking for a solution to provide solid-state overcurrent protection for automotive loads such as small water pumps (0.6A continuous), fans (3.5A continuous) and fuel pump (8A continuous). ...
0
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1answer
39 views

Convert select / trigger coils to direct fire

Working on ignition system controlled by prehistoric ECU, it has 2 signals: select and trigger. Select switches CoilA and CoilB. Trigger controls dwell time. I want to purge old broken coils and ...
0
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0answers
43 views

Motorcycle hazard light circuit design

My motorcycle has turn signals (2 on each side, front and back) with a switch to signal a left/right turn. I would like to add a hazard light switch to blink all four signals. I am here to ask whether ...
1
vote
1answer
46 views

Create circuit for 12v auto washer pump to 230v mains with push button for art installation

I am creating an interactive art installation in a gallery context using a 12 volts car headlight/windshield washer pump. It basically is a fluid washer pump taken outside of a car into a gallery, ...
1
vote
1answer
67 views

Automotive tachometer signal interpretation

I'm trying to build a custom dashboard for a car (Daewoo Lanos 1998 with Delco ECU). Tachometer signal, that comes to dashboard with a separate wire looks a bit strange to me. It seems that the signal ...
0
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0answers
26 views

Why does CCP require CRO/CRM messages to be 8 bytes?

In the CCP (CAN Calibration Protocol) V2.1 standard it is stated that CRO and CRM message objects must have a DLC of 8 even if they aren't used. What is the purpose for requiring these message objects ...
4
votes
1answer
154 views

Mimic a pick-up coil to drive a CDI ignition

I'm researching why an ignition coil passes ohm's testing but doesn't work. Installed on the vehicle and the engine doesn't run correctly. At first stages of bench testing and I'm still not finding ...
0
votes
1answer
78 views

Should I ground PCB to an aluminum enclosure when using in car?

I have been working on a bluetooth audio adapter for car, and I plan to put it in a metal enclosure when it is finished. The bluetooth adapter is very low power and I'm powering it directly from the ...
0
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1answer
83 views

What is an acceptable power dissipation in automotive wiring?

I am trying to figure out what a reasonable power dissipation would be in a 12V automotive wiring harness to determine my wire gauges. Is there any automotive standard that specifies what voltage ...
1
vote
1answer
76 views

Automotive IO electrical levels standard

Is there a standard that propose voltage/current thresholds for GPIO in automotive ECUs. Something that would define ViH, ViL, Iil, IiH, etc for 12V or 24V networks. I have good intuition of what is ...
0
votes
1answer
44 views

Controlling 12V 70A Motor(s) with Arduino MEGA (or NANO) and a 4-terminal automotive relay

Components I have: Relay (rated at 12V, 70A, cannot find how much current is needed to saturate its coils) Schematic Arduino MEGA and NANO 12V Powerwheels battery + AA battery packs Motor: 00968-...
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0answers
17 views

Clarification on AUTOSAR BswMLinScheduleIndication container

I didn't manage to understand content of AUTOSAR BswMLinScheduleIndication container. This container should configure mode request ports associated with BswM_LinSM_CurrentSchedule API function. The ...
0
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1answer
58 views

How do I size an isolation transformer I'm using to emulate a variable reluctance sensor?

I'm attempting to emulate a variable reluctance sensor on an engine. I know I need to produce a 600hz-6000hz zero-crossing +/-12volt waveform. The engine management controller's input measures 20okhm. ...
0
votes
1answer
28 views

12v Input LM2596 Step Down Module to USB 5.2V is Slow Charging

I am trying to use this regulator module (LM2596) to regulate my car's 12V power (constant from fuse port), and use the LM2596 output set to 5.2V to charge my phone (LG G6) but get the slow charging ...
0
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1answer
35 views

Limit in-rush current for DCDC

We are using a Isolated Fixed-Ratio DC-DC Converter from Vicor (http://www.vicorpower.com/documents/datasheets/ds_BCM4414xG0F4440yzz.pdf) that is powered through a 600VDC accumulator. The DCDC powers ...
1
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1answer
55 views

How to invert one channel of phone output?

I want to connect phone output to a car radio. It has + and - inputs. When I connect left channel to the + input, there is good quality sound, but it's not as loud as CD player. If I invert right ...
0
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1answer
31 views

How does an optimized car battery charging system could be designed?

To start, I saw a scooter electrics. In that implementation, after quite a weak (in my sense) generator it has some shunt linear regulator, that just dissipates overvoltage to heat. Oh god! Weak ...
1
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1answer
68 views

Help with wiring OEM LED turn signals that has 2 voltage inputs

The term AFS is used in the 2nd diagram to help differentiate between the bulb type turn signals vs the led type. I'm trying to swap my headlights(without-AFS) to a higher trim version(AFS) on my ...
0
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1answer
55 views

Diode direction for Door Pin Trigger

Which direction should the diode, cathode or anode, be facing for a car security alarm wire? Below is a diagram. When the doors are closed, the wires are testing at 10.1 Volts, settings on the ...
0
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2answers
100 views

Cannot jump-start car directly when I disconnect the dead battery

So I have a car B with a dead battery and a good functioning car A. I remove the dead battery from B and connect the terminal directly to car A's battery terminals. I cannot start car B. I tried to ...
0
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2answers
71 views

When jumpstarting a car, why do I need to wait a bit for the bad battery to charge a bit?

So I have a car A with dead battery but good everything else and a car B with good battery. What I did was disconnect car A's dead battery, connect car A's terminals directly to car B's battery. When ...
0
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1answer
70 views

Galvanic Isolation in Automotive Environment

I am using a linear regulator (MIC29302WU) to power a computer mounted inside my car; however, there is significant noise being passed along the ground of the regulator to the main computer. I ...
0
votes
1answer
39 views

MCP2561/2562 CANbus voltage?

The datasheet says the MCP2561/MCP2562 is suitable for 12V and 24V systems except that everywhere I look in the datasheet it says VDD needs to be between 4.5 to 5V. How can CANH be greater than VDD or ...
1
vote
1answer
102 views

Switch a 12 VDC circuit from a 0.6 volt signal

I need to switch a 12 VDC circuit (automotive ignition coil) with a .6vdc signal from an impulse coil. I am trying to replace the ignitor box for this engine; they are extraordinarily expensive and ...
0
votes
2answers
40 views

How to connect a device to ground using negative signal with high impedance

simulate this circuit – Schematic created using CircuitLab I have a device that enables a ground connection when I press a key on a remote control. This negative signal used to control other ...
3
votes
4answers
132 views

Motorbike turn-signal blinker starts OFF, I want it start ON

I bought a cheap blinker that claims to be good for LED bulbs (so the frequency is independent of the load.) It is true, but it has a flaw: the lamps go ON only after about a half second from when I ...
-1
votes
1answer
39 views

Circuit to supply stable 12vdc from an automotive battery to opamp rails

I've created an Automotive IO board that has digital inputs, digital outputs, analog inputs and analog outputs. Onboard I have an automotive grade regulator to convert the dirty 12vdc to a clean 3.3v ...
1
vote
1answer
125 views

High current, high frequency IC PWM switching with MOSFETs

I'm designing a circuit for an automotive application (chassis ground) that has a number of MOSFET outputs to drive large LED arrays and smaller motors (application tends to favour non inductive modes,...
3
votes
1answer
126 views

What type of crimp terminals are these?

In my vehicle, I have a 27-pin connector with Volkswagen OEM part number 8K0 972 701 (male) / 8K0 972 702 (female). Etched onto it is the TE Connectivity logo and the number 1718872-1. I am looking ...
0
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0answers
44 views

ADC Measurement on Automotive Circuit with Arm MCU

I'm trying to develop a circuit capable of measuring voltage on 6 different automotive pins at 12V nominal. I'm hoping to use the integrated SAADC in the nRF52832. I've done some research into ...
0
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2answers
104 views

Post build flashing of configuration data in embedded systems

I need to implement a mechanism by which I should be able to update the configuration data of some of the modules in a post-build fashion. To describe, consider I have the following files: ...
0
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1answer
95 views

How to remove flickering on car-powered LEDs?

I am powering an array of LED lights via the car alternator (the LEDs are connected to the car battery leads, but only run when the engine is on). The problem with this setup is that the natural ...
1
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2answers
648 views

What is the lowest voltage a 12V lead-acid battery in a car could be?

I'm trying to design a product that is powered from the 12V rail inside the car. In normal driving (engine running, electronics on etc.), what would be the minimum voltage of a low battery? Reading ...
4
votes
3answers
166 views

Why are “devices utilized exclusively in any transportation vehicle” exempted from FCC compliance testing?

I was researching whether do we need to do FCC compliance testing for a device we developed for a client. Curiously, it seems to be in the list of exemptions (passage taken from here): A digital ...
1
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1answer
52 views

Looking for a connector with only images to go on

I'm trying to find the connector used for my vehicle's accelerator pedal. Are there any strategies for finding connectors like this?
3
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2answers
379 views

What happens in the secondary winding if there's no spark plug connected?

The circuit below (minus the transformer and SCR) is used to detect the existence of a flame using the concept of flame rectification. Based on the circuit here: Pilot Light Flame Sensor I have ...