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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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Controlling a device in a car using a button and ignition

I need to connect a device to my car. I thought about using an XOR gate because: A - button B - car ignition. If the car's ignition is off (0), pressing the button (1) will turn on the device (1). If ...
jminhal's user avatar
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-4 votes
0 answers
53 views

Ways to Design Automotive Sensors from scratch? [closed]

I have joined a Automotive Sensor Development Team. Can anyone explain me the ways to design and develope a automotive sensor from scratch to finish. Eg.: HV Current Sensor.
user131517's user avatar
0 votes
1 answer
49 views

Automotive 12 V relay setup with push button switch and multiple devices

Need help with a 12 V Automotive application project. 2 electric motors 1 electric latch/lock assembly 2 push button switch I built a custom storage compartment with electric motor to automatically ...
A B's user avatar
  • 1
4 votes
1 answer
205 views

What is the best way to retrofit a connection between a circuit board and its case (housing)?

This is a very specific well defined question, imho, but it's also likely to be that I can do anything better. This strikes me as amazingly bad engineering. Hondas and Accuras all have a problem with ...
Evan Carroll's user avatar
-3 votes
1 answer
85 views

How a car inverter can diffuse 16 A 230 V if the input is a 12 V car battery? [closed]

I have found this car inverter We say that the power is kept between the input and the output of an inverter like in this thread, so if the voltage in the output is higher and stepped up, the current ...
John Mary's user avatar
0 votes
1 answer
35 views

Temperature Sensor Auto

I'm trying to make a temperature sensor for a Golf MK2, with an LM3914N to light an LED bar with 10 LEDs and in the signal I'm using a voltage divider for R2 to be the temperature sensor that operates ...
Joel Pedrosa's user avatar
0 votes
3 answers
84 views

Car button - Switch current impulse to relay

I will add momentary push button to car infotainment panel (instead of blank). It's VW/Audi original button which I want to use to switch relay (ys-rt1c - Timer delay turn off) to supply 12 V for rear ...
Jason's user avatar
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0 answers
49 views

How do I convert an I2S/TDM signal to a CAN signal

I'm getting output from the Analog Devices ADXL317 and I want to convert the output signal to a CAN signal. I don't think many CAN transceivers can take input from the I2S bus, so I need to find ...
Skop's user avatar
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0 votes
1 answer
43 views

Bulletproof automotive drycontact input switch with constant current opto driver

Please comment on this circuit. I want to make sure a push button input SW? is as robust as possible before it goes into my processor after the U12A buffer.
Pieter Potgieter's user avatar
0 votes
0 answers
36 views

Is a Voltage Sensitive Relay (VSR) inherently flawed?

A VSR is described by Jaycar: This device will allow two batteries to be charged from your engine alternator at the same time. When your engine is on and the start battery is sufficiently charged the ...
Ken Mercer's user avatar
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0 answers
70 views

How does CAN transceivers output CANH=3.5V and CANL=1.5V? [duplicate]

This is a questions that has been asked but did not find a clear answer. How it is the 3.5V achieved on CAN_H? Assuming there is 0.5V voltage drop on the internal diode, 0.1V on the internal MOSFET ...
Florin Adrian's user avatar
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0 answers
32 views

Power selector for 12V car battery and Li-Ion

I am currently using the following power selector circuit (based on this Microchip app note) to switch between a 5V (5V5A) supply and a Li-Ion 3.7V battery (...
Dan Alvarez's user avatar
1 vote
0 answers
47 views

Car side-mirror dimmer simulator circuit - DIY

Would like to make a simple car side-mirror simulator circuit. The side mirrors I installed (for better blind spot) do not have a dimmer circuit and I am getting LIN bus errors since the dimmer wires ...
fe7565's user avatar
  • 11
2 votes
1 answer
75 views

What does back-back mean in the context of TVS diodes?

I am making the schematic of a 24 V power supply regulator using the LM74900-Q1 IC. When selecting the TVS diodes, I found the following design suggestion in the datasheet of another IC (LM74800-Q1) ...
Luis J. Mora's user avatar
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0 answers
17 views

Standards/Insight into Transient Protection of Industrial/Construction Equipment

I am designing a device that will be connected to the 12 or 24V battery of certain construction and industrial equipment. I'm aware that because these are industrial vehicles/equipment we will need ...
Andy M's user avatar
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1 vote
1 answer
128 views

What are sources of extra low frequency magnetic field in a car with IC engine? [closed]

ELF analyser (16 Hz - 2 kHz) shows a magnetic field around 300- 2000 nT (at some position exceeding that) in car when petrol or diesel engine work. When RPM increase from idle to 2500 RPM, magnetic ...
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1 answer
60 views

Is a buck-boost converter good enough as circuit protection for an automotive application?

I am designing a circuit for a automotive application that requires a stable regulated 12V supply. The supply in turn must be powered by an automotive battery. I am currently looking at using a ...
Jayson Okhman's user avatar
0 votes
0 answers
23 views

Does a buck-boost converter serve as enough circuit protection for an automotive application? [duplicate]

I am designing a circuit for a automotive application which is meant to map voltage ranges between two airflow sensors (i.e. 1 sensor has an output range of 1.75-7.0V and I want to replace it with a ...
Jayson Okhman's user avatar
0 votes
1 answer
64 views

What circuit protection devices are needed for an automotive application? [closed]

I am designing a circuit for a automotive application which is meant to map voltage ranges between two sensors (ex. 1 sensor has an output range of 0-5V while the other has a output range of 1.75-7.0V)...
Jayson Okhman's user avatar
1 vote
1 answer
112 views

Is a high-amp car alternator three phase or single phase power? (12 V, 150 A machine)

I am in mechanical engineering, and have only worked with three-phase power. I modeled a 12V, 150A car alternator as a three-phase electrical machine simply based on when I look up what most ...
Celaena Sardothien's user avatar
0 votes
0 answers
31 views

Programming ELM327 PIC18

I have (second hand) a modified ELM327 with 18F25K80 and a FT232, seems has been modified to be programable via USB has a jumper wire from pin 3 (reset) from FT to pin 1 (mclr) 18F, swap quartz and a ...
Rewite's user avatar
  • 1
1 vote
0 answers
80 views

Debugging CAN bus

My Ford S-Max 2014 seems to have issues with the CAN bus, and refuses to start. When hooked up to Fords own diagnostic tools, it complains that the engine ECU doesn't reply. The ECU gets power, and ...
Eli Kaufman's user avatar
1 vote
2 answers
95 views

Switching battery bank between 12 V and 24 V

Looking to add a couple of 12 V batteries to a camper. Everything (plus charging) runs off 12 V except a 700 W stove which runs off 24 V which I'd like to be able to run for short periods. The cost of ...
Tom's user avatar
  • 11
0 votes
1 answer
42 views

Resistors for a Solid State Relay

I have a controller output fused at 250 mA, and I need to use that output to switch a 1.5 A load. Everything is 12 VDC in the vehicle. Figured I'd be using a solid state relay. Do I need to be worried ...
CragMonkey's user avatar
0 votes
0 answers
45 views

Obtaining analog video from car LVDS interface theoretical question

Got a theoretical question. A car has 4(5 with GND) pin FAKRA connector between head unit (NAC) and head display. 2 of them are mentioned as LVDS+ and LVDS-. As far as I understand, it's 2-way gigabit ...
Alex Smirnoff's user avatar
0 votes
1 answer
44 views

Raspberry PI powered via USB A in car when using ODB2 Port [closed]

I'm running a Rasberry PI 4 in my car to read values from the ODB2 Port. Below is the diagram of my setup. The PI is powered via the Cigarette Port using a 12v to USB charger that has an On/Off ...
Gee1983's user avatar
0 votes
2 answers
97 views

How do I use a pull-up resistor to trigger a relay?

I have a 12v automotive electrical system that has a pressure switch that switches at 40psi. It is normally closed to ground (low pressure), and goes open when switched (high pressure). The switch ...
Chris S's user avatar
1 vote
0 answers
118 views

What’s this PCB that interfaces with the USB CarPlay connector of the Ioniq 5 / EV6? [closed]

As with several owners of the Hyundai Ioniq 5 and the Kia EV6, I’ve been having intermittent issues with the USB CarPlay functionality. It worked fine when the car was new, but after a few months the ...
Honeycomb's user avatar
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0 answers
101 views

Designing support for BT in a car's audio system

We are designing a pre-amplifier outputting I2S and need to stream this to a car's audio system via Bluetooth. We have tried a module from TinySine, but it turned out it can only connect to headphones....
Max Kielland's user avatar
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0 answers
96 views

Need help with PTC heater EDITED

simulate this circuit – Schematic created using CircuitLab Figure 1. CircuitLab schematic by @Transistor for OP to edit. I have built a heater from a PTC heater with a couple of fans on top and ...
makkkis's user avatar
0 votes
1 answer
116 views

Making a USB connection over WIFI [closed]

I have been using wired Carplay/Android Auto in my car. I checked a few existing wireless auto solutions and realised the present solution has a complete system inside to handle the connection. This ...
Raj Rohit Yadav's user avatar
1 vote
4 answers
96 views

Usability of COB LED filaments as replacement for traditional filaments

COB LED filament household lightbulbs are a thing now. Can someone explain to me what limitations there are to using these COB filaments in car headlights? They emit a very similar light pattern if ...
Dan's user avatar
  • 13
0 votes
1 answer
67 views

How are DC fast (rapid) chargers able to charge different chemistries?

As far as I know different chemistry batteries require different stages of charging. How are DC fast chargers able to charge any battery chemistry? Furthermore, there are the 400V and 800V standard ...
php_nub_qq's user avatar
0 votes
0 answers
39 views

Two motor controllers in parallel

Can I, when connecting two inverters (motor controllers) in parallel, control each current independetly? Also is it possible to charge a battery trough a inverter (motor controller) with both inverter ...
Gabriel Sampaio's user avatar
2 votes
2 answers
1k views

How much charging voltage can a lead-acid car battery handle?

I'm looking to make a car battery charger for learning purposes. I have read through this this post and this post. While I am still confused about certain things, it seems generally agreed upon that a ...
TrisT's user avatar
  • 355
0 votes
1 answer
80 views

Could a Mercedes sedan powered by 9,648 AA batteries reach 52 mph?

Saturday Night Live's hilarious Mercedes AA Class skit (non-US link) showcases a Mercedes luxury sedan supposedly powered entirely by AA batteries: But, as an engineer, I can only ask: would a car ...
lambshaanxy's user avatar
1 vote
1 answer
127 views

Are 24/12 V automotive ECUs 3.3 V under the hood?

My understanding is that MCUs (especially 32 bit ones) typically operate at 3.3 V. I have a 24/12 V, 32 bit automotive ECU (Bosch Rexroth Series 40). I've provided them as an example, but I'm asking ...
Max F's user avatar
  • 13
0 votes
1 answer
62 views

Non-inverting driver for LED

I am looking for a non-inverting LED driver. The main idea is to connect 20 x LEDs (4 series of 5 LEDs each) to 12V source (car battery: car is running so there will be some interferences -> I use ...
SkePsis's user avatar
  • 67
0 votes
0 answers
91 views

How to eliminate relay buzzing when turning on and off

I'm using one of these relays to power some LED's using a trigger wire that outputs either 0V, 50mV, or 12V. The relay has a low voltage trigger setting that turns on when there is anything less than ...
GoleeMD's user avatar
  • 51
0 votes
0 answers
85 views

Trying to power a 12 V LED underglow system using PWM signal from dome light

I've learned a lot from the brilliant minds on this forum so far, and I think I've narrowed my original question a bit. I'm trying to create an entry light effect in my car using my LED underglow ...
GoleeMD's user avatar
  • 51
1 vote
0 answers
63 views

Measuring 12V car battery voltage precisely from the output of an ideal diode controller

I'm designing a device that will be plugged into the OBD2-port. One of the features is reading the battery voltage on demand directly from the diagnostics port. In order to protect the device from a ...
AlectronicZ's user avatar
3 votes
1 answer
331 views

12v LED lights powered by 2 different circuits

I am wiring some automotive LED lights (underglow), and currently have them wired from the 12v ACC power (on when ignition is on), with a 5-pin illuminated on/off rocker switch on the dash. It works ...
GoleeMD's user avatar
  • 51
1 vote
0 answers
103 views

What kind/type of connector is this?

What is the name/type of this window switch connector? It is from a 2012 Tesla Model S but I believe it is made by Mercedes Benz. I have looked all over the internet and can not find a connector that ...
mj662's user avatar
  • 19
0 votes
1 answer
97 views

GoKart brake/flashers with 5-pin relay help

I mistakenly bought 4-pin relays but think I may need a 5-pin relay for what I'm trying to do. I bought a set of brake and turn LED's. The intended operations is: Key on, yellow turn signals. Hit ...
Travis's user avatar
  • 103
11 votes
4 answers
2k views

Does a diode flyback protection decrease the life of the relay?

I am currently making an automotive circuit that controls some automotive accessories (personal project not for production). In my circuit, I will be controlling some automotive relays and in any ...
DrakeJest's user avatar
  • 917
0 votes
0 answers
45 views

Inverting MOSFET drive circuit, is my scheme correct? [duplicate]

I am an automotive engineer student, building an inverting MOSFET driver (where a MOSFET drives and controls another MOSFET, Vin low -> Main MOSFET closed, Vin high -> Main MOSFET open). My ...
Duy Nguyen's user avatar
1 vote
0 answers
62 views

Automotive EPB switch design - why so complex?

The Land Rover Discovery 3 has an electric parking brake (EPB) - a geared motor and cable assembly that pulls the park brake pads in. This is far more effective than purely mechanical levers of old ...
Ben L's user avatar
  • 11
7 votes
2 answers
659 views

Should RVs electrical system be grounded to chassis?

I have an RV with both 12V and 230V systems. The 12V uses internal battery, while 230V is supplied from outside via plug. Should I connect these systems to metal frame of vehicle (minus of 12V or ...
Ri Di's user avatar
  • 1,039
1 vote
1 answer
76 views

Looking for datasheet of Toshiba T2742 integrated circuit [closed]

I'm looking for datasheet for Toshiba T2742 Integrated circuit. IC is used in old car with tachometer sensor, probably as AFE (Analog Front End). Tachometer sensor is a inductance proximity sensor, ...
pio's user avatar
  • 11
-1 votes
2 answers
430 views

How can I power two headlights using a single 12-Volt wire?

I have read where people try to power multiple 12v devices on here with one PSU, but nothing like this, and I have no idea if it carries over to this particular case. I am interested because, from the ...
Noah 's user avatar
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