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Questions tagged [automotive]

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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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First off, I'm aware that this might not be the best place to post this question but I'm not sure where else to take it. So here goes. I recently bought a Quadlock wireless charger. It comes with a ...
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In an automotive, under dash environment, if I use a Y-adapter at the OBD-II factory port (to share the bus with a CAN controller while keeping the factory port functional), is it acceptable for the ...
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I’m building a CAN bus interface for automotive use, connecting from the OBD-II port (under the dash) to a remote enclosure containing an ESP32 + MCP2515 module, with a total cable length of ~12 feet (...
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MCP2515 Placement: Near OBD-II or at MCU? I’m building a CAN bus interface for automotive use, connecting from the OBD-II port (under the dash) to a remote enclosure containing an ESP32 + MCP2515 ...
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In a typical automotive environment (under-dash, near ECU wiring), is shielded twisted pair necessary, recommended, or optional for reliable CAN communication at 500 kbps?
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I am VERY new to electronics, but I love this world. My first project is to read CAN bus data from my 2008 Ford Taurus. I got a MCP2515 CAN Bus Module with a TJA1050 Receiver, and an Arduino. I hooked ...
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It's obvious that a short-to-ground will happen when a car battery's positive has a path to the negative terminal, which is typically through a car's body. But, if the negative terminal of the battery ...
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I don't know if this is the correct place to post this question, but... I have some plans to use devices inside a car, powered by rechargeable 18650 batteries. And yes, I heard it's dangerous, risky ...
Panamanian's user avatar
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I am working on a circuit that uses a PC817 (or LTV-847 for multiple channels) as an input stage for my microcontroller (via MCP23017). The installation is in an automobile, and the input comes from a ...
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Im trying to understand key fobs a bit better and to my knowledge there are systems which utilize 2 frequencies (LF and UHF) https://en.wikipedia.org/wiki/Smart_key#Keyless_Go. The key fob receives ...
user2276094's user avatar
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I am referencing the above circuit. I want to make a higher amp version of this and feel I have a good grasp on what current values I need for the components in series to the power source and ...
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Car wiring specific question. I'm doing a wiring conversion on an older car using newer car's wiring loom and some of the logic is not identical. Need help solving two issues: I have a button that ...
Max399's user avatar
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I am relatively new to automotive power protection circuits and I am designing a solid state switching panel for my father in law for christmas to go on his drag truck. This product will just have ...
Matt's user avatar
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I broke the volume button encoder in my VW Caddy III (2016). It is from a radio unit RCN210.It's a mechanical rotary encoder a push-button. I can't find its part number, only thing that is written on ...
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I'm fairly new to electronics, though I have a basic understanding of simple circuits. I'm trying to hook up a hazard light switch with a relay on my motorcycle (12V system) as a DIY project. The ...
Knight King's user avatar
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I am trying to read a radio code from a retro Clarion car head unit. I have located the EEPROM the code is stored in, a 93C46 EEPROM (Also marked 64ag TEM8). I have measured the IC in board to work ...
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I am talking about the device that is mounted inside the vehicle and sits between the generator and the battery & the rest of the circuit, not an external charger. It takes the AC from the ...
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I have a 30 year old car radio which is being fed with a noisy +12v rail, with engine RPM dependant whine being heard through the speakers, and visible on a scope in FFT mode as a peak from 2-5kHz in ...
S.Stevens's user avatar
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I have been trying to trace engine noise being picked up by what is a faulty car head unit. I know it is the head unit itself as when trying a different unit, the noise disappears. I attempted to use ...
S.Stevens's user avatar
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I am implementing Pi5 in an automotive environment and was surprised to find limited development on this topic, even with my specific requirements, which I thought were relatively basic: Pi needs to ...
Joseph M's user avatar
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2 answers
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On certain Ford vehicles, the Gateway Module (GWM) has what they call an "Ethernet Master Connector", that connects 5 independent Single Pair Ethernet/1000BASE-T1 cables together. I have ...
JJTech's user avatar
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I'm working on replacing the old analog dashboard in my car with a new custom one based on an ESP32. The original dashboard used standard 12V bulbs (e.g. for headlights, high beam, oil pressure, turn ...
Will Buckneer's user avatar
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I am using a 12v relay module to make a trailer light connection for a car. I am taking the 12v feed from the lights that, when on, active a relay on the module board which then activates the lights ...
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As per the Radar - range equation Now, For a SNR vs Range analysis I am interested in , I wished to know the value of B or Noise Bandwidth for the Texas Instrument AWR1843 automotive radar. Already ...
Ayush Shukla's user avatar
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I thought I'd ask this here as I want to know the reasoning for this design choice in terms of electrical engineering and safety. Rest assured this is NOT a question about practical installation. SPDT ...
AC headlight's user avatar
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I have added an aftermarket BT module to my car (Mercedes W211). The car has a factory hands-free calling system, and I would like to use the factory mic with the aftermarket module. There are several ...
Ábel Ivicz's user avatar
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2 votes
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I've been trying to solve one task of mine, but didn't succeed, and thought I need a help of people who know what they are doing. I have: Two lamps - lamp 1 (20 W) and lamp 2 (5 W); Two voltage souces ...
WINDOGE 8's user avatar
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The part number for the CAT starter is 435-1240. Now, for the source of my confusion: When I remove the jumper, located between solenoid's MTR terminal and stator windings terminal, the solenoid, ...
Magg'rath the Flesh Spinner's user avatar
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When extending a CAN bus network that has the speed of 500 kbit/s with additional 15m length with 120-ohm terminators: Is using a dedicated 120-ohm CAN bus cable essential for minimizing ...
Shamooooot's user avatar
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In a car audio amplifier I noticed that there is a DC ground as well as AC ground. Why is it that the AC ground is taken from the torroidal transformer, is it not that the AC ground reference voltage ...
aizen_gops's user avatar
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I have two spare automotive lambda O2 sensors... They have four wires, two for heating PWM, one for analog signal from 0V to 1V and one for ground. Can I use them to measure oxygen on room vents? I ...
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I have been having some issues integrating a new motor controller with an Axial Flux Brushless PM Motor. Our new motor controller has three modes of operation 6-step, vector control, and sensorless. ...
Jake's user avatar
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I am using the Texas Instruments encoder built into the motor Teknic_M2310PLN04K but there are some things I don't understand: Is the encoder incremental or absolute? In the motor code, the final ...
KaleM's user avatar
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First post here and just putting it out there from the start, I am no expert in electronics. Looking for some guidance on putting together a small temperature controller for an EV vehicle conversion. ...
Losduos's user avatar
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So the immediate answer that came to be was obviously not, but let me tell you why I think it might be feasible and even preferable. By trade I am a mechanic but personally I forget whatever I know ...
Connor Lightbody's user avatar
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2 votes
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I'm trying to make a circuit in my car that emulates a CD/MD changer device to the radio so these can be chosen as audio source and switched to. Everything works great, but one problem is that the ...
Arrrow's user avatar
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2 answers
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I have this 12V car fan and I am supposed to use it to control the temperature of a fuel cell stack with PID logic. I am using a STM32 to do so. The proposed solution looked something like this: I ...
Gabriel Sampaio's user avatar
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I need input on a dual-control relay circuit for automotive headlights. The relay configuration is as follows: Terminal 86 is connected to +12V, and I want to control the relay using two separate low-...
mehmachine's user avatar
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I have a solenoid that controls opening a vacuum actuated exhaust. I have a button that is momentary and sends a voltage that I would like to use with a relay to send power to solenoid to open the ...
davefester's user avatar
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2 votes
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Most sources online state that a truck alternator (24 V system) has an output voltage of 27.6-28.8 V. All of the 24 V axial fan options I can find on Mouser/Digikey state a max input voltage of 27.6 V....
Jake's user avatar
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This is a heating foil from the side mirror of a car and is supposed to melt ice on the mirror on a cold day. It seems to be broken (significantly less power compared to the other mirror) but the ...
jp-jee's user avatar
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I am making a car stereo which has two inputs: A 3.5mm connector and bluetooth. The bluetooth signal is converted to analog using PCM5102 which output is 2.1Vrms. The purpose of the summing amplifier ...
sweg's user avatar
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I am designing an Automated Guided Vehicle (AGV) and plan to incorporate GPS navigation. As an automotive engineering student, I am not familiar with using the Pixhawk controller, which is typically ...
Abdul Baseer Abbasi's user avatar
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4 votes
1 answer
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I work on cars and we have had many cases of a fault with HV precharging time. We are instructed to deactivate the HV system and perform a resistance measurement between HV positive and HV negative on ...
Sd313's user avatar
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As per my question, an old vehicle I'm working on only has a 24V supply system (2x12V batteries connected in series). I was also hoping to implement an aftermarket central locking system too however ...
user461193's user avatar
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3 votes
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I have read some threads here and elsewhere about how to read what current range the multimeter might be displaying when a rotary switch has 10, 200m, 20m, 2m selections. In the picture below i have a ...
Ilkkae's user avatar
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I have a simple circuit setup with an N channel MOSFET switching ground to a two pin ignition coil. I am not getting any spark from the spark plug in the coil. Could someone take a look at the ...
Ramin Ansary's user avatar
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1 vote
2 answers
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I need to convert a signal indicating whether my vehicle's engine is running. Thus, the environment is about 12V DC, the “about” in anticipation of low battery, or running dynamo. The car provides me ...
stefan's user avatar
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8 votes
7 answers
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Good quality starter cables are expensive. That's a fact, no way around it. I want to keep some in my trunk for emergencies. I looked around and saw some rated for 600 A and 1200 A. Why can't I make ...
m gold's user avatar
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I’m working on an STM32F103 microcontroller (3.3V logic) and need to drive 5V PWM signals for BLDC fans at 50kHz. I’m looking for a reliable and cost-effective solution to level shift the 3.3V PWM to ...
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