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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387 views

Selecting Appropriate TVS Diode for protection against Load Dump

I am working on Bike Flashing lights. I have used 7805 as the regulator to supply +5V to the controller, also have 1N4007 in series at the input with capacitors. I don't want to add any expensive ...
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342 views

Help needed with over discharge circuit on LifePo4 12V car battery replacement

I'm putting together a LifePo4 battery pack with the intention of replacing the 12V lead acid battery in my 4WD. So far, what I've got is the following. 4 x 10 Ah LifePo4 batteries (38120 Headway) in ...
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1answer
83 views

Car adapters (12V -> 5V) in parallel

Am wondering if there are any risks involved in putting two (5V) car cigarette lighter adapters in parallel. They will be part of a setup replacing the car stereo, so will be connected to the "...
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1answer
66 views

Car subwoofer wiring [closed]

Im not much of an audiophile or audio technician and Im pretty much ok with the sound my car has, except the low frequency output. I don't want to mess up with wiring and speakers or change the head ...
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1answer
1k views

CDI ignition: Isn't the coil charged anyway?

I'm trying to understand how the CDI (capacitor discharge ignition) works and what are its advantages over inductor-based systems. The disadvantage of the inductor-based system is apparently that it ...
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1answer
224 views

Designing custom LED bar as a replacement for standard headlight [closed]

I own an Opel/Vauxhall/Holden astra produced in 2000. Currently it is fitted with standard halogen headlights, however I am looking to improve the looks of the car by customizing the headlights. I am ...
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809 views

How to create a J1939 ID that have a PGN = 0x130?

I'm trying to create a J1939 message with a PGN equal to 130. But I couldn't determine how the ID is going to look like in order to get that exact PGN. Can you please share a suggestion? Thanks a ...
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2answers
90 views

AUTOSAR clarification about the data type

I have seen the following typedef the link of the document isAUTOSAR CAN NM He refers to the term container and mapped to the data type CanNm_ConfigType. what does the term container mean? So ...
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1answer
290 views

Interfacing with a truck's internal CAN bus system

I'm currently exploring different ways by which I can communicate with a truck's internal CAN bus system and would like some advice on the most appropriate solution for me. I have overviewed the CAN ...
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1answer
368 views

Implementation of an AUTOSAR NM sequence diagram

I am planning to implement the CAN NM as per the above sequence diagram. My understanding of the diagram is as follows. A Message Cycle Timer will be running continuously which is a configurable ...
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3answers
128 views

Wide Voltage Automotive Status To Microcontroller Input

I need to monitor the status of a wire in an automotive application that can have 10-40VDC on it at any time. What is a good approach to limit the voltage to a microcontroller input across such a wide ...
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112 views

Automotive voltage specifications

I've been tasked with designing a circuit (actually a buck/boost converter outputting 20 Volts at up to 10 Amps) which takes "automotive voltage". This product will be subject to some sort of ...
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1answer
254 views

What are the functions of the diodes in this BLDC controller circuit?

I'm trying to understand the function of the diodes in this snippet of an automotive BLDC controller. I believe that D102 is for over-voltage protection, and reverse polarity protection. Also, I ...
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1answer
69 views

What is the difference between Manufacturing/Design process of CMOS IC for Automotive Grade 1 and Grade 2

I see various CMOS IC in the same datasheet has Automotive Grade 1 [125 deg.C] and Grade 2 [105 deg. C] part numbers. Can you explain what are the possible manufacturing or design differences between ...
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3answers
1k views

capacitor ground or not?

I recently started developing an interest for electronics (doing mods for my car, Delayed lights etc...) so I decided to sign up here. I have some questions about capacitors (which are very new to me)...
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6answers
8k views

Why aren't starter circuits protected?

In most cars and trucks, a thick cable connects the battery directly to the starter (solenoid). Why don't these circuits have have any kind of overcurrent protection? It is an accepted practice ...
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2answers
763 views

High frequency p-channel mosfet pwm dimmer problem

The circuit below is the final one, after all the advice from Mishyoshi and especially Andy aka. It includes Zener diode protection against over-voltage between gate and source on the Mos-fets and ...
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1answer
352 views

Vibration sensor switch for Car

I am building a small GPS tracker for my car using a Raspberry PI Zero plus some additional components. I would like to keep it off unless the car is turned on or it's moved forcefully. To do that I ...
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2answers
55 views

Detection of condensation on automotive glass

Wondering if anyone has done this or can add to my theory, my idea is to use a microcontroller to measure the resistance of a heated car windscreen using the pre-existing copper conductors to detect ...
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1answer
262 views

Additional overvoltage protection after RBO 40-40 with Zener diode

I have an automotive application where I have this: simulate this circuit – Schematic created using CircuitLab Would the 20V 1W or 5W zener diode be enough together with a typical automotive ...
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6answers
6k views

How can the contact points of jumper cables handle the hundreds of amps required to start a car?

When jumpstarting a car, you connect those big alligator clamps to the terminals of the batteries. The cables themselves can handle the current just fine, but the contact points between the alligator ...
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2answers
187 views

LM2576 in car environment

I have a LCD driver board and it uses LM2576 for voltage regulation/step-down. As being cheap ebay/aliexpress purchase the instructions state 12V DC input without specifying range. Datasheets I found ...
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3answers
89 views

Battery size for street musician gear [closed]

I am a musician and we are taking our show to the streets, away from wall sockets. For this, we will be using a 300W inverter that I have lying around, with a car battery of some size {?} We have: ...
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1answer
420 views

Car blinker setup, turning off parking lights when blinker signal is high [closed]

I have a basic idea of how to do this, but I could use some help. Not sure what transistors to buy. LED is less than 5 watts. Voltage may fluctuate 12v-14v. I came up with this circuit. Input from ...
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1answer
568 views

Ion-current sensing in ignition coils

Variety of IC engine manufacturers have eliminated acoustic knock sensors from recent designs. Those got replaced with Ion current sensing circuitry (feedback from the spark-plug). In parallel, SMART ...
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3answers
156 views

Automotive Battery Disconnecting Safety

As an emergency responder we learn how to cut open cars and extricate injured or trapped people. As a part of that, we are taught to always cut the battery cables to prevent stray current flow. My ...
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0answers
333 views

Power transistor identification: Philips ON503

I'm trying to find information on a power transistor used on a 1978 automotive ECU. Having reverse-engineered the circuit, I'm fairly certain that it's a NPN transistor, but I've found some references ...
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5answers
385 views

How can I protect a 12VDC power source from high-resistance shorts? [closed]

I have a pickup truck with a 3kw AIMS inverter-charger. It is wired with 4/0 welding cable (for both positive and dedicated neutral back to the alternator), and I installed a block with a 300A fuse in ...
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2answers
843 views

How to protect a DC Motor from stalling

There is a electric motor butterfly valve that opens and closes by putting 12v on the motor to open the valve. Reverse the polarity and it closes. This is the motor and valve in question I can see ...
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1answer
3k views

Measuring and conditioning ignition coil secondary signal

I would like to measure and log the ignition advance timing angle of a vintage (70s) car. That is, mechanical distributor points (Kettering system), no electronic ignition, no RPM sensor. For this, ...
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1answer
534 views

Interfacing TDC sensor (inductive pickup) to a microcontroller

I'm trying to do some diagnostics on a classic car (aircooled VW). In particular, I'd like to monitor a signal that flags the TDC (Top Dead Center) on every engine revolution. The signal is available ...
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2answers
2k views

Rewiring USB LED lights to directly use a 5V DC-DC Converter

I'm currently helping a friend who is renovating a VW camper to fit some LED lighting as she has no electrical experience. She has a 10 metre set of LED fairy lights that are powered via USB (bigclive ...
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0answers
499 views

Component identification from vintage tachometer

For the purpose of understanding how it works, I'm attempting to reverse-engineer the schematic of an analog gauge. For some context, it's an analog tachometer from the 70s, with a scale from 400 to ...
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7answers
475 views

How to detect if a nearby parked car has started engine?

We have a project with a machine servicing a car parked next to it. It's comparable to a car washning machine. Before the machine is started, we need to be 100% sure that the engine is off. Also, if ...
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1answer
623 views

Charging a lead-acid battery in a car

I want to add/charge a lead-acid battery UB1250 with the 12v system in my car. I put a battery quick disconnect directly to the battery so that long term, the main battery does not die. Problem is ...
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1answer
1k views

Need help controlling a relay using a dimming light

TL; DR: Trying to control a relay using a dimming light. When the light is fading on and off, it causes the relay to switch on and off very quickly. Hi all, I am trying to control a relay with the ...
3
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1answer
305 views

12V variable-speed fan as a function of temperature using 555 timer

I would like to turn the car fan into a variable-speed fan using a the analog temperature sensor of the car, and a 555 timer. While temperature decreases, resistance (of the sensor) increases. Can I ...
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3answers
4k views

soldering wires to 12 V car plugs?

Many of the cheaper lighter adapter plugs do not come with screws for connecting the wires to them, but rather with just the bare metallic contacts - to which I am supposed to do what, solder the plus ...
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1answer
471 views

Can I add flyback diodes to my car window motors?

I have an older car with a known issue with the window switches: they carry all the motor current, and after a while the contacts suffer carbon buildup presumably from flyback arcing. Commonly, owners ...
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1answer
6k views

How to wire up camshaft position sensor in lab environment?

I have taken out this camshaft position sensor out of my Chevrolet Aveo 2007 and I am trying to verify whether the issue I am facing is with the sensor or the ECU/computer (the car cranks, but does ...
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1answer
65 views

Problem with green and blue RGB diodes [closed]

I have a setup of 6 RGB diodes in parrallel, each diode has seperate resistors for each color. My problem is, when i connect the diodes on a 12v supply, all leds and every color works, but when i ...
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1answer
69 views

Car plug from batteries

I've recently bought an air compressor with a cigarette lighter socket cord. It plugs into your car. The specs say that it takes 12V dc at 14A but I want to power it with small batteries (AA, AAA, 9V)...
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3answers
7k views

In a car, what is the difference between a 12-V and a 24-V system?

As I understood, 12-V car system refers to automotive system that runs with a 12-V battery. What are the basic differences between a 12-V and a 24-V (actuators, ECU...) ?
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2answers
600 views

UPS battery as auxiliary power supply for car - charging and detecting car on

I'm designing a arduino-based car system that I would like to have running even when the car is off and parked. Though the system is designed to be very energy efficient, I don't want it to run down ...
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1answer
97 views

Help understanding voltage limits in a PNP transistor

As seen below, I have a circuit that turns on +12V to the EN pin of a LM53601 buck converter when the +6V DC component in a car speaker wire is detected (bridged output). This works fine. But I am a ...
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2answers
630 views

How to isolate the car ground with MCU ground?

I know optocoupler does the job of isolation very well. How to isolate supply ground? If car battery is supplying the power to the MCU, then the ground will be common always and it defeats the ...
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1answer
281 views

How to combine and protect two 12V automotive signals into one?

In the below circuit, the DC component (6V) of a bridged car head unit speaker wire turns on a LM53601 buck converter. The LM53601 accepts voltages up to 42V. The +12V input into Q2 is protected to ...
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1answer
297 views

Ceramic Capacitors [closed]

What is the difference between General purpose and Automotive grade ceramic capacitors, if they have the same capacitance, temperature coefficient and operating temperature. is there a manufacturing ...
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2answers
7k views

Weak key fob signal

I have a VW Golf 5 from 2004. I have bought it about 4 years a go. I have 2 pairs of keys. With the first one, I could never open the car remotely. The second one worked quite well but its range ...
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35 views

How does an autoradio suppress transient, switching “plop” generated by an external audio source?

Out of curiosity I'd like to know how an autoradio device works. Maybe it' not how they all work and my case is just an exception but here it is. I have a car TV tuner that is used to switch between ...

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