Arduino ohm & diode meter information

hello to everyone :slight_smile:
normally there are 2 probes at the multimeter
om meterle detailed information have
but I didn't understand anything. I want to measure usb data (-+) on laptop

normal ohm meter

how can i use this process usb data

I just don't understand the logic here. or is it possible to measure this operation at the diode position?
Meanwhile the laptop will not work in this measurement

thanks in advance :wink:

Sorry, we are not ignoring your question.

I can't understand what you are asking for help with. I guess everyone else feels the same. Sometimes it helps if you explain like you are talking to your grandmother.

What is the relationship between that ohm meter (do note that "meter" and "metre" have two very different meanings) and the USB contraption?

(one thing to note is that USB signals are way faster than the Arduino's ADC)

Your question is valid, being new to this it is hard to understand you are simply using the wrong tool. As you gain experience this will fade into the background. I have yet to meet somebody alive today that was born knowing all of this stuff, they had to learn the same way, by asking questions. I understand if you are not fluent in the field you cannot always ask a proper detailed question. The Data + and Data - are digital signals and are relative fast. The Arduino you are using is communicating with your computer via this universal serial bus (USB). I would suggest you get an introductory book on electronics, this will help you understand what is happening. Look at this as Forward Action In Life! The tools that would work to easily see this are a logic analyzer, a scope, and some other devices not as common. You can get a logic analyzer on eBay for less then $10, it is limited but will show this.

Good Luck & Have Fun!
Gil

I'm sorry if I misspelled the sentences
my english is not very good

With a multimeter it is possible to measure the usb data - + pin of a laptop
both omaj is taken as a value and diode speech a value is possible (multimeter)

can I do this with the arduino analog pin?

What exactly are you trying to measure?

wvmarle:
What exactly are you trying to measure?

I'm a laptop motherboard repairer myself
Usually new generation processors usb port is broken .I am developing a project myself
want to measure usb data short circuit via arduino. it is possible to measure multimetrle
for example: 0.10 - 0.50 ohm - usb data -/+ means short circuit
Calculating resistance to arduino . I want to know if it is possible to do something like this through it

project like a diagnostic box - Memeory votlae tester + usb data tester
I prepared the voltage part - laptop memery voltaj testing

A short is easy to measure as such. Pull-up to Vcc on one side (can use the internal pull-up for this), GND on the other side, measure the voltage at the mid point. If near zero (logic low) there's a short; if near Vcc (logic high) it's not shorted.

But whether that works depends on the internal circuit of whatever the USB connector in question is connected to.

Dedicated USD testers exist. They have a little screen which can show the status of the data lines. Buy one of those.

MorganS:
Dedicated USD testers exist. They have a little screen which can show the status of the data lines. Buy one of those.

I searched but could not find
Usually voltage measurement

Is google broken for you? This is the first result I get: https://www.amazon.com/Eversame-Multimeter-Chargers-Capacity-Banks-Black/dp/B01D9Y6ZFW This is not a reccomendation but I own several devices which look like this one.

Since it is important for USB chargers to hold specific data line voltages, the tester can display those.

these don't work for me
I need to do the measurement in case the motherboard is not working
/
I'm a laptop motherboard repairer myself
Usually new generation processors usb port is broken .I am developing a project myself
want to measure usb data short circuit via arduino. it is possible to measure multimetrle
for example: 0.10 - 0.50 ohm - usb data -/+ means short circuit
/

wvmarle:
A short is easy to measure as such. Pull-up to Vcc on one side (can use the internal pull-up for this), GND on the other side, measure the voltage at the mid point. If near zero (logic low) there’s a short; if near Vcc (logic high) it’s not shorted.

But whether that works depends on the internal circuit of whatever the USB connector in question is connected to.

like this ?

wvmarle:
But whether that works depends on the internal circuit of whatever the USB connector in question is connected to.

USB device on motherboard depends on chipset
usb data(-+) part communicates directly with chipset