I am asking, because the app Electrosmart only shows some details for wifi network from router. however I would like to measure for instance wifi receiver in my laptop, or mobile, or bluetooth devices, that I understand also release waves.

Hi guys,

Just me again trying to measure the speed of a vibrating motor using a Due. Here's my schematic. I'm measuring the back-emf of a motor across a 1.5 ohm resistor and through a high pass filter, which I then amplify via an op amp to get a signal big enough to read.

I tuned everything on PWM=255 and got a nice trace that can be measured with interrupts really nicely and has a DC offset that makes it not fry the Arduino. I tried changing the speed and the speed changes nicely, which I can measure on an oscilloscope, but I can't measure it with an Arduino because the number of spikes changes (lower speed = more spikes)

https://imgur.com/a/kRBtJLy

Does anyone know why this might be happening? How can I measure my speeds without an oscilloscope?

Thanks so much!

The best consumer devices only seem to measure up to about 10ghz.

That won't cover 5g operating in the 30 ghz range. Supposedly this stuff can also go into the 60-70ghz range too. But it seems 30ghz is more common at this point as the highest used.

There's one I saw on Amazon but comments said it isn't sensitive enough. Im looking for a sensitive one

Which meter(s) could I buy to measure from about 1hz to 30khz?

I'm having trouble finding khz meters.

Would there be an all in one for 1hz to 30khz?

I'd prefer it to be 3 axis too.

Hoping on some recommendations.

Thank you.

Now that I should hopefully be done with internship interviews for the rest of my life, here's a mega list of almost every interview question I was asked from 150+ interviews at Facebook, Apple, Amazon, Nvidia, Google, Microsoft, Qualcomm, Analog Devices, Texas Instruments, Northrop Grumman, SpaceX, Tesla, etc. This is going to be a massive step up from "part 1" that I posted a while back now that I have more coursework, internships, and interviews under my belt.

This was originally going to be part of the Interviews chapter of my internship search guide, but that post just got WAY too long so I decided to create a separate post just for this repository of questions. That post is still chock-full of interview advice and experiences, so check it out when it's ready! And before you get started, take a guess at how many questions this list has! (bonus points if you comment your guess because I'm also curious about your guesses!)

If you're reading this on Reddit (or not my website), check this post out on my website! You'll get this super cool table of contents bar that will make navigation much easier through this massive post. Any updates to this list will be reflected on my website, not this Reddit post or anything else. Also Reddit only allows posts up to 40,000 characters and my full list way exceeds that so you'll need to hop over to my website to get everything else. For some reason, Reddit has trouble recognizing my list so this Reddit post will have bullet points to identify questions, while my website has a BIG numbered list. And more importantly, you'll be giving me ad revenue!

Disclaimers and Notes

• These questions were for internships, but there's a lot of overlap with full-time (FT) interviews. In fact, I'm doing FT interviews at the time of writing this and they basically ask the same stuff, there are usually just more FT interviews so they have an opportunity to dive deeper and ask more questions I'd even say some of my internship interviews were harder/more in depth than my FT interviews. If the questions end up being super similar, I may just rename this post instead of making a new one lol.
• These questions are reflective of my s

Talking about head shielding.. take a look at this: https://www.reddit.com/r/Electromagnetics/comments/a95ki0/video_review_of_emf_protection_clothing_measuring/

Hi!

Does anyone know how to extract the gps coordinates of a DJI drone along with the time stamp in an excel file?

I want to make an application where I have to synchronize the time stamp of the drone with the time stamp of a measuring device. Thanks!

Hey guys, I did a reply yesterday to someone who was wondering if there is a full list of all the hints/tells that the ghosts have.I have decided to actually make it into one big giant post.I'll highlight keypoints with CAPS letters, make sure to follow these keypoints in your game otherwise your tests might fail! All of these observations ware made using NIGHTMARE MODE
You can say that if you're thinking about going NIGHTMARE MODE, then that is the post for you

Enjoy Ghost Hunters!

1. Spirit : If you use a Smudge Stick to the CURRENT GHOST LOCATION, the ghost will be unable to do a hunt for 180 seconds (3 minutes) have a timer or watch your PC clock.
2. Wraith : Doesn't have a specific ability 'yet' but it WILL NOT GIVE FOOTSTEPS WHILE IT HAS STEPPED ON THE SALT (prepare your glowstick or UV light to track that also include a camera, these feet pics are precious.)
3. Phantom : Once you take a picture of a GHOST EVENT IT WILL DISAPPEAR from the journal but it will CONTINUE SINGING WITHOUT A PRESENT GHOST MODELSecond giveaway, during a hunt the Phantom will BLINK TWICE AS SLOWLY AS THE OTHER GHOSTS.
4. Poltergeist : They enjoy throwing items (A LOT) . I've done personal tests, lined up all kinds of objects in the house and they will throw them a lot more frequently during a hunt.
   GIVEAWAY/TEST, if you stack piles of items of 4 or 5 objects and you track their movement if it is a Poltergeist it will THROW ALL THE ITEMS FROM THAT PILE AT ONCE
5. Banshee : Banshee's will always have a MELODICAL TYPE OF GHOST EVENT (singing)
   TEST, they will have an INCREASED RANGE of activating the crucifix when it starts to hunt ( space one out inside the room in the middle and the other one outside of the room preferably in front of the door).
   GIVEAWAY, Banshee's will have a chance to activate a specific type of GHOST HOWL when you're holding the PARAMICROPHONE (refer to youtube for that specific howl)
6. Jinn : It will speed up rapidly from afar to your location if he sees you.
   GIVEAWAY 1, Jinn will NEVER TURN OFF THE BREAKER.
   TEST OR GIVEAWAY?, Jinn are supposed to STILL SEE YOU WHEN YOU USE A SMUDGE STICK ON THEM RATHER THAN THE THEM BEING STUNNED FOR X AMOUNT OF TIME (don't hide in front of it, or in that same room when you smudge it).
   Secret ability, Jinn's have a chance to drain your sanity by 25% when you're near them
7. Mare: Probably one the most annoying ones out there... They don't have a special ability on nightmare

Would I need a EMF detector?

I appreciate, I do not know about the subject but I would like to know what would be the most suitable aarate to measure radiation

I bought a "Happymodel Diamond F4 FR 5-in-1 AIO Flight Controller w/ Built-In ESC, VTX, Receiver" with a bad ESC. These seem to be out of stock everywhere, and I thought the problem might have been on my end, so I decided to debug it instead of attempting a return. In the end I fixed it, and I wanted to share how I did so for anyone else with a similar issue. I also have some notes on the board that may be useful for other issues.

The problem: Upon arming the quad, one of the motors (M4) twitches a few times, then beeps and stops moving. The other motors are spinning normally. No amount of throttling or adjusting in BLHeli or BetaFlight can get this motor to spin. However, it seems to work sometimes - even if only momentarily.

My Debugging Process

1. I thought the motor was bad. I swapped it for a brand new motor, same issue. I swapped over one of the motors that was working, same issue. I swapped the twitching motor to a different ESC, it started working. (the motor was fine)
2. I tried various settings in BLHeli and Betaflight, no luck. (the problem must be with the ESC for the twitching motor)
3. I tried to look at the output from the ESC on an oscilloscope, and accidentally shorted two pins, blowing up a MOSFET. The motor twitching didn't change much, so I thought that MOSFET had always been bad, and may have been on the verge of blowing from the start.
4. I used a current probe to look at the wires to the twitching motor. Sure enough, one of the MOSFETs was not working.
5. I replaced all of the MOSFETs for the M4 ESC. Everything seemed to work intermittently, motor 3 also twitched sometimes.
6. I replaced the MOSFETs for the M3 ESC (I assumed that, by running with the damaged M4 ESC, I had somehow damaged the M3 MOSFETs).
7. Things still seemed to work intermittently, then stopped working suddenly. (the MOSFETs were not the problem)
8. I looked at it on the oscilloscope again, the voltage levels, timing, and shape of the signals all looked fine, meaning they looked the same as for one of the working motors. (the driving circuitry is fine)
9. At this point, I assumed it had to be the back-EMF sensing circuitry that was bad. I do not know what this circuitry looks like, and could not easily follow the traces on the PCB. I did something that I should have done at step 3: I disconnected motors 3 and 4 and measured between the pads.
10. I measured diode drops: between the pads of M3 they were all about 1V, between the pads of M4 they were

I am trying to shield my laptop and work environment as much as possible from EMF however I am trying to keep a low profile as I work in a busy office environment, and I would like to find a good EMF reader for Android phones or tablets I can use at work without being seen doing anything suspicious

I recently purchased a TF2 meter to check my exposure level to EMF, EF and RF fields in my office and bedroom and am simply shocked.

I have always made a conscious effort to have absolutely everything hard wired, yet some of my wired devices are completely frying me; allow me to explain.

In terms of my office set up, my wireless mouse is the only component that is not wired, yet somehow gives off the least amount of EMF and RF pollution. My wired keyboard however ( Logitech G413 ) is giving out terrible EF and RF radiation, the same as my wired headset ( Hyperx Cloud ii ) which gives off awful EF, EMF & RF radiation which is particularly concerning seeing as it sits on my head for many hours a day. How can this be so? Surely the entire point of making sure everything is hardwired is to avoid the radiation; or have I overlooked something here? I won't even begin to go into the RF exposure from my 3 monitors, albeit only up very close.

One of the solutions I have come up with is to insulate all of the wiring behind my desk, so as to reduce my EF exposure ( can post link to the product in comments if anybody needs ) but I am completely dumbfounded in terms of how to make my wired devices, which I thought would be completely clean, function without irradiating me to the extent that they are?

Any help or explanation for why this may be the case would be greatly appreciated!

Edit - I hope this is the right place for this post, apologies if not