Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [smartphones]

49 questions
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How to reconnect to potential of ripped off solder pad without visible circuit traces

I am trying to get a data backup from a broken LG/Google Nexus 5 smartphone. It was repeating in a boot loop, because the on-switch was stuck at always on. I dismantled the mainboard. Here is a overview: After desoldering the little push button…
David
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Are smartphone cells actually charged with 9V using QC and other techniques or does the smartphone always step down the voltage?

I'm having this disagreement with a good friend of mine regarding charging voltage of the cells inside modern smartphones when quick charge, USB PPS and other techniques are used. Let's take as an example Samsung's S21. In my opinion, since its…
olokos
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Why an 8kHz notch on the headset mic input of a Qualcomm WCD9330?

I have here a smartphone which uses a Qualcomm WCD9330 audio codec IC. (Itʼs a Galaxy Note 4.) Iʼve discovered through testing that the headset microphone input exhibits a roughly 10dB notch in its frequency response at about 8kHz, and, as well as…
Kevin
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How do I trigger capacitive touch screen electronically (without hands)?

I would like to trigger a "touch" or "touches" to a smartphone screen electronically without actually touching the screen with my finger using a remote control somehow. The idea would be that every time I would press the remote control, it would…
Vbs
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Galvanic isolation of phone chargers

I have seen a video on the web where a person is testing the galvanic isolation of several phone chargers. I am talking about this kind of phone charger. They are plugged into the wall with no connection to earth, and are supposed to deliver 5 V…
AladdinSane
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How/where can we use/have camera modules similar to those of smart phones

Many laboratory or embedded systems projects can leverage cameras similar to those of smartphones because of their size and geometry in general. But the problem is we cannot just take out the camera parts from smart phones and put it in our setup…
Alejandro
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Can you power a smartphone (no battery at all) by a power supply alone?

I have a project in mind, where I need alot of parts that quickly would make this project really expensive. Then I thought that, all the parts I need is already in a smartphone, but I don't need a battery. Is there a easy way to replace the battery…
Repeller
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Type-c device for smartphone with optional charging

I've been challenged to "make" an accessory around this gps module. The idea being to receive the GPS through the serial port emulated into the phone whilst being able to optionally power the GPS module and the phone with an external charger. I'm…
tafpc
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How to estimate Li-ion battery health for an unused smartphone?

I am considering purchasing a new smartphone that is several years old and could use a little electrical engineering help from the EE geniuses here. I've performed quite a bit of research, and found so much conflicting (and just plain wrong)…
RockPaperLz- Mask it or Casket
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Is that possible to modify and connect a dead smartphone camera to a PC using USB cable?

There are many videos on YouTube that explains how to use camera of a dead smartphone and connect it to phone by USB-OTG. However I want to know Is that possible to modify and connect a dead smartphone camera to a PC as webcam using USB cable? Does…
C.F.G
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Display power consumption ratio of smartphones and smart watches

What is the most power-consuming part of your smartphone or smartwatch display? Or is it cpu? Naturally I think that it will change depending on the situation, but general use is assumed.
たくまいわき
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assited gps vs differential gnss

i am writing as essay evaulating accuracy of smart phone gnsss for GIS data collection for part of the essay i thougt it appropriate to mention DGNSS and Assisted GNSS. So far i understand Assited gnss is using cell towers to send over sateltie…
Tom Haywood
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NFC/RFID device sending URL to NFC-enabled smartphone at 20-30cm

I am very new to this so please bear with me. I have read many questions but I haven't quite found a suitable one for what I would like to do. I would need a NFC/HF RFID device able to send an URL to a NFC-enabled smartphone (with no app or…
Pietro Dalpane
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4Channel Smartphone Charger 5V 25A

I wanted to experiment a Smartphone Fast Charger. My source would 5V 25A, and output would be in 4 channels, all in parallel. Would that be safe to charge a smartphone? If no, what can I use to bring down the ampere in one channel? Say, I'll be…
Aaron Alfonso
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Do all smartphone displays use same protocol (Mipi) for display driving?

I thought of implementing a tool for capturing display signal over smarthphones with broken LCD. The idea is to open a smartphone and intercept the signal transimitted over the display using a Raspberry pi. Then once signal captured, it can be…
Dimitrios Desyllas
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