The cellphone tag has no wiki summary.
13
votes
4answers
556 views
Phone as Microcontroller
I have a couple of cell phones laying around, one of them being this one:
http://www.gsmarena.com/sony_ericsson_elm-3057.php
Is possible to clear the flash memory and replace it with a bootloader and ...
8
votes
7answers
1k views
Can a credit card be demagnetized with a nearby cellphone?
Suppose I have a standard credit card with a magnetic stripe, lying
right on top of a cellphone, or
in a regular leather wallet that's lying right on top of a cellphone.
The cellphone is on (but ...
8
votes
4answers
928 views
Arduino with cell phone
I am trying to simulate button presses on a cell phone by using the Arduino to complete the button circuit thus simulating a button press. I figured out I have to use a transistor but I can't get it ...
8
votes
1answer
3k views
Does leaving a cell phone on charge all the time weaken the battery, and why?
If I leave my cell phone with the charger plugged in all the time, would this weaken the batter, and why? I've heard that you should only charge the cell phone when you receive a 'battery low' message ...
7
votes
3answers
405 views
Is there an electrical design reason for phone SIM cards being inaccessible until a battery is detached?
So far I haven't seen a cell phone that allows to detach the SIM card without first detaching the battery - the SIM card is placed behind the battery and inaccessible unless the battery is detached.
...
5
votes
4answers
2k views
Do electromagnetic shielding stickers do anything?
I recently bought some cellphone accessories, and as a free gift, the merchant gave me a "24K gold plating electromagnetic shielding sticker", whose instructions are all in Chinese, but I guess you're ...
5
votes
3answers
3k views
Do 3G and phone calls(gsm) use the same antenna in a mobile phone?
When I disable "3G or EDGE" (cellular data) connection from my smart phone's settings, I can still make a phone call.
Do phone calls and cellular data use different antennas and frequencies in a ...
5
votes
3answers
2k views
Why do my speakers make a noise when my cell phone gets a call?
It's a very common sound but I've never thought to question why it happens.
4
votes
4answers
347 views
How can cell phones location be detected?
Specifically: cell phone not connected to internet, not used to talk, just powered
on. What if it's powered off?
4
votes
1answer
397 views
What protocol does a TDD/TTY use to communicate with a cell phone's headset jack?
Some cell phones are TTY/TDD (telecommunications device for the deaf) compatible, meaning a terminal can be plugged into the headset jack for text communications. Is it just a hidden RS-232 interface?
...
4
votes
2answers
567 views
How to interface a Blackberry Torch with a serial device?
I have a Blackberry Torch that needs to send 10 bytes per second to a serial device. The serial device will probably be a basic stamp 2 or other microcontroller. The Blackberry does not need to ...
3
votes
2answers
1k views
Is it possible to wire up a cellphone screen to work with a different device?
I'm trying to find out if it is possible to send video to a cell phone screen (just the screen, not the phone) like this one from something like a video-mp3 player or even from maybe a mac-mini, or ...
3
votes
2answers
81 views
Why do mobile phone transmissions come in pulses?
We are all familiar with the phenomenon that mobile phones induce in amplifiers and loudspeakers. The bip bip-da-bip bip-da-bip which happens just before you get a call, or if the phone is just ...
3
votes
1answer
247 views
Connecting to external chip (device)
I want to create mobile app that will control some external simple mechanical device. I want to use bada wave s8500 for this purpose so have access to Bluetooth and WI-Fi. Now I'm looking for advice ...
3
votes
1answer
529 views
Need formula to selecting coaxial cable type and GSM antenna
Need formula to selecting coaxial cable type and GSM antenna
I'm using a GSM modem for my application which is often installed at a basement where there is no GSM signal so I will need to attach it ...
2
votes
2answers
233 views
Can a faraday cage cell phone case protect wearer against possibly harmful signals?
I don't know much about harm a cell phone can cause if worn close to human body for prolonged periods of time, but I'd like to know if the phone's signals can be dissipated from the side of wearer's ...
2
votes
3answers
904 views
Making a portable HTC Hero Android phone charger
I want to make a little battery-powered portable phone charger (maybe 9V).
I have seen similar USB powered battery chargers such as the Mintyboost.
My phone is the HTC Hero. Would the design be ...
2
votes
2answers
821 views
Logic Level Converter, Arduino and Cellphone
I am trying to interface a 6150 Nokia cellphone with an Arduino Duemilanove board, as some have already done through the FBUS protocol (see here for example).
The FBUS protocol uses 2.8V logic, so I ...
2
votes
2answers
440 views
GSM/GPRS module to call phone
I would like to do a DIY intrusion detection system.
I think I understand roughly what it's needed (door magnetic switches, windows magnetic switches, IR motion detection, password prompt, webcam), ...
2
votes
1answer
975 views
smartphone charger voltage rating
I have looked everywhere but haven't been able to find a decent answer. So here goes my question from the depths of my ignorance.
I recently bought a solar-powered charger and battery pack for ...
2
votes
1answer
129 views
From Li-Ion to Li-Po battery: design a new battery pack for old mobile phone
I have an old working mobile phone. The battery, a compatible 3.6V 500mAh Li-Ion is almost dead (the original one was 800mAh). Is it possible replace the battery pack with a 1200mAh or so Li-Po ...
2
votes
0answers
648 views
Datasheet for Nokia 6310 display
I have a Nokia 6310 display which I would like to reuse as a display controlled by an ATMega. I can find plenty of information about N3310 display but almost nothing about 6310.
Does anyone know the ...
1
vote
2answers
701 views
How to correctly store spare Cell Phone Battery?
I've got a spare battery for my cell phone. I'm wondering what the correct way to store it would be, so as to maximize the battery time. Should I recharge the battery to 100%, then leave it aside, or ...
1
vote
1answer
70 views
Modifying an old phone to draw less power?
I have a phone that I would like to install in my car as a GPS tracker, using the following guide: http://gizmodo.com/5691724/how-to-track-your-vehicle-on-the-cheap
I'd like to keep it hardwired to ...
1
vote
2answers
269 views
Consequence, effects and solutions - mobile-phone always connected to AC power
Would like to ensure that a mobile phone is always charged, without requiring manual intervention (s.a. disconnect/reconnect charger, switch on/off charger etc.). One thought is to put the phone ...
1
vote
1answer
197 views
Could my Cell Phone Battery be degrading?
I've noticed that if I recharge my cell phone battery to 100%, then take it out, and put it back in and put the phone back on charging, it resumes charging the battery and continues to do this for ...
1
vote
1answer
98 views
Can a phone battery be used to power Arduino or Motors
I was wondering whether it would be possible to use a rechargeable battery from an ordinary cell phone to power some electronics such as a motor shield for Arduino?
Can that be done and if yes then ...
1
vote
1answer
403 views
Cheap programmable GPS unit?
I'm in the middle of installing GPS tracking into my car using the following guide:
http://gizmodo.com/5691724/how-to-track-your-vehicle-on-the-cheap
Though I'd like to build something a little ...
1
vote
1answer
77 views
How do I calculate the power output of a 12 unit trickle charger for mobile phones? [closed]
I'm trying to do some analysis on the power consumption of mobile phones, charged through a trickle charging unit. My scenario is as follows:
12x smartphones on a smartphone bay (wall).
1x Mains ...
1
vote
1answer
123 views
Any idea on any device which track multiple mobile phones
I'm currently ask to work on a project which I have never worked before.
And I have no freaking idea or its not even in my area of expertice.
Ususally I Google as everyone does. But what is the use ...
1
vote
2answers
589 views
Looking for a cheap cellular modem chipset + GPS
I'm looking for advice about available cellular modem chipsets, my main concerns being power consumption followed reliability & then by weight/size. It can be the worst-performing chipset in the ...
1
vote
0answers
120 views
Does living near a cell tower decrease your overall exposure to RF? [closed]
I understand that my mobile phone will increase its RF levels when it struggles to connect with a cell tower/base station due to distance. Also being nearer a cell tower will increase my exposure to ...
1
vote
1answer
160 views
100% FOSS Linux cellphone - possible? [closed]
Are there any combinations of cellphone + Linux distro out there that allows you to run a near 100% FOSS cellphone with only moderate to mildly severe effort?
Need to haves:
Texting
Calling
...
0
votes
1answer
71 views
Phone charger reading no amperage?
I've got an old Sony Ericsson with a charger that's sustained some damage. The cord has been melted and flattened in one place. Neither the charger nor phone has been used in a long time. The battery ...
0
votes
3answers
599 views
Why do I get feedback in my speakers in my car?
I have a Galaxy Nexus which I have with my everywhere. One of my favorite uses of this device is to play my music. Unfortunately, I have noticed something bothersome and I was wondering if I could get ...
0
votes
3answers
109 views
How to attach normal Phone handset to jack 3.5 [closed]
I have this Question :
How can I attach the normal phone handset to jack 3.5 to use with my cell phone?
For example : there is a product, http://www.cellphoneshop.net/redtel.html
Could someone give ...
-1
votes
1answer
143 views
Can the Arduino Cellular Shield Access the Internet? [closed]
My phone has an internet plan. I took it's SIM card and put it on the Cellular Shield (https://www.sparkfun.com/products/9607) for Arduino, and I was wondering if I can configure the shield to access ...
-1
votes
0answers
81 views
Turn on computer by cell phone but not when it's already on [closed]
I am newbie in electronic engineering. I'm trying to turn on my computer by calling my cell phone. I toke two wires from the vibrator of the cell phone and that's fine, but I don't want to turn off my ...
-1
votes
1answer
49 views
Smartphone Charging Specs [closed]
I am busy building my own smartphone charger and I need to know the charging requirements. I have read in a few articles that the average smartphone with a Lithium Ion battery requires a charging ...
-2
votes
1answer
80 views
How to fix a broken OK button on a verizon chocolate phone [closed]
The OK button on my LG Chocolate does not work. I want to open the case and see if there is some problem with how it completes the circuit. Maybe i can just fiddle with the contacts. Does anyone know ...
-2
votes
2answers
2k views
4 colored wires in a cellphone charger [closed]
I'm trying to recycle an old cell phone charger to power something else. I've cut the tip off and I see 4 wires... with following colors: red, green, blue, and yellow. I can't figure out which ones ...
-3
votes
1answer
174 views
Schema for USB cable to charge old Nokia phone [closed]
I am looking to make a USB cable to charge my antique Nokia phone (Li-ion 3.7v 700mAh). I have searched and found a few articles but they have left me a little confused. The cable should work with a ...
-4
votes
0answers
42 views
How can you hook up a Motorola power circuit to another motherboard? [closed]
I have a Motorola razr v, power circuits. I wanted to know, how can you hook up a Motorola power circuit to another motherboard. So it can power and charge the motherboard. How can this be done?
-6
votes
1answer
466 views
Cell phone from scratch parts [closed]
I am building a cell phone-like device and I was wondering what types of parts a regular cell phone (like the LG Cosmos touch) contain.
Thanks
