Questions about iPhone's hardware and interfacing circuits to iPhone

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0
votes
2answers
90 views

Why would phones have a radio receiver, but not activate it? [closed]

According to some recent news articles, many cell phones including iPhones and Androids have built in FM receivers, but they are not "activated". Why would the phones have such a feature but not ...
2
votes
2answers
95 views

On an Apple 12W USB Charger, how are the D+ and D- lines configured?

Looking for the voltages on the V+ and V- lines of an Apple 12W charger that corresponds to the 2.4A output.
0
votes
1answer
77 views

Working on a high current USB charger

Title says it: I'm working on building a high current USB charger for my devices so that I can integrate USB ports into my headboard. However, I'm having a few glitches. When I plug in a device, the ...
-1
votes
2answers
71 views

Does it help to replace the battery if phone is slow? [closed]

Some people I know say that replacing the battery helped their smart phone improve its decreased speed resulting of two years of use. My initial guess is that this would not have any influence ...
-2
votes
3answers
163 views

How much mA to charge an iPhone

I'm building an iPhone solar charger and I'm not very good with electronics but I want to know how long it would take to charge an iPhone 6 fully. The panel I'm using has: ...
0
votes
1answer
72 views

USB data cable that doubles up as a USB storage device

Is it possible to create an USB to micro USB (or lightning) cable that has storage built into it? So if it's plugged into a computer with no phone, the computer recognizes it as a regular USB ...
2
votes
1answer
99 views

Multiple PWM signals from a single audio channel

Here's my project in a nutshell: I'm building a quadcopter and I need to control each of the four motors independently. I'm using an iPhone as the "brain" of the quadcopter, with of all the control ...
-2
votes
1answer
93 views

How to read the headphone jack in android or iphone [closed]

I have two switches that I would like to connect to an android phone (and/or an iphone). To be clear, I would like to connect a morse code key that has three connections: a ground, a dit and a dah. ...
1
vote
1answer
40 views

iPhone Charging Current Zap

I charge my iPhone 4 right next to where I build my circuits, so I'm always simultaneously looking up datasheets, texting and so on. What's interesting is whenever I touch the rail/antenna of the ...
-4
votes
2answers
201 views

IPhone charging with Supercapacitor [closed]

Can a 3000 Farad Supercap at 5V charge an iPhone? If yes how much will it charge it percent will it charge it to? Thank you
0
votes
1answer
637 views

Turn on/off led via headphone jack in iPhone

I have an iPhone project , I need to turn on and off a led powered with a battery using iPhone via 3.5 mm jack. there is some examples what I need https://www.youtube.com/watch?v=w0VopnVZQ-w ...
-1
votes
1answer
43 views

Emulating the start/stop button on the remote control of the iPhone

I need to build an (apparently) extremely simple device which is basically a pushbutton that pauses and restarts the playback on an iPhone. This is exactly what the central button does, on the remote ...
0
votes
3answers
369 views

Can a magnetic wire be used to extend/strengthen the signal coverage of a cellphone? [closed]

When i'm inside of our apartment, getting a cellphone signal is very hard, often times I wouldn't get any bar in my iPhone. My unit is in the ground floor and is surrounded by tall walls. My apartment ...
-1
votes
1answer
768 views

HM10 Bluetooth (CC2541) put in to sleep while connected to iOS application

I'm trying to trigger an action on iOS application using HM10 Bluetooth module. And i have successfully accomplished the functionality, But now my concern is the power consumption, I have already ...
-1
votes
1answer
783 views

How can I power a cellular phone for a week with a car battery or other type of battery? [closed]

I am about to start construction of a new house, and unfortunately the property is not near where I live. I wanted to keep an eye on the construction site (No electricity) to make sure workers are ...
0
votes
1answer
144 views

Why does my iPhone / electronics still work even when dropped in water? [closed]

I was wondering why does an iPhone that has been dunked in water still work afterwards even though it hasn't fully dried. While some other electronics stop working completely after touching water. I ...
1
vote
1answer
263 views

GSM Battery/Amperage Usage

I have a general question. I have a GSM module (adh8066 link to data sheet below) that I purchased from sparkfun. In the data sheet, it states that in tx mode, the module can draw up to 2 amps @ ...
0
votes
2answers
297 views

iPhone jack remote buttons wiring

I'm trying to emulate via Arduino the volume down button of the remote mounted on iphone earbuds, and I can't find anywhere how that function is achieved; I imagine ...
1
vote
3answers
319 views

Is there a metal that will not interfere with smartphone reception as a case?

I want to design an iPhone case that will include a metal plate on the back of it. Is there any kind of metal that will not interfere with the phone's reception?
2
votes
1answer
549 views

TRRS connector with iphone circuit board, how to get mic compatible with PC input (Bose Q25)

I have a Bose Q25 headset, it uses an iphone compatible trrs jack. It contains stereo input, mic output and the button controls. I split it into 2xTRS jacks using a commercial splitter, the mic is ...
1
vote
1answer
101 views

Can I modify this bluetooth keyboard to only have a certain keys so I can carry it around?

I'm trying to make a bluetooth remote shutter release thing for Androird and iOS. I asked about doing it from scratch but everyone thinks it's too ambitious for a beginner, so I gave up on that Few ...
1
vote
1answer
266 views

Making Device to Send Data to Smartphones: 100m range, 1kb/s bandwidth, low power

What I want to make: A device that immediately sends a notification if the device incurs a moment of high acceleration. The notification needs to denote the acceleration. There is no guarantee that ...
-2
votes
1answer
161 views

Is it bad to charge an iPhone 5S with an iPad Air's charger? [closed]

Often in the little leaflets that come with chargeable electronic gadgets, manufacturers state that you should only use the original supplied charger to charge the gadget. We all know that an iPhone ...
0
votes
1answer
98 views

What components do I need to connect a phone to my device via Bluetooth?

I have a phone I want to connect to a docking station I am making, via Bluetooth for as cheap as possible. As I understand the situation, all I need is something that can pick up a bluetooth signal ...
13
votes
2answers
2k views

How does this iPhone app measure the power flowing through an AC appliance cord?

My electric utility released an iPhone app called "DTE Insight" which (among other things) measures the amount of power flowing through an appliance's power cord by asking you to hold the cord against ...
1
vote
0answers
341 views

How to transfer data via an Apple Lightning port

I have a board on which a microcontroller reads the output from a sensor. I am thinking of connecting it to an iPhone so that the iPhone can read data from it. The board should also be powered by ...
0
votes
1answer
422 views

Amplifying analogue audio from an iPhone docking station

So I have an old iPhone speaker dock that broke after I plugged in the wrong cable and fried the microchips on the circuit board. From it however I salvaged the dock connector itself and a couple ...
0
votes
1answer
621 views

Lightning Connector Power Output rating/ Apple Policy

I am currently in the process of developing an external antenna for smartphones, so the answer of the following question(s) pertains to the feasibility of this product. What is the line level output ...
0
votes
1answer
702 views

Re-programming PIC microcontrollers with USB through smartphone

I want to be able to reprogram my microcontroller through my smartphone. My microcontroller will be sending data to the phone through USB with a built-in USB module. However, I will run into the ...
1
vote
1answer
86 views

Scrapping conponents from an iphone

I have an iphone 4 that no longer works. I know that selling it is always an option, but i'm curious if i can scrap spare parts from it instead (especially sensors). I've looked online, but haven't ...
2
votes
0answers
189 views

Build or Buy Bluetooth 4.0 BLE Tag [closed]

I am planning to create a mobile application that scans a NFC tag and performs an action based on the unique scan (tap). Because Apple iPhone do not support NFC I am forced to look for an alternate ...
0
votes
2answers
279 views

How does iPhone detect when dock connector is connected to an audio input?

I'm trying to solve a seemingly simple problem with (hopefully) an equally simple solution. I'm strictly an amateur when it comes to electronics, so I'm hoping someone here can guide me in the right ...
4
votes
1answer
690 views

passive high pass filter to iphone mic jack

I'm attempting to input a heart rate signal into my iPhone via the microphone jack. I need to pass the signal through a passive high-pass filter to remove the DC offset before inputting it in to the ...
-2
votes
2answers
106 views

Getting the direction that user is facing

I've just started playing with electronics and I'm wondering. As you guys probably know, using the iPhone you can get the direction that the user is facing. My question is, what electronic ...
3
votes
2answers
1k views

Counting number of bluetooth 4.0 (BLE) devices near me?

Does bluetooth allow you to discover devices around you that are simply on but aren't in any discovery state? I am not trying to pair with all these devices but merely count the number around me and ...
3
votes
2answers
364 views

Is there a means of USB interfacing to an iphone, which does not require an expensive Apple approval process?

I am developing an external hardware that needs to make USB interface to iPhone. (30pins for now). I do not think Apple would approve MFi for an individual. For USB interface, is there no way? Or ...
-1
votes
1answer
412 views

Typical Power circuit for smartphones? Correct energy measurement? (Nexus 4, iPhone.. etc)

I am trying to perform some energy measurements using smartphone. And to make sure that I am performing my calculations correctly, I been trying to find any examples of typical power circuit in ...
2
votes
1answer
138 views

Add iPod 4 dock to old Hi-Fi (Will my idea work?)

I'm currently attempting to add an iPhone Dock to my old Aiwa Hi-Fi system. I've used a multimeter and established that the VCC for the Hi-Fi's internal circuitry is ...
1
vote
1answer
2k views

Pinout of iPhone 4/4S rear camera connector?

Has anyone come across the pinout of an iPhone 4/4S rear camera module connector?
1
vote
2answers
2k views

iPhone Headphone Jack - Accessory & Headphone Use

I'm working on an iPhone accessory that consists of a temperature sensor and LED. I want to power the accessory through the iPhone headphone jack, but I'm concerned that the user can't use headphones ...
0
votes
1answer
409 views

How much energy can the iphone output into an external device?

I am having a lot of trouble finding any concrete information online about how much voltage/amperes the iphone 30pin as well as the new 8pin connector is capable of outputing to an external device. ...
4
votes
1answer
2k views

Can the NFC antenna of smart phone read signals from (active) RFID tags/transmitters

Can the NFC antenna of mobile phone such as the Galaxy S4 or iPhone in addition to their NFC functionality, also be used to read signals from (active) RFID tags/transmitters e.g. from 20ft away not ...
3
votes
1answer
1k views

Circuits for two way data transfer from iPhone to Arduino via headphone jack

What I'm trying to do: I recently bought an iPhone 3GS (yes iPhone...) and I am going to install Android on it so I can make apps myself for it and incorporate it in a bigger project, using the WiFi ...
1
vote
2answers
2k views

data signal on headphone jack input on iPhone [closed]

I am building an external device for the iPhone that will produce an analog signal that I want to send through the headphone jack. From all my reading, all data sent through the jack is in analog ...
-2
votes
2answers
1k views

How to use iPhone to evaluate an IMU chip?

I have a quadcopter like the below (source of the image) and I have an IMU (inertial measurement unit) having acc sensors in X-Y-Z and gyro sensors in X-Y-Z. Now I am trying to find an iPhone app ...
7
votes
3answers
2k views

Is a human (or other) electrical signal absolutely necessary to activate a capacitive touchscreen?

I know this is the general wisdom, and that someone has asked a similar question here: How can a capacitive touch screen be triggered without human contact? However, I didn't quite understand the ...
-1
votes
2answers
131 views

iPhone control LED light without wifi

I am fresh to the electrical engineering, and actually I am a web developer, ruby and php, etc. I am wondering that is there a simple way to control one or more LED lights using iPhone without wifi ...
2
votes
0answers
6k views

Convert Iphone 3.5mm pin to standartd Samsung Android 3.5mm pin

This is a simple question. I want the new Iphone EarPod to work with Samsung/Nokia phones. I tried to use the headphone to Samsung phones. Here is the result Here is the Universal 4-pole Cell ...
1
vote
1answer
403 views

Can I convert audio signals from an iphone to electrical signals to control another device?

I wish to design a mobile app that will allow me to touch parts of the screen, generate a music tone that will be converted to an electrical signal to move part of a toy. By touching different parts ...
4
votes
1answer
3k views

Arduino - Trigger an iPhone's touch screen with no human interaction

I'm trying to replicate part of this experiment. Specifically, I want to touch the screen with a cable and some aluminum foil whenever I send a signal from an Arduino pin. From the blog post linked ...