Questions tagged [iphone]

Questions about iPhone's hardware and interfacing circuits to iPhone

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40
votes
6answers
159k views

What is the voltage range of a standard headphone jack from a phone?

I want to connect the output from the audio jack of an iPhone to an Arduino. What voltage range can I expect to see on the audio lines from the iPhone? I assume that turning the volume up on the ...
14
votes
2answers
4k 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 ...
13
votes
2answers
4k views

Why do only high-end phones support a lot of LTE bands?

Most lower and middle end phone only support 3/4 LTE bands. High end phones, like the iPhone, or flagships from Samsung and LG also support a lot of bands. iPhone 7: 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, ...
11
votes
3answers
23k views

Electronic aspects of iPhone 3.5mm audio output

I am working for a while now on a small project of building an external mic for the iPhone to be hooked in parallel to headphones (via the 3.5 mm jack). Basically, I want to replace the iPhone's ...
8
votes
1answer
1k views

Mimic human capacitance

In a video at Kickstarter a project called Tapcaps is mimicing human capacitance for triggering touches to a capacitive touch screen (the iPhone). At 0:45 in the video we can see a glimpse of the ...
7
votes
3answers
6k views

Transfering data using ultrasound

Yamaha InfoSound and ShopKick application use technologies that allow to transfer data using ultrasound. That is playing an inaudible signal (>18kHz) that can be picked up by modern mobile phones (iOS,...
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 ...
7
votes
1answer
1k views

Why isn't iPhone minicom reading serial data from Arduino?

Alright, this is my first time posting on electronics.stackexchange.com but I have frequented stackoverflow.com for some time now. Basically I am trying to output serial data from the Arduino to an ...
6
votes
1answer
2k views

Interfacing an ATTiny84 to iPhone from headphone jack

I'm trying to create an adapter and an application for the iPhone that works very similarly to the Square Up card reader. The basic communication I'm trying to achieve: Plug in adapter to phone ...
5
votes
4answers
11k views

How do I build a TRRS headphone jack with a jack that is detectable by an iPhone

I have a circuit and I am trying to integrate it with an iPhone via a TRRS headphone jack's microphone input. I have a generic TRRS cord and am trying to send a signal through it. However, the iPhone ...
5
votes
3answers
2k views

80's Cassette Line to Microphone Level for iPhone

This is a followup question to this one: Using an iPhone as a cassette recorder for 80's home computer I'm trying to record from an 80's home computer (a Microbee) into an iPhone. Although I ...
5
votes
1answer
262 views

Mystery component in Selfie Stick? (iPhone)

What is the component inside an iPhone selfie stick? Testing reveals it is not a transistor. We have done some probing of it and come up with the following: The mystery 3-pinned component drops the ...
5
votes
2answers
17k views

Can a Bluetooth 4.0 BLE device talk to a Bluetooth 2.1 device at the most basic level?

I want to develop an app on an Apple iPhone, that has Bluetooth 4.0 BLE embedded, that talks to a basic piece of kit with a bluetooth 2.1 chip in it? Firstly - is it technically possible - if I only ...
5
votes
2answers
10k views

How can I disassemble an iPhone 4 battery without damaging it?

I would like to measure the power consumption of an iPhone 4 using a source/measurement unit. On other devices I am able to connect the SMU directly to the +/- battery terminals, using tape to ...
5
votes
1answer
5k 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 ...
4
votes
7answers
6k views

iPhone hardware serial port access

Does anyone know how to access the iPhone's serial port, from a program on the iPod to allow that application to send signals. The idea is that the iPod could be used as the brain for some kind of ...
4
votes
3answers
4k views

IR to audio converter (frequency and level)?

What kind of IR detector and converter circuit could be used to down-convert an IR remote signal (in the neighborhood of 35 to 45 kHz) into audio frequency signals (0.1-20 kHz) of the appropriate ...
4
votes
3answers
5k views

Using the iPhone to control a remote controlled car via Arduino

So i started this project a while back where i made a remote controlled car that i could control with the directional buttons on my keyboard via an Arduino -> now the next step i want to do is to get ...
4
votes
4answers
2k views

Touchscreen Performance (iPhone, iPad, Android, Nexus S, etc.)

Who makes the touch screens for the iPhone or Android devices? Specifically I'm wondering what the sampling rate is for dragging, etc. that gives these devices such smooth touch and drag performance. ...
4
votes
2answers
5k views

Digital input to mobile phone headset port?

This seems to be a common smartphone project, but I haven't seen circuit diagrams with explanations. What filter network (or resistor network, or other buffering circuitry) should be used to connect ...
4
votes
1answer
382 views

Using an iPhone as a cassette recorder for 80's home computer

I've got an old 80's home computer (a Microbee) that I've just got running again. It uses cassette to save/load programs and I thought I'd see if I could use my iPhone instead of an actual cassette ...
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 ...
4
votes
2answers
10k views

line-level audio into an iPhone headset jack?

What level and/or impedance matching (or pre-amp) circuits should be used to send a line-level audio signal into the mic input ring of an iPhone headset jack with minimal distortion and/or loss?
4
votes
1answer
1k 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 ...
3
votes
2answers
2k views

Sending data through the iphone headphone jack

I recently bought a TRRS Pigtail on sparkfun and I want to have two buttons attached to one end of the cord and another end connected to the iphone in the headphone jack. I would like to be able to ...
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 ...
3
votes
2answers
3k views

How to use an audio output to generate IR frequencies

I have an idea for a project but need some help on achieving what I want to do. I want to create a device which will insert into the audio jack of my iPhone which will emit IR signals to control my ...
3
votes
1answer
927 views

Data modulation over Bluetooth headset profile?

What kind of data modulation schemes might be suitable for sending data to/from a Bluetooth audio headset? e.g. What kind of data modulation would likely survive the audio compression schemes and ...
3
votes
2answers
2k 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
1answer
9k 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 ...
3
votes
3answers
4k views

Sending data from RN-171 in adhoc mode

First, I'd like to note that I'm a software engineer by profession and haven't had anything but trivial experience in interfacing with hardware. With that said, I'm looking at getting a prototype ...
3
votes
2answers
494 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 ...
2
votes
3answers
346 views

How do I find an E.E. to partner with for a product?

I am a software developer and need to work with a partner who will design and develop a device (SIMPLE device) to interface with the iPhone hardware port. I am not sure of the best place to find such ...
2
votes
1answer
2k views

What is the most common type of accelerometers in today's smartphones?

I know there are 6 different types of sensors for measuring acceleration: Capacitive Piezoelectric Piezoresistive Hall Effect Magnetoresistive Heat transfer-based I have trouble finding a source ...
2
votes
1answer
7k views

Microphone voltage on a 3,5mm PC microphone/headphone jack

I bought one of those cheap cup-anemometers that you can stick into the 3.5mm headphone jack of an iPhone or Android device. I'm assuming it is some sort of pulse generator and that the app uses an ...
2
votes
2answers
4k 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.
2
votes
1answer
127 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
2answers
351 views

Serial nested if statements (Not working)

I have been trying to get this to work for a few days. What i have at the moment is TouchOSC installed on my Iphone sending commands to a processing program, which in turn simplify's them and sends ...
2
votes
2answers
1k views

How do I get a relay to recognize when a TRRS jack is plugged into my iphone?

I'm working on a project where I would like to put an aux input in my car. I was thinking of hooking up my CD changer output wires to a relay and then hook up the aux wires to the other part of the ...
2
votes
2answers
676 views

problem solving: line level to iphone attenuator buzzing sound

I'm trying to use the mic input on my iPhone to record line level audio. I have made a cable with an attenuator as shown in the picture below. Recording from my macbook pro works like a charm (3,5mm ...
2
votes
1answer
199 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
4answers
9k views

Improving throughput of a Bluetooth Low Energy Connection

Follow-Up question from Stackoverflow I am trying to write a characteristic value repeatedly over a short amount of time. Different sources tell that rates between 200 and 305 kbit / s should be ...
2
votes
1answer
7k views

How could you detect a microphone attached to a smartphone?

I've a circuit that makes sounds through an a standard audio jack (3.5mm) and I would like to connect it to a smartphone (let's say iPhone). When I connect it to an iPhone, it will be detected as ...
2
votes
2answers
6k views

Implementing a Microcontroller with an Iphone App to Control household lights?

Hello everyone I am new to microcontrollers and electronics in general, and would like to learn how I can control lights within my house via an iOS Application. How would I go about doing this...with ...
2
votes
1answer
874 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 ...
2
votes
1answer
152 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 ...
2
votes
0answers
66 views

Does iphone shock transfer AC or DC current to body? [closed]

Suppose an iphone gave a little jolt when pressing the power button. Is that AC or DC current? The phone was connected to a laptop which was connected to a power outlet.
1
vote
2answers
1k views

Interface netduino with Iphone via audio jack

I am interested in making the netduino establish a BUS connection to the IPhone via the audio jack. Does anyone have any experience doing this? I have read a few things online...but I am somewhat lost....
1
vote
2answers
2k views

How can extend the cable distance from a condenser microphone to the ADC without loosing fidelity?

I am new here so please forgive me for a vey basic question. I have a TASCAM iM2 in my possession. This is a stereo condenser microphone coupled to an ADC that connects to the the latest iPhone models ...
1
vote
3answers
1k 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?