Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [iphone]

Questions about iPhone's hardware and interfacing circuits to iPhone

138 questions
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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 phone will produce a large AC voltage, but how large…
manuelBetancurt
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4 answers

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 original headset microphone with another microphone,…
user11678
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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 a specific part of the iPhone at a specific…
Juffo-Wup
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2 answers

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, 18, 19, 20, 25, 26, 27, 28, 29, 30 LG G4: 1, 2,…
Jean
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1 answer

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 device. It kind of resembles an RFID tag. Can anyone…
runeb
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4 answers

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 does not detect that a mic is even plugged in.…
Connor
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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 conclusion that by simply grounding e.g. A carrot or…
zakgottlieb
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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 iPhone. I installed OpenSSH on the iPhone, and…
ipatch
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4 answers

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, Android). What is the approach used in such…
alexey
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1 answer

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 headphone jack Start app Input setting for adapter -…
Saif Akhtar
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7 answers

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 robot by using the serial port to tell an arduino…
zklapow
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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 above: For communication from the Arduino to the…
miguelrios
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2 answers

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 use the most basic commands of 4 to just 'know' if…
user1459408
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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 phone’s 2.2V microphone line (between pins 1 and…
Ben
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3 answers

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 managed to get it to work, I've since learned that it's…
Brad Robinson
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