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 ...
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 ...
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?
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 ...
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 ...
1
vote
1answer
1k views

USB data transfer with a separate power source

The car I recently bought has a built in USB but only provides 500mA. I want to use a cable like the one below to connect my iPhone to the built-in USB to play music/satnav on the car stereo, but I ...
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 ...
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 ...
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....
0
votes
2answers
784 views

iPhone schematic help

Could someone help me understanding the markings of this schematic? What the little numbers I circled in red and yellow are. Is c59 providing power to that entire circled area or is just two points ...
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 ...
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 ...
1
vote
1answer
5k views

How to wire sennheiser headphones to an iphone headphone cable

I have a pair of these (or something very similar) : The plug failed so I chopped it off and was hoping to wire it to a plug on a spare pair of iPhone headphones I had kicking around. Both sets of ...
1
vote
1answer
353 views

Mobile phone TRS output to microcontroller digital input?

How should a mobile phone headphone audio output (such as the headset jack on top or bottom of an iPhone) be interfaced to a microcontroller digital input? (3.3V controller. Assume no audio frequency ...
-3
votes
1answer
365 views

Am I understanding this circuit right?

This is from an iPhone 6. I'm having a hard time understanding how q1701 controls the "handshake" to Tristar_pin to allow charging. (Diagram says "pin for handshake" next to C1704 at top right.) I ...