Questions tagged [android]

Linux-based Operating System running a Dalvik Virtual Machine produced by Google, typically seen in portable devices such as cellphones, e-book readers, tablets, etc. Not to be confused with Androids in the robotics sense.

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28
votes
1answer
44k views

How do volume control headphones work?

A recent question over on Android Enthusiasts got me to wondering how volume control headphones work. I don't mean volume control which works by attenuating the incoming signal, but the kind of ...
22
votes
4answers
30k views

What protocol does a headphone jack use?

I have 2 questions. One is simple, the other may be not. 1. What's the official name for the standard headphone jack? It's universal for all brands of phones, so it must have a name (when you want ...
14
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7answers
839 views

Is there any kit for android development?

Is there any kit or board on which I can test out customized android os?
10
votes
5answers
10k views

Arduino or PIC microcontroller?

I was thinking of creating a surveillance mobile robot. And I am having a problem of choosing a PIC or a Arduino microcontroller. The surveillance mobile robot is controlled via wireless fidelity (Wi-...
9
votes
2answers
4k views

How to make a fingerprint scanner (UART, Serial) for a headphone jack on Android?

Square up reads magnetic stripe cards through headphone jack on both Android and iOS. I want to capture fingerprints on an Android phone. Can I develop a hardware to capture fingerprints in the same ...
7
votes
1answer
1k views

Arduino ADK + Android LED blink example compiling errors

I'm trying to make a project using the Arduino ADK board and a Sony Ericsson Xperia Play running Android 2.3.4. For starters all I want to do is blink a LED from my Android device, using the nice ...
6
votes
5answers
4k views

Accessories for Android devices with USB host

The Android Accessory SDK relies on the accessory having USB host. However, my understanding is that newer versions of Android (3.1, 2.4?) have USB host support in the kernel. And I know many ...
5
votes
4answers
929 views

Audio signal trying to go back to zero zeroes

I created a two differrent signals on my android phone, one to act as the clock signal (lower signal), and the other to be the data signal (lower signal), but the problem is that the audio the signal ...
5
votes
5answers
776 views

MCU + Linux + Video?

How can I create an device running Linux (Android OS) with video output? PS. I don't want to use an existing very sophisticated dev board, I want to create one. Thanks!
5
votes
1answer
17k views

how to use my smartphone as oscilloscope

i found this circuit that can make my laptop work as oscilloscope can this circuit work with my android phone while am using this app https://play.google.com/store/apps/details?id=com.nfx.noscpro
5
votes
3answers
4k views

Control robot with Android phone

Basically we're building a simple setup with an Arduino board and some motors. The Arduino with motor shield will control several servo motors and DC motors, and possibly talk to a few sensors. This ...
5
votes
1answer
974 views

Can Type-C device be configured as “Sourcing Device” without Power Delivery protocol?

I'm designing a device, that will be connected to various Android devices with either microUSB B or USB C receptables (in order to make it futureproof) and will be exposing some irrevelant ICs to the ...
5
votes
1answer
10k views

How can I send video from my Arduino camera module video to my Android screen?

I'm trying to connect a camera module to my Arduino Mega, connect my Mega to my Android phone (throught BlueTooth or other), and send the live view of the camera to the mobile phone. I saw a video ...
5
votes
2answers
3k views

Arduino + Android : Communicate with a JY-MCU Module

I am trying to turn ON and OFF a LED with my Android Device through a Bluetooth module (JY-MCU V1.05), I can connect to the module with the key "1234", but when I send a command to the module through ...
5
votes
1answer
2k views

Communication between Microchip PIC24F & Android device

I am working on Microchip with Android Application via Android USB framework. Currently, I have written a while loop to generate the random number continually. It is possible to retrieve the random ...
5
votes
1answer
653 views

Arduino to Android serial communication issue

I've been trying to use this serial for android library now, but I can't make it work. I'm trying to run this little program in android: ...
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
3answers
968 views

Proximity Sensor Nexus S

Can someone tell me how the proximity sensor on the Nexus S works or what it is?
4
votes
1answer
2k views

Teensy usb keyboard + Android

I've just gotten one of these Teensy boards: http://www.pjrc.com/store/teensy_pins.html I am trying to set it up using the basic keyboards tutorial. It is working correctly on Windows PC devices when ...
4
votes
2answers
3k views

Is there any way to differentiate the sound of blowing air from normal sound through phone microphone?

I have been working on an Android app that takes input from microphone when user blows into it. I am using FFT based sound analysis and converting the values in frequency by using a zero crossing ...
4
votes
2answers
2k views

RN41 Bluetooth module with MSP430 to Android device

I have an RN-41 bluetooth module connected to an MSP430. I want to connect the RN-41 to an Android cellphone. Just by having power to the Bluetooth module, the cellphone finds the device. However, it ...
4
votes
1answer
542 views

Android Home Automation

I'm trying to do home automation using android app and arduino teleduino. Basically, I'll be doing lights and power plugs. I still cant post images so here' the link to the diagram I saw and will be ...
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
6answers
18k views

DIY NFC boosting antenna for a mobile device

I am very new to this. I'm a dentist trying to improve client flow in a busy office. I would like to develop a cheap proof of concept for an NFC enabled client tracking system using a hacked mobile ...
4
votes
1answer
2k views

Using Android Accesory mode to access a USB serial device, use a VNC2?

In a current project we use an Android application that talks to a USB Serial device (which speaks the Prolific USB serial protocol). This works fine with Android devices that support USB Host Mode, ...
3
votes
2answers
4k views

ATTiny85 and USB with Android?

I have developed an Android app which talks to an Arduino Mega through USB. The C code is 1.8kb and will fit on an ATTiny85 chip in order to shrink the circuit to almost nothing. The problem is... ...
3
votes
3answers
1k views

Use USB as an on-off switch

I'm looking for a way to build a zero(ish) cost intervalometer for my Canon SLR using only stuff that I have or can get very cheaply (my budget is about $4). I've already managed to "build" a wired ...
3
votes
2answers
4k views

Adding bluetooth to msp430

I was wondering, what is the best option to add bluetooth connectivity to a small msp430 project. I have tried to google this, and have found various resources, but I am not sure which ones to go with....
3
votes
3answers
2k views

What is the audio voltage of an android phone?

For a project I am currently working on, I need to use the audio output of an android device. Is there a standard max voltage?
3
votes
3answers
27k views

Is it possible to create an HDMI input adapter for android?

Would it be possible to stream a video signal into an android device? I understand that the HDMI port it's self is not designed to take input, so I was thinking that the data could be streamed via the ...
3
votes
2answers
258 views

How to connect one Android mobile audio output to the microphone of another Android mobile?

This question is to help the "hard of hearing community" so that they can READ the phone/mobile call because they can not hear it. Android has some really good (and free, too) apps which can ...
3
votes
1answer
143 views

Reading Flow Meters from Mic Port

I am attempting to read two hall-effect flow meters through the audio-in (mic) port of an Android device. I want to be able to read both flow meters independently. The audio-in port is a standard ...
3
votes
1answer
923 views

Android Microchip Accessory Development Starter kit PIC24F

I have the PIC24F Android Accessory Development Starter Kit from Microchip. I am running Android 4.4.2 on a Samsung Galaxy S4, however I am unable to get the phone to recognize the USB device when ...
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
2answers
2k views

How to amplify a 3.5mm headphone analog signal?

I have made a circuit like described at this site but the sound I receive through the mic sensor is not very high. Can I add some Opamp circuits to increase the analog data input in android phone?? (...
3
votes
2answers
1k views

Microchip PIC24F & Android device: Which can be host device?

I work on a project where I want to connect PIC24F (Accessory Development Kit for Android www.microchip.com/android) and Samsung Galaxy S2 that I updated from android 2.3.3 to android version 2.3.4. I ...
3
votes
2answers
354 views

Is there a good and reasonably priced way to make a custom RFID reader and barcode scanner that runs Android?

I'm building a system for a small manufacturing business that requires a mobile barcode scanner (at minimum) and would be great if it could be an RFID reader too. I would really like this to be a ...
2
votes
3answers
35k views

Simplest Way to Connect an Arduino to Android (Wirelessly)?

I want to control a simple Light on an Arduino from my Android. The Arduino I have down pat, no problem. However without using Bluetooth on my Android, whats the simplest way to actually connect it (...
2
votes
1answer
622 views

Where to find the data sheet for Huawei Honor 6 smartphone?

The smartphone seems to have bq24190 chip for power and charging control (according to /sys/), for which the data sheet specifies that it can be powered not only ...
2
votes
2answers
8k views

A Bluetooth device that will send data to a mobile phone

I want to make a device which will send a data to a mobile phone which is connected using Bluetooth. Here is the thing: http://www.youtube.com/watch?v=g0qARDGJj1w. I want something like this. The ...
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
2answers
821 views

Why would credit card reader over audio jack not work on some devices?

This isn't a troubleshooting question, it's purely to satisfy my curiosity... MagTek makes a product called the uDynamo credit card reader that uses the audio channel on android devices as a ...
2
votes
3answers
1k views

Android Device Using Buck Converter (Voltage Regulator) instead of Li-Ion Battery

I have a project that is basically replacing my car's instrument panel with an Android device (a tablet). I managed to make everything work except for one thing: the Li-Ion battery of the tablet was ...
2
votes
1answer
631 views

Android fails to detect FTDI chip

I want to connect FT232R chip to android phone. I have downloaded FTDI terminal for android from https://play.google.com/store/apps/details?id=com.ftdi.j2xx.hyperterm FTDI program has to ...
2
votes
2answers
37k views

Replace a three wire tablet battery with a two wire one

I want to replace an old 300 mAh battery in my Chinese tablet with a new 3000 mAh one. The old battery has three wires: red, black and white. The white wire connects to a pad on tablet's mainboard ...
2
votes
1answer
287 views

How to do a DIY LCD output from a busted android tablet?

I have a cheap android tablet with a busted screen. Replacement screens cost more than a new tablet and I hate to waste it since it's only a few weeks old. I took it apart and it runs on a Allwinner ...
2
votes
2answers
177 views

Android to arduino- best board option for wireless [closed]

I'm a novice arduino hacker. I need to connect a hacked Android to an arduino wirelessly but unclear as to which option is best. I've read about the Mega ADK and it is my understanding that a regular ...
2
votes
1answer
7k views

Is it possible to intercept the audio data of voice call in Android? [closed]

To my konwledge, the (voice call) audio data from micphone will be sent to PCM module for resampling, then to modem for coding before sending to air.I am here for asking in Android is it possible to ...
2
votes
1answer
2k views

Can Original Arduino Mega 2560 Work with Google ADK?

Stupid question fellow Stack users... Can I use Google's ADK on the original Arduino Mega 2560? From what I can tell, the main difference between the Mega2560 and the Arduino ADK is the addition of ...
2
votes
1answer
172 views

Need help identifying some sort of “wire”

I just disassembled my Android Galaxy S in attempt to create something like the iPhones physical sound on\off switch. This is how the unplugged speaker looks like: Until now I have learned the ...

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