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.

Filter by
Sorted by
Tagged with
-3
votes
1answer
134 views

What amperage Android sends to jack 3.5?

I want to use signal of Android's jack 3.5 as key for my circuit. For this reason I want to know amperage and voltage which Android can send to this port
0
votes
1answer
3k views

I want to get data from my NodeMCU to my android application [closed]

I have a NodeMCU which is connected to 4 LEDs. If i hit a URL like 192.168.1.2/relay1on then my relay 1 gets switched on and the LED connected to it lightens up. What i want to do is i want to know ...
-1
votes
1answer
1k views

OTG + simultaneous charging with USB Type-C cable?

This video shows how to make it with a Micro USB. Is it possible to make the same thing with USB Type-C ? My phone has OTG host function. Thanks! http://youtube.com/watch?v=pH895umr0UA&t=8m43s
2
votes
1answer
71 views

Does Quick Charge have an effect on battery lifespan?

When charging my phone (a Samsung Galaxy Note 4 using a 3,220mAh lithium-ion battery) I have the option of charging it with with a standard charger or a Quick Charge 3.0 charger. Quick Charge is a: ...
0
votes
2answers
518 views

Replacing the relay in my circuit

I have this delay circuit. I am trying to delay the power to R1(which will be an android phone) by 1 second. SW10 is my SPST relay. Can i replace the relay with something cheaper and physically ...
0
votes
1answer
64 views

rc circuit for delay to charge android phone

I have made this circuit such that once switched on it takes about 7 seconds to get to 5Vs. I want to connect my phone to it (replace voltmeter in circuit with phone). Without the phone being ...
1
vote
1answer
196 views

AXP209 : Usage without ACIN?

I'm currently bulding and Android device and I've got a question which can't get answered. The AXP209 is an IPS and power manager. It allow the usage and charge of a standard lipo. It has two inputs ...
5
votes
1answer
973 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 ...
-1
votes
1answer
60 views

How to send data from simple digital device to an Android application wirelessly?

I am trying to find a way to send measurements from a digital device (as the blood pressure device) to a mobile application that can analyse these data ..... How to send these measurements wireless ...
0
votes
0answers
115 views

Wiring a switch to a BlueTooth transceiver

Please note: Because this question is concerned with integrating a BlueTooth chip to a PCB and a remote device, I do believe this is an electronics question at heart. I have an experimental/hobby ...
-2
votes
1answer
637 views

Ghost screen in the background…like water mark in my cell phone screen [closed]

I'm using Moto G4 plus bought during Feb'17.I have been noting this problem for a few weeks.If I stay long in a screen for eg. a chess game, the screen stays on all the following screens in the ...
0
votes
1answer
169 views

Switching low power with transistor

I'm looking to simulate click of a button (short circuit) on Android phone. I plan to use Arduino pro micro (5v) to trigger "the click". What kind of transistor should I use? Maybe there is some ...
0
votes
2answers
176 views

BTLE synchronize advertising beacons with phone scanning

In a BTLE master/slave connection, the master and slave devices synchronize their frequency hopping. Along with the connection parameters (like interval, slave latency, supervision timeout) this ...
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 ...
0
votes
0answers
567 views

How to simulate headset button presses (TRRS jack) using a MCU?

I have a little project where I'm trying to control the music playback (play/pause/next/...) on an Android tablet from a Microchip PIC18F MCU. The tablet has a TRRS mini-jack interface for sound ...
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
0
votes
1answer
475 views

What is the type of chip commonly used in android device as internal memory?

What is the type of chip commonly used in android device as internal memory? Where the operating system resides, and often show up as sdcard0 (correct me if I'm wrong)?
0
votes
1answer
982 views

Android USB Accessory as a Device?

The Android AOA specification states that When the Android-powered device is in host mode, it acts as the USB host and powers the bus. and When the Android-powered device is in USB accessory ...
0
votes
1answer
370 views

USB Host - Host (PC) from Android

I am trying to design the following. My Android device (and the applications processor on board) has a limitation of a single USB PHY only. Here is my goal. I have to support the Android box in USB-...
0
votes
0answers
51 views

XBee | Ubuntu (C/C++) | Android

I am looking for guidance of wireless communication between Ubuntu (code written in C/C++) with an Android device. Since the desired range is about 1 mile (~1.5 km), I assume that XBee Pro would be a ...
0
votes
2answers
2k views

USB charger - tell the phone it can draw more power [duplicate]

I have 8A 6port usb charger. It has two ports marked as fast charing, and the phone here actually charges faster than in the two other ports. When I dismantled it, all the USBs were on the same power ...
0
votes
1answer
51 views

Can I use a separate power supply to charge the phone while working with a IOIO board?

The current I get from the IOIO to charge the phone (500mA) is too low for my application (I need it to run for a long time, and the battery drains). I was thinking of taking apart the cable (the red ...
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 ...
1
vote
2answers
420 views

Android ATtiny arbitrary data communication over USB [closed]

I have an ATtiny13a running code at 9.6 MHz (internal oscillator) for single pin Tx Rx half-duplex serial port at 115200 baud rate using a lib which I found online Using FTDI 232RL or BT HC-06 in ...
0
votes
1answer
50 views

Safety considerations in Android Wear products using high resistance electrodes

I am wondering how wristlet devices can safely measure a person's heartbeat without risk of electric shock. It seems everywhere I read, the threat of static discharge would be far greater with an ...
-3
votes
1answer
102 views

IC 34825 for USB interfacing

I wanted to interface an LED circuit with smartphones without microcontrollers. Research showed that IC 34825, a 20-pin IC can be used for the interfacing purpose. Also an evaluation board for the ...
0
votes
1answer
66 views

USB male android to audio output [closed]

I was curious if I could possibly strip the end of a USB cable, and direct audio traffic from the phone through the USB to a 5volt in p/n speaker, sub, or a tweeter. I haven't seen this done anywhere ...
0
votes
1answer
387 views

Smartphone camera wired trigger over audio

I'm trying to build for myself a smartphone camera wired trigger over audio input/output port (a.k.a. 3.5 mm jack used for heaphones/headsets). I'm completely lacking electronic engineering skills (...
0
votes
1answer
440 views

Force microphone on TRRS connector without a mic connected

I have a TRRS connector for my Android phone. I want to be able to enable/disable the mic on the cable using a button. So for this I have connected a 1.2 kOhm resistor to a button and when its 'on' ...
2
votes
0answers
1k views

HTC 10 DAC/amp specifications

I'm going to be doing a final year project revolving around music production and DACs are pretty important. Not going to go into detail (unless this question requires it) what the project is but I ...
1
vote
1answer
133 views

Read USB Input on Android from IR sensor

A mainstream IR sensor has 3 pinouts: Vcc: 5V power GND: Reference ground Vo: Analog/Digital voltage output One can power the sensor using phone's mini USB's Vbus and GND (Can one?). Can one then ...
0
votes
1answer
146 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 ...
0
votes
3answers
1k views

Control DC MOTOR from headphone

I would to know if is possible with simply way ( i'm not electronic expert ) to drive one direction a DC MOTOR ( a little ) from headphone, with power supply of course. The difficulty is voltage of ...
1
vote
0answers
6k views

Why is my RGB LED Strip only lighting green?

I am trying a project by Make Magazine which allows me to send color values from an android phone to an Arduino and light up the strip. I am having trouble because the strip is only lighting up green ...
-5
votes
1answer
2k views

Android USB OTG [duplicate]

How to measure voltage at micro usb port on android with multimeter???I connected black wire to the ground pin and red wire to VBUS but is not showing anything on display. Connector is connected to ...
0
votes
3answers
873 views

Simulate Gyroscope through MEMS accelerometer

Is possible to simulate the Gyroscope using Accelerometer values? I would like to make that in Android Context so using MEMS smartphone accelerometer.
-1
votes
1answer
2k views

Transferring battery energy form phone to phone [closed]

Is there a way to transfer the battery energy form a phone to another phone? I've seen it be done by using a USB to microusb adapter + USB to microusb cable like show in this video. Can I create an ...
-1
votes
1answer
74 views

How do wearables track exercises without taking input from user?

Recently there have been wearable devices that can track your exercises and reps (eg bench press, push ups, pull ups) without the user telling them. What technology do they use to track these ...
0
votes
1answer
322 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
373 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. ...
0
votes
1answer
1k views

FTDI d2xx driver not reading bytes on Android to communicate with MDB board to Vending Machine

When trying the D2xx driver from FTDI, there was no bytes being read by Android Device. Below are the codes: when opening a port to use (since only 1 port in android it is default to the first port ...
0
votes
2answers
548 views

compatibility of Bluetooth module and Android devices

I'd like to connect a Bluetooth module to PIC to communicate with Android devices what is the property that determines the compatibility between them , i could not find anything in the web from ...
1
vote
1answer
132 views

How would you jerry-rig an android phone for continuous autonomous operation?

I want to use an android phone as dash-cam with GPS tracking capabilities. It is supposed to run 24 hours a day, 365 days a year. If the phone / app hangs, the user cannot be expected to ...
0
votes
4answers
1k views

How could I read a digital input (an open/closed switch) from a smartphone without a digitizing board?

I have to read a single digital input signal (a trivial open/closed-circuit push button) and use this signal in an Android application on a smartphone. Of course, I could connect a tiny Arduino-like ...
-2
votes
1answer
929 views

Android ble device issue with rssi and connectivity [closed]

I am working on android ble using nordic. I have few issues: I see rssi strength of device in dBm like -88 dBm, -77dBm which value is good for proper working as it is in negative so bit confusing to ...
0
votes
1answer
278 views

Read AS3953 NFC EEPROM when the chip is not supplied

I want to read/write AS3953 (NFC chip) through SPI (MSP430) and PCD (Samsung Galaxy S3 Mini). No problem for the first part (through MSP430 SPI). but when I want to read EEPROM values trough PCD, I ...
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 ...
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 ...
0
votes
1answer
478 views

Data transfer to Android USB Digital Audio device

Android 5.0 (API level 21) and above supports a subset of USB audio class 1 (UAC1) features: https://source.android.com/devices/audio/usb.html related links: https://source.android.com/accessories/...
1
vote
1answer
1k views

use of mobile phone as multimeter [closed]

Is it possible to use mobile phone as sensor for measuring conductivity of a medium? My aim is to avoid any external hardware. The two input channels can be used as 3.5mm microphone jack or USB.