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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31 views

feasibility of transmitting uncompressed 16-bit PCM audio through bluetooth

I wonder about the feasibility of this idea, and whether this is something worth doing more research on. I am trying to send 16-bit 16 kHz single channel microphone audio via bluetooth, from one ...
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30 views

Why wont Micro USB Hub work with UVC Receiver?

I want to charge my phone and be able to receive wireless signal via a UVC Receiver. So I ordered a Micro USB Hub Adapter that supports OTG and charging. Well, I tested the hub adapter today, but the ...
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17 views

HC05 + Atmega32

I'm working on a project that receives one byte from Android phone through Bluetooth. And i'm using HC05 module for transmission. But the problem is i'm receiving and sending wrong chars. For now i'm ...
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28 views

Does CP2102N-QFN24 has native support for Android 8.0 or above?

I want to use CP2102N-QFN24 USB to UART chip with Android phones having API 26 and above. Does this chip has native support for Android phones with API 26 and above or need to download/install some-...
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32 views

Can smartphones connect to bluetooth mesh networks as nodes?

In an existing Bluetooth Mesh network where there are a few nodes that communicate with each other. Can an android smartphone connect to that network (where necessary) and be a part of such network as ...
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60 views

How to invert one channel of phone output?

I want to connect phone output to a car radio. It has + and - inputs. When I connect left channel to the + input, there is good quality sound, but it's not as loud as CD player. If I invert right ...
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74 views

What are the Bluetooth (low energy) scan settings of smartphones

My challenge: I'm trying to find out the best timings for a complex bluetooth low energy (BLE) system, where a central station shall be able to connect to smartphones (=scanner) as well as to coin-...
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2answers
56 views

How can I center a servo using the FT311D?

I've got a servo which requires a 50Hz signal (which can be achieved with a 20ms period) and a 1ms-2ms dutycycle. This is your standard hobby servo. 1ms dutycyle makes it go left (0 degrees) 1.5ms ...
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69 views

Can I connect an Android smartphone to an Arduino Uno? [closed]

I'd like to connect my main Android smartphone (it's a ZTE Blade X) to my Arduino Uno. My main reason is I'd like to use the camera on my phone as a sensor for the Arduino, for various projects. Is ...
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239 views

Android usb communication - How to set a non-standard baud rate for read and write data? [closed]

I would like to know if in adroid it is possible to have baud rates different from the default ones for usb communication with a pcb / arduino board, I would like to send a frame with a particular ...
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1k views

How to switch between usb host and slave mode on a micro usb programatically?

Is it possible to program some chip that can switch between USB host and slave mode over an single micro USB cable talking to an Android device? It would be OK if there was a slight pause between ...
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64 views

RN4871 auto pairing

We are developing an application which needs the BLE Peripheral to be automatically paired with the smartphone when the smartphone is near the BLE Peripheral. We are using RN4871 Microchip BLE Board. ...
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1answer
64 views

Android NFC library - Command not recognized

To access more than 2kb of data from TI Rf430 transponder IC, a custom command (0xC0) in specific format needs to be sent. On sending the custom command, command not recognized (0x01) is the response ...
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1answer
529 views

How to send data to an ESP32 with as little delay as possible from an Android app [closed]

I have an ESP32 module. I want to send data to it using an Android app. I tried using http but the delay is big especially since I want to send about 20 values per second with a delay between 50 to ...
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1answer
40 views

What are the optimal methods for controlling specific header pins via Micro-USB?

Besides buying a Raspberry Pi with GPIO, what is involved in creating a circuit board that can send data to specific pins through a micro-USB cable, as well as read from data from sensors? I am open ...
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2answers
90 views

Read temperature sensor from microcontroller to Android application (via microUSB)

I'm working on a concept for a project, and I'm having difficulty determining whether this application is possible. I will have some misc. microcontroller with an attached temperature sensor, and ...
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1answer
52 views

Different I/O pins of same PORT of ATMEGA8 not providing exact output [closed]

I have written code to switch ON/OFF some LED light connected different I/O pins of same PORT (i.e PORTD) of atmega8 microcontroller. This process is performed using android app by sending different ...
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1answer
81 views

Would it be energy efficient for phones to include actual GPS chip? [closed]

None of the smartphones today have dedicated GPS chips in them, they only have a GPS capability that stems from byproduct features of the modem chips. Because of that, the GPS capability is very ...
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1answer
437 views

Can I control/read an RFID reader with an Android device or do I have to put an Arduino board between the two? [closed]

I want to develop and Android app the reads RFID tags. I am wondering if I can control the RFID reader directly with an Android device or do I have to put an Arduino board between the two. The RFID ...
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3answers
297 views

Linking Android phone to motorcycle helmet comm set

I have a little mystery for you... I want to connect my motorcycle helmet communication set to my Android phone, including the push-to-talk (PTT) functionality. This is a simple wired setup, not ...
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129 views

RS-232 signals on Bluetooth modules like HC-06, HM-10, etc

I would like to access any I/O pins of a bluetooth module of the likes of HC-06, HM-10 or their clones from both a Windows PC and/or Android system connected wirelessly to the module. I need Windows ...
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31 views

Were to find device information about their rated processing use limitations

I'm an engineer working with device drivers+firmware. Have no much knowledge about the mobile device processing walls and hardware and limitations. I have to do some engineering testing with ...
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1answer
37 views

Audio jack Buttons [duplicate]

How many more buttons can one add through the audiojack of android phone ? I know about the cicuit of play/pause , skip Forward and skip Backward Button ...But can we add more Buttons by the ...
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1answer
96 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
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1answer
2k 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 ...
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1answer
512 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
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1answer
65 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: ...
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2answers
426 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 ...
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1answer
46 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 ...
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1answer
176 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 ...
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1answer
467 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 ...
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1answer
55 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 ...
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83 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 ...
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1answer
206 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 ...
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1answer
124 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 ...
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2answers
161 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 ...
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2answers
704 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 ...
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425 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 ...
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1answer
13k 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
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1answer
316 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)?
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1answer
649 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 ...
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1answer
292 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-...
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46 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 ...
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2answers
1k 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 ...
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1answer
49 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 ...
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3answers
786 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 ...
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2answers
338 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 ...
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1answer
48 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 ...
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1answer
100 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 ...
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1answer
63 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 ...