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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24 views

Connecting the RC522 (RFID) to android phone [closed]

I want to know if this project is actually possible. Since many users have years if not decades of experience, I think this might, therefore, reduce my time spent on deciding if this project is even ...
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2answers
42 views

Connecting CDC device to Android over USB-C, with concurrent charging. A cheap option?

I'm working on a PCB to both charge an Android tablet and also allow Android to connect to the PCB via Serial port (PCB includes an ATMega8u2 configured as a CDC, supplying a Serial port). To enable ...
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16 views

Easiest way to send basic data from Android to ESP8266 through WiFi

I'm not really familiar with network protocols, but my application is very simple: The ESP8266 is connected to the phone's WiFi hotspot (so they're both on the same network). The phone sends 1 (as in ...
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42 views

Are there any sensors out there that detect how tightly a particular object is held by a human hand?

I'm trying to find a solution for quantitatively measuring the amount of tightness with which a smartphone is held by a human hand. Is there any way of using the current sensors in an Android phone to ...
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1answer
25 views

Micro USB b connection detector

Is there a way to detect if there is a Micro USB B cable physically inserted into a micro USB B receptacle, even if it is just a cable (with nothing attached to it). in android device
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31 views

How to find a compatible upgrade for a phone camera [closed]

I have a set of Android video glasses which are based on the PRIXTON C18 phone. I'd like to upgrade the camera to a better one - specifically one that supports changing the shutter speed as the ...
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1answer
41 views

STM32 BLE profiles - multiple sensors active ST BLE Sensor App

I have done the MOOC for the stm32wb55 BLE profiles and now I am trying to introduce more BLE characteristics. I managed to make the sensors work and to transmit them to the ST BLE Sensor app. However ...
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37 views

What is the appropriate unit for measuring power consumption by a section of code?

I am wanting to measure the energy consumption of running some intensive blocks of code on Android, but I am very shakey with my electricity knowledge, so I am unsure what measurements I should be ...
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52 views

How to charge an android device with a buck converter

I've got a male micro USB connector like this one I'm feeding the output of a buck converter set at 5V to pin 1 positive and pin 5 negative. Remaining pins are not connected. When I plug the ...
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36 views

How to Prevent Current Drain from an Android Phone's USB Connector? [closed]

Noob alert - I'm very much a hobbyist not a professional so doubtless fall into the 'little knowledge is a dangerous thing' category. So... I have a project which requires simultaneous charging of ...
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1answer
114 views

How to connect a line-out to mic on Android plug? (CTIA)

I want to connect line-out of a device to the microphone input of an Android phone, a Xiaomi Mi 4X. Then I can record and live stream from the phone. If I simply connect line-out left/right (red/...
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1answer
27 views

Measuring the instantaneous power consumption of phone

We can get the instantaneous current consumption and battery voltage via Android's API. So if we multiply those things, can we get the instantaneous power consumption of device? (P=V.I)
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Implement a data protocol between a smartphone and a MCU via NFC hardware?

If I'm able to develop a mobile app which is able to use the NFC hardware of a smartphone to write/read through it. And if I have a board containing a MCU and a NFC transponder like the IC from ST ...
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47 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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46 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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21 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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47 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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1answer
69 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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189 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
59 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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1answer
71 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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1answer
2k 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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1answer
70 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
682 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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113 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
56 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
84 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
594 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
389 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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170 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
39 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
101 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
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 ...
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1answer
743 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
69 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
482 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
53 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
188 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
627 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
56 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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105 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
401 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
142 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
172 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
753 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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477 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
15k 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