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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How to access modem inside Android mobile from a PC through USB cable? [closed]

Every mobile has a modem inside it, which allows dialing phone numbers and connecting to data/GPRS. I guess we can send AT commands to all modems in phones. So if I tear down an Android phone e.g. a ...
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How to send AHD video wirelessly to an Android device (short range ~3m)?

I have an underwater camera (wired to the water surface) which streams AHD digital video to a RG59 connector. I would like be able to stream the video to an Android device. It doesn't have to be a ...
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Can't send more than 160 bytes to module using Bluetooth on Android

I am unable to send more than 160 bytes to a Bluetooth (BLE) module from my Android application. I am sending data from my modified FastBle Android app to a microchip RN4871 Bluetooth module. I'm ...
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Multiple simultaneous ESP32 BLE connections to one mobile device

I'm trying to find out if it's possible for at least two ESP32's to maintain active BLE connections with one Android mobile device at the same time. What I'm basically trying to do is to send analog ...
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-1 votes
2 answers
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Replace phone battery with power supply circuit BL-T5

I have an old nexus phone LG e960 I'd like to use for a project permanently connected to mains . The battery is long dead and it no longer charges. I've swapped it but the replacement didn't last long....
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Embedded Android for custom device

I am using a SOC (System on a Chip) attached to some peripherals like camera and screen. Since this is not a very common hardware setup like a Raspberry Pi where there are adapted android builds for, ...
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106 views

Temperature monitoring over Bluetooth

I bought this temperature + pressure + other things sensor that operates over bluetooth. Here it is : https://ae01.alicdn.com/kf/HTB1HebxRSzqK1RjSZFjq6zlCFXaH/Module-de-capteur-d-acc-l-ration-de-...
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Replacing phone battery with power supply

I have an old phone (nexus 5) that I want to use for a project. I need to replace the battery with a permanent power supply, I've found the 3 pins of the battery and made a breakout connection with 1/...
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Android game reccomendation for electronics

I would like someone to reccomend me a android game regarding electronics (medium or advanced level game, no low level). Backstory of the reason im not looking it up on my own: I am in the hospital ...
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2 answers
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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 ...
2 votes
1 answer
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Bluetooth receiver board into 60's console stereo Tape In

I'm looking for a bluetooth receiver board to connect to the Tape In of my 60s stereo record player console. We've used our Android phones with a 1/8" to RCA Y cable into the Tape In, and it ...
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USB vs Bluetooth power saving

I need to transfer almost all kinds of data (arrays, video/audio stream, control signals) between mcu and an Android smartphone. MCU will accumulate data from smartphone and further send it by other ...
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Smartphone Gyroscope Range (radians / second)

I'm using gyroscope recordings of Android Smartphones. The measurements are in radians / second. I recognized that sometimes there are some outliers and also the range is different between smartphones....
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Interpretation of Rotation Vector Measurements

I use android devices (Xiaomi Mi9-SE (Android 10) & Huawei P10 (Android 9)) to collect movement data from bicycle rides. Hereby, I am measuring i.a the Rotation Vector which describes the rotation ...
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android phone USB cc pin control

I'm trying to find out if there is any way to control the CC lines on a USB-C from an android app. I need to signal to my embedded gadget some event, instigated from an android app. I can't find any ...
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USB host stack for PIC32

I have a board built around a PIC32MZ that uses a FTDI 312D to communicate through tbe UART with an Android device. What kind of software do I need on the PIC32 side so I can get rid of the FTDI and ...
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Generic tablets and single board computers

I've been pondering the idea for a while now in regards to a project I've had in mind. Essentially, I was wondering how I would go about obtaining generic tablet/phone motherboard designs? Would I be ...
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Bluetooth Compatibility

In the prototype I'm working, I'm using my phone to communicate with the Bluetooth module RN4871 (https://www.microchip.com/wwwproducts/en/RN4871). Now I'm planning to buy a chinese Android industrial ...
1 vote
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42 views

Send data using USB-PD on android phones [ROOT]

USB-PD can transfer data at low speeds between devices and is quite a bit simpler than normal USB communication. Is it possible for an android app to send arbitrary USB-PD data? The phone has root ...
3 votes
3 answers
230 views

Headphone jack IR transmitter not working reliably

I'm working on a project to build a remote control app for some IR controlled toys like DeskPets, Robosapien, TOMY etc. including an IR transmitter that (hopefully) has a very high range. I built an ...
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1 answer
141 views

Connecting PIC32 through FT312D to Android tablet

I need to connect my PIC32 to an Allview Android tablet over USB so that the tablet will charge from my PIC board and also be able to communicate at the same time. I can connect the PIC32 to a FT312D ...
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Connecting a PIC32MZ with an Android tablet via USB

I have an Allview tablet running Android I want to connect to my board using USB. An application on the Android tablet would control the micro which in turn would control a bunch of relays and read ...
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Poor man's oscilloscope - more simple

In our lab we have NI cards and work with -10 to 10V. Oscilloscopes are rare and some mobile and quick-and-dirty solution would be fine for debugging. Therefore the 'poor man's oscilloscopes' that ...
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Android Tablet Side Connector Interface Information [closed]

I'm not sure if this is on topic or not, but I'm trying to find out about the interface found on the side of some Android devices. An example can be found by side of the "pipo n2" device. It ...
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can someone help me build a usb jig to force android device into recovery

Years ago i bricked a phone trying to install a ROM not designed for that phone. As a result the phone went into a bootloop and would not go into recovery mode. Researching the problem i found a ...
2 votes
2 answers
745 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 ...
2 votes
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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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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 ...
1 vote
1 answer
42 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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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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1 answer
453 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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2 answers
64 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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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 ...
2 votes
0 answers
64 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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1 answer
2k 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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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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195 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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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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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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1 vote
1 answer
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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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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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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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1 answer
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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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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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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 ...
0 votes
1 answer
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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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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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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 ...
-4 votes
1 answer
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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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