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Wifi-Direct has not been widely used yet, even with inclusion into Android 4.0. You will not find any direct modules for the Arduino that support wifi-direct. …

Normal cell phone or tablet usb ports will not output a voltage on the usb VUSB/VCC or GND pins. OTG usb ports, if supported by the phone, need to be enabled by grounding the ID or Sense pin, before i …

Depends on the phone. They started using NAND, raw flash accessed directly. Then they moved to eMMC, NAND with an embedded controller for better performance. Recently, many have moved to newwer genera …

You might find someone to give you a discount on 50 premade android devices, but it would probably not be a very big discount, maybe covering shipping. … This will limit you to android cell phones. You could find android devices without screens for much cheaper, then add a usb touchscreen separately. …

Powering a peripheral from an android device depends on the hardware and the firmware of the device in question. Android the OS is not what enables it. …

Both of these require server code on the arduino to control the shield and receive the data from your Android phone or device. Example: Arduino Wifi Web Server Pretty much drop in and go. …

Commonly used in arduino projects between an arduino board and iphones or android phones. …

The third option is a computer (or hacked router) with a serial connection to the arduino, and a program to communicate via wifi with the Android device. This adds an extra layer of complications. …

In theory, it should. In practice, it depends on the actual phone design, and your setup. You can always invert the PIR output if it's not logic high. But a better idea is simply using a motion detect …

As for usb on most older Android phones, if it doesn't have host mode, you can't do it without an middle man like a usb microcontroller. …

Can a USB audio class 1 device interface with an associated Android application via AOA? No. The UAC1 is a Host implementation, the Android device acts as a OTG Host to a usb audio device. … Most android devices (if not all) will not be capable of acting as both on the same bus. Some android devices have multiple usb ports, including one for OTG Host and another for Slave. …

Maybe. Most phones do not have audio over usb. Some do, but it's rare. My phone, a Samsung Avant, has a dock cable that allows usb charging and audio and video out over USB. It would be more likely …

Microcontroller measuring a hall effect sensor, a magnet, and a bluetooth module. Hall effect sensors measure magnetic forces, and are solid state devices. Unlike mechanical relays, they have very hi …

Keep in mind the Wired Audio Headset Specification is for devices to conform to Android Specs. … It is required that android devices support the feature, not a requirement that the headset have the feature. Even then, it's just "strongly recommended" that the device support it. …

USB has sleep/suspend mode options. Conceivably, the phone has received the suspend signal over the data pair, and stops charging. This is very much dependent on the phone, the computer's hardware des …