I wish to build a simple headless device, powered by a 9 V battery that allows a person to speak into it upon touch. The device would then capture to allow "speech to text" functionality and, subsequently, have that text sent over Wi-Fi, to my server.
My background is in Android development and I can handle the necessary programming, but I have very little background in the hardware side. In short, I do know I need a microphone, Wi-Fi transmitter, possibly Bluetooth to allow the device to link to mobile device for Wi-Fi login information, and bare bones microcontroller (way less than an Arduino given the specific functionality).
I am very new to this. Can such products be purchased for around $20 total? Or perhaps a unit with all features outlined above aside from the speech-to-text logic? Where?