This is a tuner that is made specifically for blind people. It uses audio feedback to tell you if a string is too high or too low.
After turning it on, the tuner will be set to the low E string. Holding the button cycles through all 6 strings in standard guitar tuning.
A pattern of beeps is played continuously. Low-high indicates the string is too low. High-low indicates the string is too high. A single beep indicates the string is tuned.
The current prototypes are circuit boards slightly smaller than a credit card. Going around the edge clockwise there is a 9V battery connector wire(bottom left), the power switch(left), a push button for changing the current string, a piezzo buzzer(top left), the microphone amplification circuit(top right), the microphone(right), the microcontroller(bottom right), a 6-ping programming header(bottom), and then we're back at the start. In the middle is a voltage regulator for powering the microcontroller.
This project started from a random encounter on Reddit and some free time. This is the second product I'm selling on Tindie and the first ever designed for blind people.
It is very much an early prototype, so your feedback is essential in turning this into a product worthy of production. Please contact me if you have any questions, problems, or suggestions.
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Digital Developer and Hardware Hacker by day and by night.