Building a DIY hearing aid with Arduino

A Maker by the name of “Ojoshi” has designed a DIY intelligent hearing aid prototype powered by an Atmel-based Arduino Mega (ATmega1280). The project, originally posted to Instructables, was recently featured on the HackADay website.

So, just how does the DIY hearing aid prototype work?

First, the platform employs an electret to capture audio, subsequently running it through a pre-amplifier to increase the gain 100x. The next stage consists of four filters – neatly dividing the input signal by frequency into four parts, which are passed into four LTC6910 programmable gain amplifiers, allowing the Arduino to control the gain of each channel. The LTC6910 then takes three digital inputs used to set the gain value.

“To determine which gain to use for each frequency band, the Arduino needs to know how much power is in each band,” explained HackADay’s Eric Evenchick. “An envelope detector averages the signal, which can be read by an analog input on the Arduino. Using this information, the hearing aid can boost specific frequencies when it detects conversation.”

As Evenchick notes, this hearing aid won’t quite fit in your ear, although there is quite a lot of interesting signal processing/action happening on the prototype.

Interested in learning more about Ojoshi’s DIY hearing aid prototype? You can check out the project’s official Instructables page here.

1 thought on “Building a DIY hearing aid with Arduino

  1. grammar check

    What features NOUNPLUS Grammar Checker can provide
    For many years, Our team has developed English grammar check engine, which is now used for our Android free grammar checker app as well.
    NOUNPLUS’s Grammar algorithm mainly focuses on two principles of Grammar, Syntax, and Morphology, identifying over 1,000 common grammatical mistakes.
    Unlike many of the grammar correctors in the market, it does not provide spell check so that we can achieve better accuracy of understanding proper nouns However, you can still use spell checker by setting the browser’s preference.



Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s