visual impairment
PROTOTYPE
Functional Prototype
The functional prototype will display the main parts of the scanner.
1. The camera that will scan a product
2. The speaker that names the product and the expiration date.
3. The Motion sensor that is connected to a light
4. The "lost" button that can be pressed when the scanner is missing.
functional Prototype of the scanner with all cables and part showing .
In depth
The prototype was divided in two parts in which each part contains two functions.
This part as showed above contains the scanner and speaker.
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The camera scanner was made out of a RFID scanner and the card that will be scanned will represent the product that needs to be named. This was then connected to a mp3 player and a speaker o whenever the card is scanned the speaker will play a prerecorded audio saying "milk 10 10 21".
This breadboard contained the motion sensor and the lost and found button.
The motion sensor was build out of an ultra sonic sensor that is connected to an LDE so whenever there is an object closer than 25 cm in front of the sensor the light will turn on.
Furthermore there is the "lost" button that is supposed to be on the charger, that when pressed will send a signal to the scanner which will start making noise.
Test Plan
For Testing it will be conducted first with different sighted participants to hear their opinion on the reaction time of the scanner and the audio. For example if it took to long for the audio to start.
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Another test would be to see how often and how long the users need to turn the product until the scanner scans it. This test will be conducted with visually impaired people and people wearing a blindfold. They will get a milk bottle, a round juice bottle and cheese in a package with a card (that represents the barcode) attached to it.
The second prototype will be tested by placing an object object in front of the echo sensor and testing the which distance is the most computable to be able to hold both the scanner and the product while the complete product is still showing. This way we can evaluate the distance when the light and the vibrations of the product should start.