# Title Team Members TA Documents Sponsor
11 Bill Tech Dollar Sorter
Javier Martinez Linera
Justin Hsieh
Pratheek Eravelli
Jeff Chang design_document2.pdf

Pre2, jhsieh6, javierm7


In the United States paper currency has no tactile differentiation between bills. For those with visual impairments this can be a big problem especially for those who live alone. At the end of the day when someone makes several transactions with a known amount of currency (let us say for example, that they go out with 4 twenty dollar bills), the amount of money remaining needs to be sorted and put into easily identifiable places for someone with visual impairment to access.
This problem only exists for paper currency as coins already have different shapes and their edges feel different so they are more easily identifiable.

- Machine can sort through a stack of assorted bills and return a dollar amount
- Bills get sorted into compartments
- Machine designed to be a desktop device
- Powered from wall outlet

The first solution doesn't need to be a mobile solution as it would be a device that stays at home while the user goes throughout their day. This device could come with other features so that it isn't just a money sorter, but it should be able to succeed in this specific aspect. This project would not be considered a success if it wasn't able to accurately sort and identify bills.
The user puts a random assortment of bills into the device. The user then presses a button which initiates the counting and sorting mechanisms.

The mechanism works as follows:

Each of the individual bills is rolled one at a time into the device and the camera is used to “scan” the bill while image recognition is used to identify the bill. The physical sorting mechanism of the device uses the classification from the image recognition to place the bill in the proper container. As this process occurs after each bill is individually sorted and scanned the product should produce some sort of either haptic feedback, or sound to tell the user that 1 bill has been processed. Once the entire stack of bills is processed a different sound will alert the user that their transaction has finished and the device will read out the final sorted amount.


- Camera to identify bills
- Motor to extract singular bill from stack
- Button to start machine
- Speaker to read out deposit
- Microprocessor to identify bills

RFI Detector

Jamie Brunskill, Tyler Shaw, Kyle Stevens

RFI Detector

Featured Project

Problem Statement:

Radio frequency interference from cell phones disrupts measurements at the radio observatory in Arecibo, Puerto Rico. Many visitors do not comply when asked to turn their phones off or put them in airplane mode.


We are planning to design a handheld device that will be able to detect radio frequency interference from cell phones from approximately one meter away. This will allow someone to determine if a phone has been turned off or is in airplane mode.

The device will feature an RF front end consisting of antennas, filters, and matching networks. Multiple receiver chains may be used for different bands if necessary. They will feed into a detection circuit that will determine if the power within a given band is above a certain threshold. This information will be sent to a microcontroller that will provide visual/audible user feedback.

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