Members

Phillip Bozzay, Electrical Engineering Student (2027) [email protected]

Brady Falk, Computer Engineering Student (2027) [email protected]

Mentor

Eddie Pritchard Yousef Chebil Nicholas Pacheck

Current Status

IN THE WORKS NOW

Project Overview

Analog radio (100MHz) with a digital interface. Custom design, PCB design education value is custom RF pcb design and research of relevant components

Educational Value Added

PCB design education value is custom RF pcb design and research of relevant components

Tasks

Design Decisions

General Design Layout: https://docs.google.com/drawings/d/1e5mTtKONOJFI6KM5OiUcPPun2-vZfV_UhMkgm8joVLU/edit?pli=1

• The General design is an analog radio with a digital display
• The radio receiver circuit will be designed for signals between 90 MHz and 107 MHz
• The user will be able to tune the channel via variable capacitor
• A switch will configure the audio input circuit to radio input / regular audio input (cable)
• User will be able to adjust the volume and equalize the audio using potentiometers
• The audio circuit will drive a low resistance speaker
• Spectrogram, and more information will be visible via SPI display

Digital Display: https://docs.google.com/drawings/d/1l0TOMat3e_Cb2plj9UsGKdRVyu4xmmN-r_CkISbyUpM/edit?pli=1

• Display FFT information
• Display FM channel

SPI Display Driver Circuit https://docs.google.com/drawings/d/1E67qR3yuNH56lItT9SU0MOQwrdpFbPqokMBX5DFpPCU/edit?pli=1

• The 2.8" TFT SPI display requires the the GPIO inputs be logic shifted from 5 volts to 3.3 volts
• This is a simple voltage divider
• Implementing this on a breadboard is quite messy, so the goal is to put this on a PCB chip
• This driver circuit will be general purpose, not specific to this particular use case

External Memory Circuit https://docs.google.com/drawings/d/11PcZ85OOiS_0Ki8MvOQhEjBIvRu9X47G4qPSfKRWTIE/edit?pli=1

• The arduino uno only has 2kb of SRAM.
• the arduino would require a minimum of 10kb of SRAM (rough estimate) in order to compute and display a low resolution FFT
• This circuit outsources the SRAM to an external chip, which will allow for 256kb of SRAM.
• Goal is place these connections on a PCB

Design Misc

Steps for Documenting Your Design Process

BOM + Component Cost

Timeline

Useful Links

Log