Hi, I'm Charlie

I’m Charlie Roberts, a second-year MEng Electrical and Electronics Engineering student at Imperial College London.

Proud to be a UKESF Semiconductor Talent Award Scholar, 1 of 300 in my year receiving monthly mentoring sessions and access to attend various semiconductor events and conferences.

Alongside my studies, I build electronic and software projects for fun on the side. I’ve done projects for personal and potential medical use, with some projects including custom PCBs and 3D-printed enclosures for my embedded electronics, all listed on this site.

I have worked in many projects and am familiar with the following software/tools: Python, C++, Arduino, Raspberry Pi, HTML/CSS/JavaScript, SQL, Autodesk Inventor, LTspice.

London, United Kingdom

Selected Work

Projects

UART Transceiver in Verilog

A UART transmitter and receiver (8N1) written from scratch in Verilog, built from counters, shift registers and state machines, and verified with a self-checking loopback testbench in Icarus Verilog.

Full 8N1 serial link in Verilog: a parameterised baud generator, a transmitter and a receiver
Receiver uses 16x oversampling and a two-flop synchroniser to sample every bit at its centre
Self-checking loopback testbench: 13 bytes, including a back-to-back burst, all received with zero errors
Found and fixed a start-bit timing bug that shifted every sample half a bit early

Repo ↗ Electronics 2026

ESP32 Vitals Monitor

An ESP32 reading heart rate, SpO2, body temperature, and a single-lead ECG, serving its own live dashboard over WiFi from a self-hosted access point; no router, app, or internet connection needed.

A self-contained vitals monitor: heart rate, SpO2, body temperature, and a single-lead ECG all read from one ESP32
Serves its own live dashboard straight from the board over WiFi, no router, app, or internet connection needed
Plots a live, adjustable ECG waveform on the dashboard, not just a single heart-rate number
Timestamps every ECG sample as it arrives in the browser, so the trace stays accurate even if the WiFi send rate drifts

Repo ↗ Electronics 2026

ESP32 Stabilised Spoon for Parkinson's Disease

A self-levelling spoon for hand tremor: an ESP32 fuses MPU6050 accelerometer and gyro data to hold the spoon head level with two servos, correcting roll and pitch in real time.

Built to counteract hand tremor from Parkinson's disease or essential tremor
Complementary filter fuses MPU6050 accelerometer and gyro data into a stable roll/pitch estimate
Two servos actively counter measured tilt in real time to hold the spoon head level
Boot-time auto-calibration zeroes out mounting offset in about a second

Repo ↗ Electronics 2026

ESP32 Bluetooth Speaker with FFT Spectrum Analyser and OLED

A Bluetooth speaker built around an ESP32: A2DP audio into a custom amp stage, with a live 16-band FFT spectrum and scrolling track info on an OLED.

Live 16-band FFT spectrum on an OLED, computed straight off the incoming Bluetooth audio stream
Log-spaced, self-calibrating frequency bands so quiet and loud tracks both stay readable
Custom amp stage: resistor-divider into a PAM8403 class-D amp driving two 5W speakers
Debounced volume and play/pause controls, with a mode button reserved for a planned AM radio source

Repo ↗ Electronics 2026

Circuit Builder

A desktop circuit editor and simulator where users can sketch a schematic, wire it up, and watch it actually work in DC, transient, and frequency response.

Constructed a nodal analysis solver for DC, transient, and AC
Live Simulate mode shows the voltage at every terminal, updating as you edit the circuit
Conduct Frequency response and make Bode plots, for each circuit
Saves all files in a plain-JSON save format

Repo ↗ Software 2026

EEE Lunar Rover

A WiFi-controlled rover that drives across a fake lunar surface, tasked to hunt down artificial rocks, and reads their signals and classify rocks.

Awarded Best First Year Project 2026 at Imperial College London
Designed, tested, and debugged the infrared and magnetic circuits, and soldered three of the four sensor boards
Built a separate analogue circuits for each of the four sensors, then combined them onto one PCB
3D printed chassis with ackermann steering and attached the flags of the nationalities in the team
Controlled and monitored live from a browser over WiFi

Electronics 2026

Operational Amplifier in LTSpice

Spent a few months teaching myself the internal layout of an OpAmp, then built one from scratch out of individual transistors in LTSpice.

Learned and built every stage myself: differential pair, current mirrors, and a push-pull power stage
Tested it by stepping the feedback resistor through four values and checking the gain against theory
Measured gain matched the predicted Rf/Rin ratio almost exactly, even at ×1000

Electronics 2026

websiteproject

A personal Django site with a few small apps (accounts, file storage, a to-do list with email reminders, and more), which was self-hosted on a Raspberry Pi at home.

Five small apps: accounts, file storage, to-do, random tools, server diagnostics
File uploads can be edited and deleted, with validation on what's accepted
To-do list emails you reminders on a schedule, via a custom management command
Hosted it myself on a Raspberry Pi at home

Repo ↗ Web App 2025

Billiard Club

A full 2D pool game built from scratch in Python, complete with its own physics engine, an AI opponent, and a full menu system.

Full 8-ball rules: turn tracking, fouls, potting, win detection
Wrote my own physics engine for ball-to-ball and ball-to-wall collisions
Bank-shot aim assist that projects the cue ball's path off the rails
A basic AI opponent, plus Player vs Player and Sandbox modes

Repo ↗ Game 2024

Pygame Games

A small collection of games built in Pygame while I was learning Python and game dev: a brick-breaker and a from-scratch Tetris.

Ballz: an aim-and-fire brick-breaker with combo scoring and coin pickups
Tetris: full piece rotation and row-clearing, built entirely from scratch

Repo ↗ Game 2023

Digital Alarm Clock

A 24hr digital alarm clock I designed and built from scratch for a real client brief: a custom-etched PCB, crystal-accurate timekeeping, and a 3D-printed case.

Crystal-accurate 24hr timekeeping, using a 32kHz oscillator and EEPROM storage
Etched and soldered the PCB by hand, with its own dedicated voltage regulator
3D-printed PLA case with laser-cut acrylic faces (190×90×90mm, 500g)
Designed end-to-end for a real client brief and tested against every spec point

Electronics 2023

Electronic Reaction Time Game

A reaction-time game built around LED chasers, with a custom PCB and a 3D-printed triangular enclosure I designed myself.

LED chaser sequence: light travels along the strip and you react to stop it on target
Custom PCB built around the CD4514BE demultiplexer
Housed in a 3D-printed triangular enclosure I designed in CAD

Electronics 2022