EEE3088F MM Power Project

Micromouse Power Subsystem – EEE3088F 2025

This repository contains the design files, documentation, and supporting material for the Micromouse Power Subsystem designed as part of the EEE3088F course at the University of Cape Town. The subsystem was built to meet a strict set of functional and mechanical requirements under tight budget constraints.

🧭 Project Overview

Micromouse is a global robotics competition in which small autonomous robots solve mazes. The UCT EEE3088F course replicates this challenge by requiring students to develop individual subsystems that together build a complete micromouse. This repository documents the design and implementation of the Power Subsystem, which is responsible for:

• Bidirectional control of 4 motors (2x 200mA, 2x 500mA)
• Battery charging (with selectable fast and slow charging modes)
• USB-C PD negotiation (9V)
• 5V and 3.3V regulation
• External load switching (2x 1A high-side loads)
• Ultra-low power OFF mode (<30µA)
• INA219 current and voltage monitoring

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🗂 Repository Structure

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🛠 Hardware Requirements

• Battery: 3.7V 800mAh LiPo (Micro Robotics)
• USB PD IC: HUSB237 for 9V negotiation
• Motor Driver: DRV8833 for up to 2A peak per motor
• Load Switch: AP22814 (3A capable, overcurrent protected)
• Battery Monitor: INA219 over I2C
• Charging IC: TP4056-42-ESOP8
• Voltage Regulators:
  • 5V: MT3608 Boost Converter
  • 3.3V: AMS1117-3.3 Linear Regulator

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✅ Final Design Summary

• Footprint: 82mm × 60mm, mounted via motherboard drill holes
• Connector: 2×16 2.54mm header, JST-PH battery connector
• 5V and 3.3V Outputs:
  • 5V output: up to 1.5A (±5%)
  • 3.3V output: up to 300mA (±5%)
• Charging Modes:
  • Slow: ~200mA (logic low on control pin)
  • Fast: ~600mA (logic high on control pin)
• Sleep Mode: OFF current draw <30µA, confirmed via test pads
• INA219: Allows shunt-based battery current measurement

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🔧 How to Use

1. Open the KiCad project in /KiCad_Files.
2. Review schematic, footprints, and PCB constraints.
3. Upload files from /Gerbers, /PnP, and /BOM to JLCPCB.
4. Use /Screenshots for evidence of successful upload and configuration.

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📦 JLCPCB Submission

All files have been validated and successfully uploaded to JLCPCB. Screenshots showing the:

• Correct BOM upload
• Matching cart configuration are provided in /Screenshots.

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👨‍💻 Authors

• Alex Hillman HLLALE010

• Joab Kloppers KLPJOA002 Both team members contributed distinct sections of the PCB design and documentation, as per the individual assessment requirements of the course.

• GitHub: EEE3088F_PCP_Power_Project

Contributions are limited to the Power Subsystem. Design files and reports are subject to UCT's academic integrity policies.

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📜 License

This project is licensed for academic purposes only.