#3 - Carrot Pen Voice Recorder
By: Jerry Zhou, Varun Marrey, Eric Gu, Miles Kaiser
Embedded Files
Project Overview
Project Overview
Portable voice recorder with storage and playback functionality modeled after the "carrot pen" from Zootopia.
Features:
ESP32-S3-WROOM1 MCU
INMP441 microphone
1W 8ohm speaker with WM8524 DAC and LM386 amplifier
AP2112K 3V3 LDO and LTC3525 5V boost converter
1S 3000mAh battery and MCP73831 charge controller
ESP32, microSD card reader
Speaker DAC
LCD and mic connectors
Speaker amplifier
Clockwise from top: battery charger controller, LDO, boost converter, power path management circuit, USB
Project Implementation
Project Implementation
Full Bill of Materials: https://docs.google.com/spreadsheets/d/1VPOQ6GDWfS2BbbIeLe6p-e-rfNBuJgUUIbTYjbbw04E/
Firmware written using C++
Carrot-shaped PCB with mounting holes
3D printed carrot-shaped case
Functionality Achieved:
Audio recording and playback
Touchscreen interface
Battery power and USB-C charging
Complete working package
Ongoing Issues:
Playback audio quality
Playback volume
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