Expected duration: 6-10 weeks Description: I am developing a small standalone audio-processing puck that attaches to the back of a mobile phone. An early breadboard version has already been built (with schematic, BOM, and partial firmware). I now need a skilled freelancer to refine this into a compact puck design with working firmware and deliver a testable prototype.
Your role will be to:
Review existing breadboard design files (schematic, BOM, early firmware)
Redesign into a puck-form PCB suitable for attaching to a phone
Write and implement firmware to process audio and trigger outputs based on provided phrase lists (details shared after NDA)
Integrate microphones, BLE, vibration motor, LED, and MCU/AI chip
Assemble the puck and test functionality
Provide a short video demonstration of it working
Ship the assembled prototype to me in the UK
Requirements:
Strong experience in embedded hardware + firmware development
Familiarity with audio devices, MEMS microphones, BLE, low-power design
PCB design skills (KiCad/Altium) with experience miniaturizing breadboard prototypes
Ability to write custom firmware for audio phrase/event detection
Clear communication and full documentation of work
Deliverables:
Refined schematic + PCB layout
Verified BOM with supplier links
Working firmware (.bin and/or source) implementing phrase/event detection logic
Assembled and tested puck prototype
Video demo of prototype working
Prototype shipped to UK
Documentation of design and firmware
Milestones:
Audit & Plan – Review existing design, provide updated schematic/BOM plan
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