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
Interactive Real Estate Listing Platform Category: API Development, HTML, JavaScript, Laravel, MySQL, Node.js, PHP, PostgreSQL, Web Development Budget: $3000 - $5000 USD
23-Dec-2025 22:50 GMT
Blog Article to Spanish Translation Category: Article Writing, Blog Writing, Castilian Spanish Translator, Content Writing, Copywriting, Editing, Spanish Translator, Translation Budget: $250 - $750 USD
23-Dec-2025 22:48 GMT
LinkedIn & Instagram Traffic Strategy Category: B2B Marketing, Content Marketing, Graphic Design, Internet Marketing, Link Building, SEO, Social Media Management, Social Media Marketing Budget: ₹1500 - ₹12500 INR
23-Dec-2025 22:48 GMT
Simple 3-4 Page Business Website Category: Content Management System (CMS), CSS, Graphic Design, HTML, PHP, Web Design, Web Development Budget: £250 - £750 GBP
23-Dec-2025 22:46 GMT
Shopify DTG Embroidery Store Build Category: ECommerce, HTML, SEO, Shopify, Shopify Development, Web Design, Web Development Budget: $250 - $750 USD
23-Dec-2025 22:46 GMT
AI-Powered Educational Video Production Category: After Effects, AI Animation, AI Content Creation, AI Design, AI Development, Video Editing, Video Production, Video Services Budget: $30 - $250 USD