NFC-Triggered Audio Device Prototype
Budget: ₹12,500 – ₹37,500 INR
I need a working prototype of a small, self-contained audio player that recognises NTAG NFC cards, then—only after I press a designated button—plays the MP3 file linked to that card. The flow I’m after is simple: tap an NTAG card, an LED confirms it’s recognised, I press the button, and the selected MP3 starts through an onboard speaker or 3.5 mm jack.
Prefer it to be someone from Bangalore, India that I can collaborate physically offline.
You’ll be responsible for the full hardware–firmware loop: choosing a suitable NFC reader module, integrating an MP3-capable codec/decoder, handling local storage (SD or equivalent), driving basic UI elements using an e-ink screen and powering everything from USB or battery. Clean, well-commented firmware is essential so I can iterate on card–file associations later.
Deliverables
• Functional breadboard or PCB prototype ready for demo
• Firmware source (preferably C/C++ or Arduino-compatible) with build instructions
• Schematic, BOM, and brief design notes highlighting key components and NFC antenna tuning
• Short video or live call showing the prototype reading an NTAG, waiting for the button press, then playing the mapped MP3
If you already have experience with NTAG integration, low-power audio playback, or similar cue-based devices, that will help us move quickly.
Job Title: PCB Design for ESP32 Audio Player (KiCad/EasyEDA)
Description:
I am looking for an electronics engineer to design a custom PCB for a consumer audio device.
MCU: ESP32-S3-WROOM-1 (Surface mount module).
Peripherals: MAX98357A (Audio), SD Card Slot, PN532 (NFC), 5 Tactile Buttons, USB-C for charging/data.
Power: TP4056 or similar LiPo charging circuit.
Constraints:
Max Dimensions: 36mm x 56mm (Must fit inside enclosed STEP file).
Shape: Rectangular with mounting holes at specific coordinates (I will provide DXF).
Components: Must be Single-Sided layout (all chips on top) if possible to save thickness.
Deliverables: Gerber Files, BOM (LCSC preferred), Pick & Place file.
Prefer it to be someone from Bangalore, India that I can collaborate physically offline.
You’ll be responsible for the full hardware–firmware loop: choosing a suitable NFC reader module, integrating an MP3-capable codec/decoder, handling local storage (SD or equivalent), driving basic UI elements using an e-ink screen and powering everything from USB or battery. Clean, well-commented firmware is essential so I can iterate on card–file associations later.
Deliverables
• Functional breadboard or PCB prototype ready for demo
• Firmware source (preferably C/C++ or Arduino-compatible) with build instructions
• Schematic, BOM, and brief design notes highlighting key components and NFC antenna tuning
• Short video or live call showing the prototype reading an NTAG, waiting for the button press, then playing the mapped MP3
If you already have experience with NTAG integration, low-power audio playback, or similar cue-based devices, that will help us move quickly.
Job Title: PCB Design for ESP32 Audio Player (KiCad/EasyEDA)
Description:
I am looking for an electronics engineer to design a custom PCB for a consumer audio device.
MCU: ESP32-S3-WROOM-1 (Surface mount module).
Peripherals: MAX98357A (Audio), SD Card Slot, PN532 (NFC), 5 Tactile Buttons, USB-C for charging/data.
Power: TP4056 or similar LiPo charging circuit.
Constraints:
Max Dimensions: 36mm x 56mm (Must fit inside enclosed STEP file).
Shape: Rectangular with mounting holes at specific coordinates (I will provide DXF).
Components: Must be Single-Sided layout (all chips on top) if possible to save thickness.
Deliverables: Gerber Files, BOM (LCSC preferred), Pick & Place file.
Related categories:
Electronics
Microcontroller
PCB Layout
C++ Programming
Arduino
Embedded Systems
Signal Processing
Audio Engineering