High-Speed MCU Transceiver RF Design
Budget: $750 – $1,500 CAD
Project Title:
> High-Speed Dual-Node RF Relay (125kHz / 2.4GHz / 315MHz) - Teensy 4.1
>
Project Description:
> I am looking for an experienced RF/Embedded Systems Engineer to design a 100% workable dual-node relay system for a keyless entry project.
> The System Architecture:
> * Node A (Car-Side): Must sense a 125kHz LF wake-up signal (AS3933 + ANT-125K) and relay data via 2.4GHz (NRF24L01+ PA/LNA).
> * Node B (Key-Side): Receives 2.4GHz, re-transmits 125kHz (TC4420 driver + LC tank), and listens for 312/314/315MHz UHF response (CC1101) to relay back to Node A.
> * Hardware: Both nodes are based on the Teensy 4.1.
> Key Technical Requirements:
> * PCB Design: 4-layer board preferred for EMI shielding. Must include proper ground planes and keep-out zones for antennas.
> * Power Management: High-current decoupling for the LC driver to prevent MCU brownouts.
> * Firmware: Low-latency C++ code (sub-5ms) for transparent signal relay.
> * Deliverables: Gerber files, BOM (with LCSC/DigiKey parts), and documented source code.
> High-Speed Dual-Node RF Relay (125kHz / 2.4GHz / 315MHz) - Teensy 4.1
>
Project Description:
> I am looking for an experienced RF/Embedded Systems Engineer to design a 100% workable dual-node relay system for a keyless entry project.
> The System Architecture:
> * Node A (Car-Side): Must sense a 125kHz LF wake-up signal (AS3933 + ANT-125K) and relay data via 2.4GHz (NRF24L01+ PA/LNA).
> * Node B (Key-Side): Receives 2.4GHz, re-transmits 125kHz (TC4420 driver + LC tank), and listens for 312/314/315MHz UHF response (CC1101) to relay back to Node A.
> * Hardware: Both nodes are based on the Teensy 4.1.
> Key Technical Requirements:
> * PCB Design: 4-layer board preferred for EMI shielding. Must include proper ground planes and keep-out zones for antennas.
> * Power Management: High-current decoupling for the LC driver to prevent MCU brownouts.
> * Firmware: Low-latency C++ code (sub-5ms) for transparent signal relay.
> * Deliverables: Gerber files, BOM (with LCSC/DigiKey parts), and documented source code.