
Käynnissä
Julkaistu
Maksettu toimituksen yhteydessä
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.
Projektin tunnus (ID): 40291689
14 ehdotukset
Etäprojekti
Aktiivinen kuukausi sitten
Aseta budjettisi ja aikataulu
Saa maksu työstäsi
Kuvaile ehdotustasi
Rekisteröinti ja töihin tarjoaminen on ilmaista

Hello, Your dual-node RF relay system architecture is clear, and I have experience designing mixed-RF embedded hardware using Teensy-based platforms and multi-band radios. I can design the 4-layer PCB with proper RF isolation, antenna keep-out zones, and stable power delivery for the LF driver to prevent MCU brownouts. I have worked with NRF24L01, CC1101, and low-frequency drivers, and can develop low-latency firmware (<5 ms relay) using optimized SPI and interrupt handling. Deliverables will include schematics, Gerbers, BOM (LCSC/DigiKey), and documented firmware ready for testing. If helpful, I can also provide a signal timing diagram and RF layout strategy before starting to ensure the architecture meets the latency requirement.
$990 CAD 4 päivässä
6,6
6,6
14 freelancerit tarjoavat keskimäärin $1 248 CAD tätä projektia

As an experienced RF/Embedded Systems Engineer, I possess extensively honed skills in PCB design, electronics, and embedded systems— all of which are essential for executing your high-speed dual-node relay system. My previous projects have consistently required meticulous attention to detail and strict adherence to EMI shielding protocols— precisely like your monumentally significant 125kHz / 2.4GHz / 315MHz. My strength in firmware design comes from years of experience working on low-latency C++ code, rewriting signal travel codes and optimizing them for minimal latency. For the Teensy 4.1-based system you desire, the task will not only be met but exceeded. Moreover, a key aspect of my profile that particularly suits your project is my extensive knowledge of power management, as exhibited through my successful designs with high-current decoupling. This will allow me to effectively tackle the brownouts to prevent MCU shutdown you mentioned. I am highly proficient in creating PCB layouts with proper grounding techniques and are familiar with Gerber files' dimensions; thus, making me an ideal choice for providing you the Gerber files and BOM (with LCSC/DigiKey parts).
$1 000 CAD 15 päivässä
7,4
7,4

With over 5 years of experience in electrical engineering and embedded systems, I, Rashid, firmly believe I'm the best candidate to tackle your High-Speed Dual-Node RF Relay project. My proficiency in C++ programming and a deep understanding of hardware architecture make me adept at devising optimal, efficient solutions precisely like yours. My core capabilities encompass not just software or hardware in isolation but the highly coveted skill of harmoniously blending both. Hence, channeling this expertise into your project would ensure a seamless synchronization between your required software (firmware) and Teensy 4.1 (hardware). Additionally, my familiarity with advanced PCB Layout techniques such as a 4-layer board for EMI shielding and apt power management methods is articulated to deliver reliable, long-lasting products. Lastly, beyond mere 'handover', what sets me apart is my commitment to post-delivery support. Should any issues arise post-launch, be assured that I'll be around providing comprehensive assistance whenever needed – because for me, it's not just about delivering- it's about delivering the right way! It's about making sure a system remains stable and secure over time while maintaining its smooth functioning. So don't settle for less when you can partner with someone who embraces responsibility beyond launch – let's make your keyless entry masterpiece a reality together!
$1 350 CAD 15 päivässä
6,9
6,9

Hello, I’m excited about the opportunity to contribute to your project. With experience in embedded systems, RF design, and Teensy-based development, I can create a dual-node relay system that reliably senses 125kHz LF signals, transmits over 2.4GHz, and handles UHF response signals with low-latency firmware. I will design a robust PCB with proper EMI shielding, ground planes, and high-current power management to ensure stable operation, while delivering fully documented C++ code and a complete bill of materials. The result will be a production-ready, high-speed relay system meeting your keyless entry requirements with precise performance and reliability. Best regards, Juan
$1 125 CAD 7 päivässä
2,4
2,4

Hi, I’ve read your High-Speed Dual-Node RF Relay brief and I’m confident I can deliver a fully working Teensy 4.1-based system that meets your wake/sense and relay goals. I’ve designed mixed-signal RF/embedded systems with AS3933 LF sensing, nRF24L01+ links, CC1101 UHF receivers and LC-driven LF transmitters before, so I know how to balance RF layout, decoupling and low-latency firmware. My approach: produce a 4-layer PCB with solid ground planes and antenna keep-outs, place the ANT-125K and 2.4/315MHz antennas with matched feeds, add high-current local decoupling and an isolated supply for the TC4420-driven LC tank to prevent Teensy brownouts. Firmware will be optimized C++ on Teensy 4.1 using interrupt-driven reception and DMA/RTOS techniques to keep transparent relay latency under 5 ms. Deliverables: gerbers, LCSC/DigiKey BOM and documented source. I can start with a schematic and preliminary layout review, then iterate to a prototype. Which antenna types and form-factor constraints do you prefer for the car and key fob (wire, PCB, chip), and do you have any regulatory/region constraints for 315 MHz use? Sincerely, Daniel
$1 200 CAD 18 päivässä
0,0
0,0

Vaudreuil-Dorion, Canada
Maksutapa vahvistettu
Liittynyt maalisk. 11, 2026
$30-250 AUD
$1500-3000 USD
₹10000-30000 INR
₹600-1500 INR
$10-30 USD
£350-1500 GBP
$15-25 USD/ tunnissa
€30-250 EUR
£250-750 GBP
€8-30 EUR
₹1500-12500 INR
₹12500-37500 INR
$250-750 USD
$250-750 USD
₹1500-12500 INR
$25-50 USD/ tunnissa
min $100000 USD
$250-750 USD
$30-250 USD
$5000-10000 USD