**Complete Design of 33×33 mm RS485 Smart Fan Regulator Daughter Board for ESPHome – ATtiny1614 \+ 24V Relays**

@abdurRafiqM

HI, I am an experienced electronics and PCB Design engineer, specialised in use of ECAD software such as Altium Designer, KICAD, EasyEDA, etc. for the the design of electronics and PCB. I will design your projects to meet your Requirements and the industry standard. I do all kinds of circuits such as Power delivery circuit, Sensor Integrated Circuits, wireless control, MCUs etc. I will deliver the following. The Schematics for your Design The PCB for the design Bill of materials(If needed) Gerber, Pick and Place and other manufacturing and assembly drawings needed. Full Support and consultancy till the project is done. Kindly send me message for my previous designs and also so we can discuss further on your project I look Forward to working with you. Best Regards, Abdur-Rafiq

@alluankit01

Hi, I can help with the ATtiny1614 RS485 smart fan regulator daughter board, but for safety and quality I would treat ₹1,500 as the initial architecture/feasibility milestone, not the complete 230 VAC PCB + firmware project. In this first milestone, I can review the full requirement, validate the relay/capacitor speed logic, 24V to 3.3V supply approach, RS485 interface, Norisys knob decoding, mains/SELV separation, and whether 33 × 33 mm is safely achievable. I’m comfortable with KiCad, ATtiny/AVR firmware, RS485, relay control, buck regulators, ESPHome integration concepts, JLCPCB outputs, and mixed low-voltage/mains PCB safety review. Initial deliverables: * Circuit architecture review * Relay/capacitor control logic * ATtiny1614 pin mapping * RS485 protocol outline * Norisys knob input logic * Power/protection review * 33 × 33 mm PCB feasibility check * Safety/creepage concerns * Final scope and cost estimate If the size and safety constraints are acceptable, I can continue with complete schematic, PCB layout, firmware, Gerbers, BOM/CPL, and ESPHome example as a separate full design milestone. Best regards Ankit

@Santoshchaulaga

Hello, I am Santosh Chaulagain, a professional Electrical Engineer and PCB Designer with over 7 years of experience in schematic design, PCB layout, and embedded systems, including ESP32, IoT devices, analog and digital circuits. I have successfully completed multiple projects for clients worldwide, delivering reliable and manufacturable designs. I have carefully reviewed your project requirements and I am confident that I can provide a high-quality solution tailored to your needs. My expertise includes PCB design using industry standards, component selection, BOM preparation, Gerber generation, and design optimization for cost and performance. I always ensure that my designs are fabrication-ready and tested for reliability. I focus on clear communication, timely delivery, and customer satisfaction. I am happy to discuss your project in detail and provide revisions until the final result meets your expectations. Looking forward to working with you. Best regards, Santosh C. Electrical Engineer | PCB Designer | ESP32 & IoT Specialist Premier Calling

@nehasingh17

We at HardFault can design this daughter board end-to-end, including the KiCad schematic, 33 × 33 mm 2-layer PCB, ATtiny1614 firmware, RS485 protocol and ESPHome integration. We understand the critical part of this project is not just fitting everything into the small board, but maintaining proper 230 VAC/SELV segregation, creepage/clearance and safe relay switching. We’ll handle the relay capacitor network, Norisys low-voltage knob interface, 24 V to 3.3 V supply, RS485 protection, relay drivers, break-before-make sequencing and safe-state behavior. The PCB will be optimized for JLCPCB assembly where practical, with UPDI access and complete manufacturing outputs. You’ll receive the complete KiCad project, verified BOM, ERC/DRC reports, Gerbers, drill/CPL files, firmware, documented RS485 protocol, ESPHome example and bring-up procedure. We’ll also make sure the local knob continues controlling the fan when ESPHome or RS485 is unavailable. We have practical experience with embedded controllers, mixed-voltage hardware, relay control and compact PCB development, and we’ll treat any existing design only as a functional reference rather than blindly reusing it. Would you like us to first review the 230 VAC capacitor/relay switching architecture and confirm whether the 33 × 33 mm target can be achieved safely before committing to the final layout?

@rfandelectronics

With a core focus on circuit design and electronics, I am uniquely positioned to provide you with a complete schematic and PCB design for your smart ceiling-fan regulator daughter board. Equipped with comprehensive proficiency in KiCad, I can ensure high-quality work with precise component verification and skilled PCB layout. I have extensive experience working with ESPHome-based home automation systems making me aptly familiar with their requirements. Moreover, having worked on similar projects in my career as an electronics engineer, I have developed a deep understanding of the intricacies involved in designing systems that require reliable communication protocols like RS485. From the 3.3 V RS485 transceiver to the UPDI programming interface, I am confident in my ability to integrate these successfully into the overall architecture. Lastly, my commitment to delivering optimized and reliable solutions will ensure that your circuit operates smoothly even during unforeseen circumstances such as loss of connection with the ESPHome controller. I can appropriately configure the daughter board to maintain functionality through physically operated knobs ensuring seamless user experience. Trust me for a fully documented and well-integrated RS485 protocol that aligns effortlessly with your ESPHome system and serves its intended purpose reliably. Let's bring your vision for this compact smart ceiling-fan regulator to life!

@thanhphuong14

I have good experience in hardware and PCB design, and this fan speed controller project is well suited to my expertise. I can handle the complete schematic, component selection, relay and capacitor control circuit, RS485 hardware, power supply design, and PCB layout while carefully considering the safety requirements for 230 VAC.

@sunnykushwaha89

Hello, I have reviewed the engineering scope for your 230 VAC smart ceiling-fan daughter board. While the posted budget is below typical market rates for mixed-voltage hardware and firmware (usually ₹7,000+), **I can deliver the complete turnkey project for ₹3,500 INR** as an introductory rate to establish my profile. **Technical Execution:** * **Mains Safety & PCB (33×33 mm, 2-Layer):** Strict SELV/230 VAC segregation, isolation routing slots under Panasonic relays for creepage, optimized LMR51610 buck switching loop, and protected RS485 with TVS and selectable 120 Ω termination. * **Capacitors & Input Network:** Continuous-run AC capacitor footprints, 10 Ω / 1 W fusible inrush resistors, 330 kΩ bleeders, and RC debounce for the Norisys dry contacts. * **ATtiny1614 Firmware:** 200 ms break-before-make dead time, hard mutual exclusion (K4 never overlaps K1–K3), Speed 8 (`P1+D`) decoding, fail-safe boot states, and physical knob fallback if RS485 goes offline. * **ESPHome Integration:** Checksum-verified Modbus/serial register map with a ready-to-flash ESPHome YAML configuration. **Deliverables:** 1. Self-contained KiCad project (`.kicad_pro`, `.kicad_sch`, `.kicad_pcb` with embedded libraries). 2. JLCPCB manufacturing pack (Gerbers, Drill, BOM with verified MPNs, CPL). 3. ATtiny1614 C/C++ firmware source code + ESPHome YAML example. 4. Schematic PDF, 0-error DRC/ERC logs, and Bring-Up Guide. **Bid:** ₹3,500 INR | **Timeline:** 10–12 Days

@Vimtex

I'm Vimarsh and I believe my skills and experience are a perfect match for your smart fan regulator project. With an extensive background in electronics engineering and over two years of successfully delivering end-to-end hardware and software solutions, I have gained valuable knowledge in the design techniques and integration you require. My team is adept at handling intricate circuit designs and has previous experience with PCB layouts of similar sizes, meeting tight power segregation requirements, and making provisions for optimal thermal conductivity. Our proficiency with KiCad will ensure meticulous design through schematic creation, component verification, PCB routing, firmware development, and DRC/ERC checks. Moreover, we have First-Hand experience in working with devices like ATtiny1614 locally connected to RS485 transceivers for effective communication with the ESPHome controllers as you require.I assure you our complete dedication to create a safe and reliable fan regulator that will perfectly meet your needs. With your project requirements favoring reliability, long-term applicability, I guarantee supply-chain conscious component selection that performs optimally even under fluctuating loads- ensuring your Regulator offers unparalleled performance now and in future enhancements. Let's get started on building this trailblazing automation solution for you!

@paulpham93

I'll deliver the complete schematic and PCB layout for your 33×33 mm RS485 fan regulator daughter board with ATtiny1614 and 24V relays, optimized for ESPHome integration. I provide production-ready Gerbers, BOM, and design validation. My Upwork profile has earned over $300,000 with account Paul.P, built on precise, manufacturable PCB designs and embedded microcontroller programming. Best regards, Paul.