ESP32 Smart-Pen Firmware & CAD

@MuhammadUzair16

Hi I am an embedded systems engineer with over 16 years of experience. I have worked on ESP32 based consumer prototypes where firmware, enclosure constraints, power behavior, and manufacturability all had to come together reliably. For your smart pen, I can clean up the Arduino-compatible firmware, make the IMU/LCD path stable and responsive, add OTA and low-power handling, and trace the reset issue around the backlight spike from both firmware and hardware angles. I am also comfortable keeping the project Arduino IDE compatible while using PlatformIO or ESP-IDF practices where they help with structure and debugging. On the mechanical side I can refine the Fusion 360 enclosure and prepare practical GRBL-ready 3-axis toolpaths for acrylic and aluminium using your 1/4 inch and 1 mm end mills, with attention to fit, serviceability, and repeatable milling rather than just a visually finished model. A few things I would like to confirm are the exact IMU/LCD part numbers, current power source/regulator, and whether you already have scope captures or reset logs from the backlight event. I can also suggest small hardware changes if needed to make the pen behave more like a product-ready device. Please contact me to discuss details.

@amelectronics

Hello, I can help you complete and refine your connected-pen prototype from both the firmware and mechanical sides. My experience includes ESP32 development, IMU integration, LCD interfaces, OTA updates, power optimization, debugging hardware/firmware issues, Fusion 360 design, and GRBL CNC machining workflows. I can: • Develop clean, well-documented Arduino-compatible ESP32 firmware. • Integrate and optimize IMU communication via I²C or SPI. • Process orientation data and update the LCD smoothly without flicker. • Add OTA updates and power-saving features. • Diagnose and fix the intermittent reset issue caused by backlight power spikes. • Review and improve the Fusion 360 enclosure design. • Generate reliable GRBL-compatible toolpaths and G-code for acrylic and aluminum machining. • Provide documentation and recommendations for any hardware improvements. Before I provide an exact timeline and estimate, could you share: • ESP32 model • IMU model • LCD model/driver • Current firmware files • Schematic/wiring diagram • Fusion 360 files Once I review the existing design, I can propose the best architecture and help deliver a stable, production-ready solution. Looking forward to discussing the project.

@macroenergy

With an extensive background in electrical engineering, electronics, and embedded systems, I am well-equipped to tackle the challenges your ESP32-powered smart pen project presents. My knowledge in Arduino, specifically my experience in writing and optimizing firmware codes for different applications, will greatly contribute to enhancing the functionality of your prototype through clean and documented code, resolving I2C communication glitches, building power-saving routines, and troubleshooting the persistent reset bug. Moreover, my proficiency in using CAD software including Fusion 360 makes me comfortable with modifying and refining the existing design of your pen's housing to ensure better functionality and compatibility with your GRBL-based router. What’s more, I can provide you with high-quality output files such as Step/FCStd/F3D to ease the manufacturing process while also producing reliable G-code for your ¼-inch and 1 mm end mills. Lastly, my skills extend beyond code development- as an electrical engineer, I'm skilled at identifying hardware areas that could be adjusted or optimized for improved performance. I am excited to combine this expertise with my other listed skills in this project. Given my proven track record in solving complex hardware and software problems, I promise to deliver well-commented Arduino-IDE project files leveraging ESP-IDF / PlatformIO sensibly to make your connected-pen ready for market.

@SPARKtechBD

I have lots of experience on ESP32... bellow my expertise ... Since 2003 I am working in Digital Electronic. So more than 18 years of experience in Electronics. Arduino NANO/UNO/MEGA, ESP32 and Raspberry PI to build a digital device to read sensor data and send it to the web server, motor control, control relay switches and LEDs. More than 5(five) years of experience in Arduino design and build. If you want an excellent and error-free project delivery, then send a message to me, please. Have more than 10(years) years of experience in C/C++ to build Windows/Linux applications and micro-controller firmware building. If you want a good job delivery, then send a message to me, please. Since 1995 I have been working on Analog and Digital Electronics to build any kind of device. I have build lots of devices. So more than 20 years of experience on Electronics. Including power supply design. Any kinds of schematic and PCB design. Expert PCB design in EasyEDA Pro IDE.

@hayteekeys

KINDLY READ THROUGH MY PROPOSAL THIS IS WHAT I WILL DO - Take your existing Arduino sketch and rewrite it into clean, well-commented, stable firmware for the ESP32. - Optimize IMU (9-axis) reading over I²C/SPI, smooth orientation processing, and flicker-free real-time LCD updates. - Add deep-sleep / power-saving modes and reliable OTA update support. - Debug and fix the intermittent reset issue during backlight spikes (likely power or EMI related). - Refine the Fusion 360 enclosure design for better fit and manufacturability, then generate clean G-code toolpaths for your GRBL router (acrylic + aluminium shells). - Deliver: full commented Arduino project, final 3D files (STEP + F3D), G-code, and hardware recommendations. RELEVANT PROJECTS - 2025: ESP32-based smart stylus with 9-axis IMU + OLED – stable real-time display, power optimization, OTA. - 2024: IMU + LCD pen prototype for digital sketching – fixed reset bugs, GRBL-milled enclosure. QUESTIONS - Can you share the current Arduino sketch and Fusion 360 file? - Exact IMU and LCD models? - Any size or mechanical constraints for the pen? - Preferred development environment (Arduino IDE, PlatformIO, or ESP-IDF with Arduino core)? ESP32 + IMU + mechanical design specialist. Can deliver stable firmware and ready-to-mill files in 7–10 days. Ready to start now, please send the current code and 3D model and i’ll turn this into a polished prototype.

@JhonZumaeta

Hello, This project fits very well with my experience. I’m an Electronics Engineer with over 12 years of experience in embedded systems, firmware development, and hardware design. I have worked extensively with ESP32, IMUs, I²C/SPI communications, LCD displays, OTA updates, low-power optimization, and debugging hardware/software integration issues. I also have experience diagnosing intermittent resets caused by power integrity problems, current spikes, and brownout conditions. In addition to firmware, I regularly work with Fusion 360, PCB design, and manufacturing processes. I can help refine the enclosure design, generate STEP/F3D deliverables, and prepare reliable GRBL-compatible G-code for CNC machining. I can deliver: • Clean, documented Arduino-compatible ESP32 firmware. • IMU data acquisition, orientation processing, and smooth LCD updates. • OTA and power-saving features. • Root-cause analysis and resolution of the reset issue. • Refined enclosure design with manufacturing-ready files. • CNC toolpaths and post-processed G-code. • Hardware recommendations where beneficial. My focus is not only making the prototype work, but helping turn it into a stable, product-ready device. Best regards, Jhon Zumaeta

@yaroslavmark

Hi, I’m a Senior Embedded Systems Engineer with 10+ years of experience in ESP32/STM32 firmware, sensor integration, and product-oriented hardware development. I have delivered 25+ custom embedded PCB projects and developed multiple ESP32-based IoT devices with IMU, LCD, BLE/Wi-Fi, OTA updates, and low-power operation, including systems that achieved continuous 72+ hour stability testing and reduced power consumption by over 30%. Approach ✅ I will review the existing ESP32 firmware, profile I²C/SPI communication, optimize IMU acquisition and orientation processing, and implement flicker-free LCD updates using efficient buffering and task scheduling. ✅ I will isolate the reset issue by analyzing power integrity, backlight current transients, brownout conditions, and firmware logs, then validate the fix through extended runtime testing. ✅ I will add OTA update capability, sleep-mode strategies, watchdog protection, and code documentation while maintaining full Arduino IDE compatibility. ✅ I will refine the Fusion 360 enclosure, verify manufacturability for acrylic and aluminum machining, and generate validated GRBL-compatible toolpaths and post-processed G-code for both cutter sizes. Questions ✅ Which IMU and LCD modules are currently being used? ✅ Do you already have the Fusion 360 files and existing firmware source code available? ✅ Have you identified whether the reset issue is caused by hardware or firmware? Best, Yaroslav

@tetianam8

⭐⭐⭐⭐⭐ Your project sits right at the intersection of embedded systems, product development, and prototype engineering—exactly the type of work I enjoy. From your description, the most important task is not simply cleaning up the Arduino sketch, but turning the prototype into a stable, product-ready platform. I would begin by investigating the intermittent reset issue, as LCD backlight current spikes often point to brownout, power distribution, grounding, or regulator stability problems that can impact everything else. I can help with: • ESP32 firmware optimization and code refactoring • IMU integration and orientation processing (I²C or SPI) • Flicker-free LCD updates and graphics optimization • OTA firmware update support • Power-saving implementation and battery-life improvements • Root-cause analysis of reset events • 24-hour runtime stability testing • Fusion 360 enclosure refinement • CNC-ready toolpaths and post-processed G-code for GRBL routers • Documentation and hardware improvement recommendations A few questions: • Which ESP32 variant, LCD controller, and IMU are being used? • Is the backlight driven directly or through a transistor/MOSFET? • Will the device be battery-powered in production? I can deliver clean, well-documented Arduino-compatible firmware, manufacturable enclosure files, and a stable prototype capable of passing the 24-hour runtime requirement.

@AlexandrGergel

Greetings, I worked on a small handheld ESP32 device before that used an IMU, a tiny display, and battery power, so I know the kind of timing and power issues that can show up in this size of product. The main work was keeping the sensor reading stable, updating the screen smoothly, and cleaning rough Arduino code so it was easier to test and maintain. For your pen, I think the reset during the backlight spike is the first thing to solve, because firmware changes will not matter much if the power rail is dipping. I would start by checking the power path, backlight drive, decoupling, and reset logs, then clean the firmware structure for IMU reading, orientation processing, LCD refresh, power saving, and OTA. If the boards are ready, I can usually prepare a first firmware demo in about 5-7 days, with the enclosure/CAM work following after the Fusion files and router limits are reviewed. A few details would help before starting: exact ESP32 board, LCD driver, IMU part number, current power schematic, and your router work area/stock thickness. Sincerely,

@electronicsdone

Dear Client, The biggest challenge in this project is not getting the ESP32 to read IMU data—it is achieving stable, real-time sensor fusion and display updates while eliminating power-related instability, interrupt conflicts, and timing jitter that can cause flicker, resets, or inconsistent orientation tracking in a compact battery-powered device. With over 30 years of experience in ESP32 development, I²C/SPI sensor integration, IMU data processing and low-power embedded system design including Fusion 360 modeling and CNC toolpath generation for compact enclosures. ✅ For this project, I would focus on: 1. Building a clean, non-blocking software architecture for ESP32 using FreeRTOS tasks to handle IMU sampling, sensor fusion, and LCD updates independently. 2. Implementing stable IMU processing to ensure smooth, low-latency orientation output without jitter. 3. Resolving reset issues by analyzing power rail stability, backlight current spikes, and improving decoupling and power sequencing. Two quick questions: 1. Which 9-axis IMU and LCD modules are currently being used? 2. Have you identified whether the reset issue is caused by power supply instability or software? If you message me, I can outline a full system architecture, power stability fixes, and a manufacturable CAD revision plan. Best regards, Prat PCB Must Innovations

@shadabkhan92

As an experienced firm, we specialize in converting prototypes into quality production-grade infrastructure - just the kind of competence you need to make your connected-pen dream come true. Our wealth of experience includes building AI systems, integrating them with robust ERP platforms like Odoo, designing and constructing custom IoT hardware, and developing efficient firmware for microcontrollers like Esp32. This multi-layered skill set ensures that we can handle all aspects of your project seamlessly and professionally. Not only is your project precise and technical, but it also requires a keen eye for detail and optimization. With our hand in device construction, data processing from live sensors, and making split-second decisions, we've developed an integrated approach to hardware-software projects that synergizes perfectly with yours. Particularly, our proficiency in working across Arduino, ESP IDFs or Platform IO aligns perfectly with the preferences you've presented. Lastly, our track record proves our commitment to quality delivery. We design embedded solutions that survive rigorous stress tests - be it 24-hour runtime examinations or surviving intermittent reset bugs. Our philosophy is to make technology work for businesses and not the other way around; this means your final product will be a fully fluent device ready to grace market demands. Choose us for a smart pen that surpasses prototype stage!

@FranciscoSilvi

Hi There! As you can see in my portfolio on my profile, I have extensive experience designing PCBs and mass production equipment, just like you need. I can handle your project. I apologize for the simple proposal; I know you're probably tired of reading AI-generated proposals, and I'd rather not waste time on that. If you're interested in working with me, send me a message and we can work out the details! Best Regards

@edi45

HI, I develop many esp32 product throughout 11 years in embedded system engineering. I can help you design it with IMU and simple enclosure. I have 3D printer to test it, may be IMU module that we are going to use. So lets discuss the detail may be we can get started soon

@mahmoudralizadeh

I will take your existing Arduino sketch and rebuild it into clean, well-structured, and highly optimized firmware for the ESP32. This includes reliable I²C (or SPI) communication with the 9-axis IMU, real-time orientation processing, smooth flicker-free LCD updates, power-saving modes, and stable OTA update support. I will also diagnose and fix the reset issue caused by backlight spikes. On the mechanical side, I will refine your Fusion 360 enclosure design for better fit and manufacturability, then generate optimized 3-axis G-code for your GRBL router (using ¼-inch and 1mm end mills) for both acrylic and aluminium shells. Two quick questions: 1. Which LCD model are you using (size, driver, resolution)? 2. Do you prefer to stay purely in Arduino IDE or can we use PlatformIO (while keeping full Arduino compatibility)? I’m a senior embedded developer with over 8 years of experience in ESP32 projects, IMU-based motion systems, real-time displays, and low-power IoT devices. I also have strong skills in Fusion 360 and CNC machining workflows for prototype enclosures. I will deliver a clean, well-commented Arduino-compatible firmware that passes 24-hour stability testing, fully updated enclosure design files with ready G-code, and clear documentation of any recommended changes. Additionally, I commit to **1 full month** of free support after delivery to ensure everything works perfectly. Ready to turn your prototype into a polished, product-ready device. Let’s get started!

@intelliresponse

With over a decade of experience excelling in custom projects within the Python and C domains, I am confident that I possess the skills you need to take your connected pen prototype to the next level. Working with Arduino boards and 9-axis IMU is well within my purview. I can effortlessly optimize your existing ESP32 firmware by enhancing its data-handling capabilities through smoother I²C or SPI communication, further ensuring flawless inter-board connectivity. Additionally, intrinsic understanding of power-saving routines and OTA update support for the ESP32 will be instrumental in optimizing your pen's performance. My dedication as portrayed by having successfully delivered several high-stakes python web automation, web3 & blockchain, AI solutions projects adds an extra touch of reliability to my deliverables. Therefore, beyond providing a well-commented Arduino-IDE project that survives extensive runtime tests, I promise a clear write-up explaining any relevant hardware changes required to build a top-notch product-ready device. Let’s work together to make your ESP32 Smart-Pen an efficacious reality!

@nehasingh17

Hi, Why hire a single freelancer when you can hire a full engineering team ? We have already worked on a very similar ESP32-based smart pen project involving IMU sensor fusion, LCD display updates, OTA firmware, power optimization, and enclosure development. At HardFault, we already have tested and documented firmware modules for ESP32, including IMU data acquisition, real-time display handling, OTA updates, and long-duration stability testing. We can quickly adapt our existing codebase to your hardware, significantly reducing development and debugging time while ensuring Arduino IDE compatibility. On the mechanical side, we can refine the Fusion 360 enclosure, optimize it for acrylic and aluminum machining, and generate production-ready STEP files along with verified GRBL-compatible toolpaths and G-code for both 1 mm and ¼-inch end mills. We can also help identify the root cause of the backlight-induced reset issue and recommend any required hardware improvements for a product-ready design. Could you share which IMU and LCD modules are currently being used, and whether the existing PCB design is finalized or still open for modifications?

@Webslinger01

I’ve shipped over a dozen ESP32-based products from firmware through custom PCB and 3D enclosure design, so your smart pen project is right in my lane. I can write the firmware, lay out the board, and model the enclosure so everything fits together without guesswork. No handoffs, no coordination between separate vendors — I handle the whole stack. If you want to see a similar end-to-end build, I designed and shipped a custom ESP32-C3 air quality monitor with its own PCB and firmware in under three weeks. Let’s talk specifics and I’ll give you a clear timeline.

@miguelcen64

Hello, I can help you turn your ESP32 connected-pen prototype into a cleaner and more reliable product-ready device. I have experience with Arduino/ESP32 firmware, I²C/SPI sensor communication, IMU data processing, LCD updates, OTA support, debugging, and embedded power optimization. I can clean and document your current sketch, improve real-time IMU-to-LCD performance, reduce flicker, add power-saving routines, and investigate the intermittent reset issue caused by the backlight spike. I will also suggest any needed hardware fixes, such as power filtering or backlight current control. For the mechanical side, I can help refine the Fusion 360 enclosure and prepare reliable GRBL-compatible 3-axis toolpaths for acrylic and aluminium milling. I will deliver clean source code, design files, G-code, and clear documentation.

@shahzaib81829

Hi, I can help clean up your ESP32 firmware, fix the IMU/LCD communication, add OTA and power-saving features, and debug the reset issue caused by the backlight spike. I can also refine the Fusion 360 pen housing and prepare GRBL-ready toolpaths for acrylic and aluminium milling. I’ll keep the code Arduino-compatible, well-commented, and deliver the CAD, G-code, and hardware notes you need to move this closer to a product-ready prototype.