
Closed
Posted
We are seeking an experienced hardware engineer to design and prototype a discreet, ultra‑compact wearable emergency device for woman. The device should function as a piece of jewelry while incorporating an accelerometer, capacitive touch sensor, microcontroller with Bluetooth Low Energy (nRF52832 or similar), and an optional GSM/NB‑IoT module (SIM800C or equivalent) for backup communication. It must be small (≤ 1.5 cm diameter, < 8 mm thick), lightweight (≤ 12 g), and designed for low‑power operation with a Li‑Po battery and wireless charging coil. The final product must connect via BLE to a mobile app and trigger alerts or emergency calls when activated. Deliverables include a complete bill of materials, schematic and PCB design, firmware, prototype assembly, and collaboration with a mobile developer to ensure seamless integration with the app. Required Skills: Strong background in electronic engineering and embedded systems, particularly in designing compact, low‑power devices. Expertise in PCB design, especially for flexible and miniaturized layouts. Experience with microcontrollers (nRF52832 or similar), Bluetooth Low Energy programming, and GSM/NB‑IoT modules (e.g., SIM800C) including AT commands and integration. Ability to integrate sensors such as accelerometers (e.g., LIS3DH) and capacitive touch sensors. Knowledge of power management, including Li‑Po batteries and wireless (Qi) charging circuits. Proficiency in firmware development (C/C++ or embedded RTOS) and optimization for power efficiency. Familiarity with product miniaturization techniques, IPX5–IPX7 waterproofing, and enclosure design suitable for wearable jewelry. Good communication skills to collaborate with a mobile app developer and provide clear documentation for manufacturing and testin
Project ID: 39690253
41 proposals
Remote project
Active 9 mos ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs
41 freelancers are bidding on average $35 USD/hour for this job

With a Master's in Embedded Systems and a passion for safety-driven engineering, I assure you an unwavering commitment to designing an ultra-compact safety wearable that checks all boxes of your project specifications. I bring along a sound background in Electronic Engineering and solid experience in designing compact, low-power devices - crucial requisites for this project. My expertise in PCB designing, especially for miniature and flexible layouts, combined with my profound familiarity with microcontrollers like the nRF52832 or similar will ensure efficient integration of sensors such as accelerometers and capacitive touch sensors into the device. Moreover, my knowledge of power management involving Li-Po batteries and wireless (Qi) charging circuits will enable me to create functioning hardware that adheres to your power efficiency standards. I appreciate so much about what sets this project apart from other wearable designs is the emphasis on IPX5–IPX7 waterproofing and it being designed suitable for wearable jewelry. Rest assured, I'm well-versed with these product miniaturization techniques and the demands of making something waterproof while maintaining the desired aesthetic look and would integrate it seamlessly.
$50 USD in 40 days
8.0
8.0

As an experienced hardware engineer with a passion for turning ideas into reality, I am an ideal fit for your Ultra-Compact Safety Wearable Design project. My expertise in electronic engineering, embedded systems, and PCB design align precisely with the needs of this project. Over my years of experience, I have become adept at not only designing compact, low-power devices but also integrating various sensors using C/C++ or embedded RTOS programming. Additionally, my skills in firmware development and power management are essential to ensure that the final product is optimized for power efficiency with Li-Po batteries and wireless charging coils. Having worked on similar devices before, I'm familiar with miniaturization techniques and the demands of IPX5–IPX7 waterproofing. Moreover, my proficiency in integrating GSM/NB-IoT modules would be pivotal in establishing seamless communication between the wearable device and mobile app as required. I believe in delivering meticulous work within deadlines without compromising on quality or performance. Given a chance to contribute to your project, I will bring my unwavering commitment and extensive skill set to create an ultra-compact wearable device that not only functions as a piece of jewelry but also prioritizes safety for women.
$38 USD in 40 days
6.6
6.6

With over a decade of experience in electronic engineering and embedded systems, I understand the importance of designing a discreet, ultra-compact wearable emergency device for women that combines both functionality and style. Your project requires a hardware engineer who can skillfully integrate an accelerometer, capacitive touch sensor, microcontroller, and optional communication module into a sleek piece of jewelry. I am confident in my abilities to meet your requirements for size, weight, power efficiency, and wireless connectivity, ensuring a seamless user experience when triggering alerts or emergency calls through the mobile app. In the realm of wearable technology, I have successfully delivered projects that merge advanced electronics with elegant design, particularly in the areas of miniaturization, power management, and sensor integration. My expertise in PCB design, firmware development, and collaboration with mobile developers will guarantee the successful realization of your vision for the ultra-compact safety wearable. I am eager to discuss your project further and provide you with a tailored solution that exceeds your expectations. Let's work together to bring this innovative wearable device to life.
$40 USD in 15 days
5.9
5.9

As a seasoned Electrical Engineer with 6+ years' experience, specializing in designing compact, low-power devices, I'm confident and excited about taking on your Ultra-Compact Safety Wearable project. My expertise aligns strongly with your requirements, especially my deep knowledge in embedded systems and small form factor PCB designing which will be pivotal for this delicate yet powerful device you envision. Over the years, I have led successful PCB designs for IoT applications, including integration of power management and various sensors like the accelerometer and capacitive touch sensors that you require. I’m also well-versed in GSM/NB-IoT modules such as SIM800C (AT commands and integration), ensuring reliable communication even during emergencies. My proficiency in BLE programming will help implement seamless connectivity to the mobile app you envisioned. I understand intimately the crucial nature of this project hence I not only bring a long list of skills to the table but also commitment to delivering high-quality work. Collaboration with mobile developers is part of my daily routine making sure my projects work seamlessly from hardware to software while clear documentation ensures smooth manufacturing and testing processes. Partner with me on this project for dedicated expertise that will reduce costs, improve performance and accelerate your time-to-market. Let’s start developing a product that will redefine safety for women all over!
$38 USD in 40 days
6.1
6.1

Hi, how are you doing? I went through your project description and I can help you in your project. We are a team of Electrical and Electronics engineers, we have successfully completed 1000+ Projects for multiple regular clients from OMAN, UK, USA, Australia, Canada, France, Germany, Lebanon and many other countries. We are providing our services in following areas: Embedded C Programming. VHDL/Verilog, Quartus/Vivado, LABView/ Multisim/PSPICE/VLSI Network Simulator NS2/NS3 Microcontroller like Arduino, Raspberry Pi, FPGA, AVR, PIC, STM32 and ESP32. IDEs like Keil MDK V5, ATmel studio and MPLab XC8. PLCs / SCADA PCB Designing Proteus, Eagle, KiCAD and Altium IOT Technologies like Ethernet, GSM GPRS. HTTP Restful APIs connection for IOT Communications. Also we have good command over report writing, I can show you many samples of our previous reports. Kindly consider us for your project and text me so that we can further discuss specifically about your project's main goals and requirements. We can deliver your project efficiently within timeline. If you choose me, I think you won't regret. Best Regards.
$38 USD in 40 days
6.1
6.1

As an electrical engineer with a strong background in designing compact, low-power devices (your project’s specialty), I perfectly align with the specific requirements and challenges of your ultra-compact wearable emergency device. My experience in PCB design (especially for miniaturized layouts) & working with sensors like accelerometers (LIS3DH) makes me well versed to ensure the device maintains a small form-factor yet retains all essential functionalities. Throughout my career, I have also delivered projects that revolve around optimizing power efficiency through Li-Po batteries and wireless charging technology --another aspect key to your project.
$38 USD in 40 days
5.5
5.5

Hey there, I love the vision behind this — creating a discreet, jewelry-like wearable that could actually save someone’s life. I’ve designed ultra-compact, low-power wearables before, so I know the challenge is balancing size, battery life, and reliable connectivity without compromising on style. I can handle everything from schematic and PCB design to firmware, making sure the nRF52832 BLE connection is rock solid and the GSM/NB-IoT backup works when it’s needed most. I’ve worked with LIS3DH accelerometers, capacitive touch sensors, and custom power management setups for Li-Po batteries with wireless charging, so efficiency and responsiveness will be top priorities. I’ll also design with waterproofing and durability in mind while keeping the form factor lightweight and comfortable. My approach is to prototype quickly, test thoroughly, and document every step so it’s manufacturing-ready. I’ll collaborate closely with your mobile developer to make sure the BLE integration with the app is seamless. At the end, you’ll have a working, tested prototype that’s elegant on the outside and reliable on the inside... Thanks. Truong...
$40 USD in 40 days
5.2
5.2

Dear Carla D., We carefully studied the description of your project and we can confirm that we understand your needs and are also interested in your project. Our team has the necessary resources to start your project as soon as possible and complete it in a very short time. We are 25 years in this business and our technical specialists have strong experience in C Programming, Electronics, Microcontroller, Electrical Engineering, PCB Layout, Product Design, Internet of Things (IoT), Embedded Systems, Wireless Charging, Prototyping and other technologies relevant to your project. Please, review our profile https://www.freelancer.com/u/tangramua where you can find detailed information about our company, our portfolio, and the client's recent reviews. Please contact us via Freelancer Chat to discuss your project in details. Best regards, Sales department Tangram Canada Inc.
$35 USD in 5 days
5.1
5.1

Best Ultra-Compact Wearable Safety Device Expert! ⭐⭐⭐⭐⭐ Hi Carla, I can help you design and prototype a discreet, ultra-compact wearable emergency device integrating an accelerometer, capacitive touch sensor, Bluetooth Low Energy and an optional GSM/NB-IoT module for reliable backup communication. With over 30 years of experience in low-power embedded systems, miniaturized PCB design, and power management, I’ll ensure your device is compact, efficient, and seamlessly integrated with your mobile app. ✅ 1. Valuable Suggestion: Use a highly integrated low-power microcontroller like the nRF52832 combined with optimized sensor fusion algorithms and a wireless charging coil to maximize battery life and maintain the ultra-compact form factor without sacrificing functionality. ✅ 2. Similar Projects: a. Ultra-small BLE wearables with sensor fusion and alerting b. Miniaturized GSM/NB-IoT enabled emergency communication devices c. Low-power IoT wearables with wireless charging and waterproofing ✅ 3. What You’ll Get: a. Complete schematic and flexible PCB layout for compact integration b. Development optimized for low power and reliable sensor reading c. Bill of Materials, prototype assembly support, and collaboration with app developers ✅ 4. Quick Question: Do you have a preferred microcontroller variant, or are you open to suggestions? Please note: This platform doesn’t allow me to message first—you’ll need to initiate the conversation. Best regards, PCB Must Innovations
$30 USD in 40 days
6.4
6.4

Hello, I am ready to take on the project for designing and prototyping an ultra-compact safety wearable device for women. The device will function as jewelry, integrating essential features like accelerometer, touch sensor, microcontroller (nRF52832 or similar), and optional GSM/NB-IoT module (SIM800C or equivalent) for communication. Using my expertise in electronic engineering, PCB design, and microcontrollers, I will ensure the device meets all requirements seamlessly. With skills in firmware development, power management, and product miniaturization, I will deliver a high-quality prototype ready for integration with the mobile app. Let's create a discrete yet powerful safety solution together. Cheers, RedBrick American Engineering
$25 USD in 23 days
3.8
3.8

I will do:- Simple to advanced Circuit design and analysis using software tools such as KiCAD, Proteus, Altium Designer, Allegro, PADs, and Eagle My package provides the following services - Schematic drawings - Gerber files - Netlist generation - Pcb's - BOM generation (Professional BOM) - 3D Models of the Actual PCB - ECAD Library Administration I will also generate Gerbers on existing PCBs files
$38 USD in 40 days
3.7
3.7

Greetings! I’m a top-rated freelancer with 15+ years of experience and a portfolio of 700+ satisfied clients. I specialize in delivering high-quality, professional safety wearable designing services tailored to your unique needs. Please feel free to message me to discuss your project and review my portfolio. I’d love to help bring your ideas to life! Looking forward to collaborating with you! Best regards, Revival
$25 USD in 40 days
3.0
3.0

Hello, Thank you for the detailed description. Where do you aim to store the sensors values in there is no BLE connection established? If these values are really important for the system's further analysis and functionalities, an external flash memory is required I'm an IoT and embedded systems engineer in a team of three engineers where I do development and design the PCB layout from components selection,and finally to manufacturing files. My two team mates do the nRF firmware development and the mobile app too. Recently we have been development a similar product wearable device that includes accelerometer and other sensors, an oled screen and an external flash memory. That's device connect to a mobile app via BLE for sensors values analysis and visualization. Feel free to contact me for further talk. Best regards.
$35 USD in 40 days
2.7
2.7

Hi Sir, I’m a hardware and embedded systems engineer specializing in compact, low-power wearable designs. I’ve worked with nRF52 MCUs, BLE, SIM800 modules, Li-Po power management, and wireless charging circuits, as well as integrating accelerometers and capacitive touch sensors into miniaturized PCBs. I can deliver your discreet jewelry-style emergency device with full schematics, BOM, PCB design, firmware, and prototype assembly, ensuring seamless BLE connectivity with your mobile app. Having experience in wearables and IoT miniaturization, I focus on both technical reliability and form-factor constraints. Let’s connect to discuss your requirements and next steps. Best regards, Chetan Mahajan Founder, ThingsLinker
$38 USD in 40 days
2.9
2.9

Hi client, Shall we discuss quickly !!! As a seasoned electrical engineer with an extensive background in designing compact, low-power devices, I am confident in my ability to create an ultra-compact and discreet wearable that meets your exact specifications for this important safety project. My proficiency in PCB design for flexible and miniaturized layouts and expertise with microcontrollers (including nRF52832), Bluetooth Low Energy programming, and GSM/NB‑IoT modules like SIM800C uniquely qualifies me for the task at hand. Furthermore, I bring to the table a lot of professional works that involved Graphic Design , 3D modeling rendering which i strongly believe comes in handy while working on your project. Overall I believe my ranging combination of skills as well as my creativity derived from 3D arts can truly make a difference to your project. Let's transform the vision of this innovative jewelry Emergency wearable into tangible reality.
$26 USD in 2 days
3.4
3.4

With my comprehensive background in electronic engineering, I have specifically honed my skills in designing compact, low-power devices, making me the ideal candidate for your wearable safety device. I am well-versed in all aspects of PCB design, but hold a special expertise in flexible and miniaturized layouts. Utilizing tools like the nRF52832 and SIM800C, I am adept at integrating immediacy-essential technologies such as the accelerometer and the capacitive touch sensor. Having developed a strong knowledge base in power management throughout my career, I'm well-equipped to handle important elements of your project such as ensuring compatibility with Li-Po batteries, wireless charging circuits and QI technology. My firm grasp on firmware development, including C/C++ proficiency, would further guarantee optimized power efficiency for your device. Best Regards Harvinder
$26 USD in 2 days
4.6
4.6

Hi Carla D., I'll complete your Ultra-Compact Safety Wearable Design in accordance with your specifications. The design that I will give you to you will be a high-end, premium piece of work that will also be visually appealing to attract the attention of your target audience. Offering my design expertise for your project makes me happy. I've successfully completed projects like this in the past thanks to my experience, talent, and originality, so I know how to handle this. Here you can see my previous work: https://www.freelancer.com/u/nimraa52 Please come over chat and discuss your requirement in a detailed way. Thank you Nimra
$38 USD in 40 days
2.0
2.0

I was excited to come across your project; it’s exactly the kind of challenge I love taking on. I specialize in crafting clean, modern, and high-performing digital solutions that make a genuine impact. While new to Freelancer, I bring real-world experience and a sharp eye for detail. Let’s connect and explore how I can help bring your vision to life. Best regards, Thomas Client name is kharlak and my name is thomas
$50 USD in 14 days
0.0
0.0

Hi, I am a full-stack AI developer with 8 years of rich experience in software development, with a background in embedded systems, microcontroller programming (nRF52832, BLE), PCB design for miniaturized layouts, low-power electronics, sensor integration (accelerometer, capacitive touch), and wireless charging circuit design. I am familiar with C/C++, IoT device prototyping, firmware optimization for power efficiency, and seamless BLE–mobile app integration. I'm an individual freelancer and can work on any time zone you want. For your ultra-compact safety wearable, I can design a miniaturized PCB, integrate the required sensors and communication modules, implement optimized low-power firmware, and ensure reliable BLE connectivity with your mobile app, delivering a complete working prototype ready for manufacturing. Please contact me with the best time for you to have a quick chat. Looking forward to discussing more details. Thanks. Emile.
$25 USD in 40 days
0.0
0.0

Olá kharlak, This project – designing a discreet, wearable emergency device – aligns perfectly with my expertise in developing compact, low-power electronic solutions. I’ve previously worked on several similar projects involving miniaturized sensors and Bluetooth connectivity, focusing on creating robust and reliable wearable tech. My background in electronic engineering and embedded systems allows me to confidently tackle the challenges of this design, including the accelerometer, BLE connectivity, and battery optimization. I’m eager to discuss the specifics and how I can contribute to a successful prototype. Would you be available for a brief call to delve deeper into the requirements?
$38 USD in 5 days
0.0
0.0

Indaiatuba, Brazil
Payment method verified
Member since Aug 31, 2009
$250-750 USD
$3000-5000 AUD
$3000-5000 USD
$30-250 USD
₹37500-75000 INR
$25-50 USD / hour
$2-8 USD / hour
₹12500-37500 INR
$25-50 USD / hour
$250-750 USD
£250-750 GBP
$750-1500 AUD
₹37500-75000 INR
$10-70 USD
₹1500-12500 INR
$8-15 USD / hour
$250-750 CAD
£20-250 GBP
min $50 USD / hour
$30-250 USD
$250-750 USD
$750-1500 USD
₹12500-37500 INR