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I’m putting together a small outdoor rack and need an electronic sensing solution that can tell me, in real time, whether something has been placed on—or removed from—each shelf. Cameras are off-limits, so I’m looking for a clean sensor-based approach that works equally well with mixed materials such as metal, plastic, or any everyday composite an item might be made from. Because the rack will sit outside, the hardware must shrug off normal weather exposure—sun, light rain, the usual seasonal swings—but it doesn’t have to survive arctic freezes or tropical monsoons. A compact, low-power design is preferred, and I’m open to ultrasonic, IR, capacitive, load-cell, or any other sensor technology you feel is best suited to the job, provided it stays reliable outdoors. What I need from you: • A complete hardware design: schematics, PCB files (if applicable), and a clearly identified bill of materials. • Firmware or microcontroller code that flags “object present” / “object absent” events for each shelf and can push that data over a simple interface (UART, I²C, MQTT—your recommendation). • A brief test protocol showing how you validated detection accuracy with different item shapes and materials. • Installation guidelines so a non-engineer can mount, wire, and weather-proof the system without guessing. If you’ve built anything similar, a short note on the results will help me see how your approach fits this project.
Project ID: 40417080
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26 freelancers are bidding on average $122 USD for this job

I am a skilled and reliable Embedded Systems Engineer with over 6 years of hands-on experience in Arduino, ESP32/ESP8266, and microcontroller-based development. I specialize in designing efficient, stable, and scalable embedded solutions, turning ideas into fully functional hardware-software systems. I have a strong background in electronics, sensors, communication protocols (UART, I2C, SPI, MQTT, WiFi, BLE), and real-time embedded systems. My development approach focuses on clean, well-structured, and well-documented firmware, ensuring long-term reliability and easy maintenance. I also provide thorough testing, debugging, and performance optimization, including power efficiency improvements where required. I am a detail-oriented engineer with strong problem-solving skills and extensive experience in hardware debugging and firmware optimization. Beyond technical expertise, I value clear communication, meeting deadlines, and maintaining high client satisfaction. I work closely with clients to fully understand project requirements and deliver high-quality results. Pricing is flexible and can be discussed based on project scope and complexity. I am open to both short-term and long-term projects. Let’s work together to build a professional, reliable, and efficient embedded system for your needs.
$100 USD in 7 days
7.4
7.4

As an electrical engineer with expertise in electronics and embedded systems, I am well-equipped to handle your project requirement for outdoor rack detection sensors. My skills in PCB design, layout, and microcontroller coding enable me to deliver a comprehensive hardware solution precisely tailored to your needs. Whether it's an ultrasonic, IR, capacitive or load-cell sensor-based approach you prefer, I can confidently evaluate the pros and cons of each technology and propose the most suitable solution for your mixed materials rack. In my experience, digital motor control and power electronics system design also falls within my purview. This background equips me with a unique insights for designing low power consuming hardware that can effectively endure weather elements in line with your specifications. Furthermore, part of my job has involved designing robust products for the renewable energy sector which routinely face adverse climate conditions. I have a deep understanding of weatherproofing design techniques that can be easily undertaken by non-engineers during installation without compromising efficacy.
$450 USD in 10 days
7.4
7.4

I can design a reliable outdoor shelf sensing system that detects object presence and removal in real time without using cameras. The solution will use a robust sensor approach, preferably load cells with HX711 for material-independent weight detection. An ESP32 or STM32-based controller will process signals and manage multi-shelf monitoring. Firmware will implement filtering, calibration, and stable state detection (empty/occupied/removed). Data can be transmitted via UART or MQTT depending on your system preference. The hardware will be designed with weather protection, surge safety, and low-power operation. I will provide full schematics, PCB files, and a detailed BOM for manufacturing. A test protocol will validate accuracy across different object types and environmental conditions. Installation guidelines will ensure easy deployment and proper mechanical setup for non-engineers.
$155 USD in 4 days
6.8
6.8

As an electrical engineer with experience in PCB design and firmware development, I'm well-equipped to handle your outdoor rack sensing project. My expertise lies in creating innovative solutions for electronic product development, making me a perfect fit for the task at hand. I'm well-versed in different measurement techniques such as ultrasonic, IR, capacitive and load-cell which will allow me to provide you with a comprehensive hardware design that suits your needs. Additionally, my skills in low-power design will ensure that your system is energy-efficient while being reliable in the face of varying weather conditions. My knowledge of different communication protocols like UART, I²C and MQTT make data transfer seamless and hassle-free for your monitoring interface requirements. I've successfully designed rugged PCB systems before that were capable of withstanding harsh weather conditions. Your specific requirement of non-engineers being able to mount and wire up the system accurately aligns with my goal to create user-friendly designs. I will provide detailed installation guidelines so that anyone can easily set up and maintain the system. In conclusion, my proficiency in PCB design, firmware development, and my track record of excellence makes me an ideal candidate for your project. I look forward to not only meeting but exceeding your expectations while turning this idea into a successful reality!
$55 USD in 7 days
6.7
6.7

Hi, how are you doing? I went through your project description and I can help you in your project. your project requirements perfectly match my expertise. 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: Antenna Design (CST, HFSS) Embedded C Programming. VHDL/Verilog, Quartus/Vivado, LabVIEW/ Multisim/PSPICE/VLSI MATLAB/SIMULINK 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.
$55 USD in 7 days
6.1
6.1

Hi I've built outdoor presence-detection systems for mixed materials before. The hard part isn't picking a sensor—it's making it survive weather and vibration. Ultrasonic, IR, and capacitive all fail predictably outside: wind creates false echoes, sunlight blinds optics, and humidity shifts baselines. I've seen teams burn months on those before hitting the physics wall. My approach uses a physics-agnostic sensing layer with precision analog front-ends and adaptive firmware. The real value is in the signal conditioning, thermal-drift compensation, and debounce logic that reject vibration and rain impact. Mechanical isolation is equally critical—one secondary load path and the data becomes garbage regardless of electronics quality. I have a field-proven mounting and sealing protocol for exactly this. I deliver a lightweight telemetry stack (UART/usb) with on-site calibration—no bench access needed. The firmware handles rapid cycling and transient spikes, so your state flags are trustworthy in real time. Past deployments in logistics and agriculture have run through seasonal swings and light rain without drift. Clients initially looked at simple sensor kits, but the gap between a desk demo and a rugged outdoor system is in the analog integrity, mechanical isolation, and state management I specialize in. Quick call to confirm rack geometry and data endpoint, then I'll send a fixed-scope proposal. Best, Hamza
$100 USD in 7 days
5.3
5.3

⭐⭐⭐⭐⭐ I’ve built similar “presence detection” systems, and for your use case (mixed materials + outdoors), the most reliable approach is weight-based sensing using load cells—it works regardless of metal/plastic and avoids false triggers from light, dust, or reflections. Proposed solution: • Per shelf: compact load cell + HX711 amplifier • Detect “placed/removed” via weight delta (very robust) • Optional fallback: IR/ToF for redundancy if needed Electronics: • ESP32 (low power + WiFi/MQTT ready) • Weather-aware design (sealed PCB, conformal coating) • Modular per-shelf inputs (scalable) Firmware: • Auto-calibration baseline per shelf • Threshold-based detection (with debounce) • Outputs via MQTT (preferred) or UART/I²C • Event-driven (“object added/removed”) Deliverables: • Schematic + PCB + BOM (in-stock parts) • Firmware (clean, editable) • Test protocol (different weights/materials) • Simple install guide (mounting + sealing tips) Milestones: Sensor architecture + BOM Schematic + firmware base PCB + validation method Final package I’ve used this approach outdoors—very stable compared to IR/ultrasonic. Quick question: approximate weight range per shelf and number of shelves?
$55 USD in 7 days
4.5
4.5

Best Embedded Hardware Developer for Outdoor Detection Systems! ⭐⭐⭐⭐⭐ Dear Client, The real value in this project is not just sensing whether something is present. It is building an outdoor detection system that stays reliable despite weather, installation variation, and day-to-day real-world use. I can help by: 1. defining the right sensing approach and electronics around the actual rack-detection conditions 2. designing the hardware and control logic so the system is stable, practical to install, and resistant to outdoor noise and false triggering 3. preparing the prototype direction so the first build proves the right things before scaling further This keeps the project focused on dependable field behavior, not just a sensor demo. Two quick questions: 1. What exactly needs to be detected — occupancy, object presence, insertion/removal, or position state? 2. Is the first priority lowest false triggers, longest outdoor durability, or easiest installation? If you message me, I can outline the cleanest first-step architecture for a reliable prototype. Best regards, Prat PCB Must Innovations
$100 USD in 7 days
6.5
6.5

As an Electrical Engineer with extensive experience in Embedded Systems and PCB Layout, I'm confident that I can provide the solution you need for your Outdoor Rack Detection Sensors project. My wide-ranging skills include proficiency in working with different sensor technologies such as ultrasonic, IR, capacitive, and load-cell which will be of great value in creating a sensor-based approach for your mixed-material rack detection needs. Even though I am new to this platform, my experience is far from inexperienced. Before joining here, I have been successfully tackling similar types of projects including the design and implementation of similar sensing systems and my hardware expertise includes creating complete designs with well-structured schematics proven by 3D rendered designs for structural drawings and layout diagrams. Best Regards Sumit
$70 USD in 1 day
3.2
3.2

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
$75 USD in 7 days
3.1
3.1

Hi, I can design and deliver a complete sensing solution for your outdoor rack, from hardware architecture through firmware and real-world validation. I have strong experience in embedded sensing systems and low-power designs, including multi-sensor detection (capacitive, load-cell, IR/ultrasonic), signal conditioning, and robust event-based firmware for real-time monitoring systems used in challenging environments. For a problem like yours—detecting object presence across mixed materials outdoors—I would typically evaluate and combine the most reliable sensing approach (for example capacitive + load sensing or hybrid detection) to ensure stable performance regardless of material type and environmental variation. I have previously developed embedded systems involving intelligent sensing and event detection (including smart access / intelligent key-type systems), where reliability, low power consumption, and false-trigger prevention were critical—experience that directly aligns with this kind of application. My focus is always on making the system not only work in theory, but remain stable and predictable in real outdoor conditions. I’d be happy to discuss the best sensing strategy for your rack and start with a practical architecture proposal. Best regards,
$400 USD in 15 days
2.1
2.1

Hello, I can design a practical, weather-tolerant shelf occupancy sensing system that reliably detects when items are placed on or removed from each shelf without using cameras. For mixed-material objects (metal, plastic, cardboard, composites), I would focus on material-independent sensing such as load cells/weight-based detection, potentially combined with secondary sensors where needed for added reliability. This approach avoids issues common with IR or capacitive-only systems outdoors. I can provide the complete hardware solution including schematics, PCB design (if required), sensor integration, power management, and a full BOM with clearly selected components suited for outdoor use. Firmware can be developed for a low-power microcontroller with per-shelf detection logic, threshold calibration, debounce filtering, and communication via MQTT, UART, or I²C depending your preferred interface. You’ll also receive a practical validation protocol covering different item shapes, weights, and materials under outdoor conditions, plus installation guidance for mounting, calibration, wiring, and weather protection so the system is easy to deploy. My focus is on reliability, low false alarms, simple maintenance, and scalable design. I have experience with embedded sensing, PCB development, and real-world engineering constraints, which helps ensure the final system is both technically sound and practical to implement. Best regards, Engr. Muhammad Uzair
$99 USD in 3 days
1.0
1.0

Being an Electronic Engineer, Hardware Designer and a skilled PCB Designer with 3 +years of experience I make proper R&D projects Full schematics and real life single layer ,2 layers ,4 layers ,6 layer and multi-layers PCBs projects (i.e: 1:PCB of compact ear buds 2:Pcbs for compact usb with advanced security features 3:Pcbs which involves USBs 4:Also i made many large projects which handles high voltage AC and DC 5: 6 -layers PCB of Arm Cortex Processor involving Programming 6: Programmable Frequency Generator PCB 7: Compact Smart SOS PCB 8: High Volatge Ac to DC Converter with MCU STM32 programmability’s for 10KW system 9: 10KW AC Inverter with output voltage 24V 10: Qi 1.3 Wirless Charger Transmitter and Reciever 11: PCB for agricultural watering system that controls 50 fig trees with expansion capability to 100 trees) 12: Custom IO Board Design for Raspberry Pi CM5 with Integrated RP2040 And many more I have advanced level grip on softawares like Easyeda-Pro ,Kicad, Altium I will show you my PCB work separately I will handle your project and made it perfect in the best cheapest price and do its customisation First see me work then Hire me You can also see my Portfolio which reflects some of my PCBs projects In the end i will assure you that you will get professional level and great quality work in the best price Thankyou
$55 USD in 7 days
1.5
1.5

Hello, Your requirement for a reliable, outdoor-ready shelf detection system is clear, and I can deliver a robust solution using load cells per shelf combined with a low-power microcontroller (ESP32) for accurate, material-independent detection. This ensures consistent performance across metal, plastic, or mixed objects. I’ll provide complete schematics, PCB design, BOM, and firmware with real-time “present/absent” detection, publishing via MQTT. The system will be weather-resistant, energy-efficient, and easy to install with clear guidelines. I’ll also include validation tests across varied items and a simple calibration process. Estimated timeline: 7–10 days. Looking forward to working with you!
$55 USD in 7 days
0.0
0.0

Hi, ⚙️ I specialize in finalizing advanced SaaS platforms and can efficiently complete your SaasPilot-based system. ✅ Rapid Audit → Fix broken workflows (payments, AI, marketplace, bidding) ? Real AI: Python/FastAPI + OpenAI for vehicle scoring + PDF/QR reports ? Stripe Connect: Split payments, webhooks, escrow logic completed ? Live APIs: Replace mocks, ensure frontend/backend sync ? Production-ready: AWS, Redis, CDN, autoscaling prep ? Daily GitHub commits, clean PRs, video demos of real workflows. No redesign, no scope creep—just focused execution. ? Quick question: Is the Prisma schema locked, or can we adjust fields for AI scoring output? Let's get your platform launch-ready. Best regards, Thong
$55 USD in 1 day
0.0
0.0

Hi, this is a great use-case and I can build a reliable outdoor sensing system for your rack. I’ll design a sensor-based solution (likely load cells or hybrid sensing for better accuracy across materials) that detects object presence/absence in real time. The hardware will be compact, low-power, and protected for outdoor use (basic weather resistance and stable readings). I’ll provide full schematics, PCB design, and a clean BOM with easily available components. Firmware will handle detection logic and send data via MQTT/UART (as you prefer). I’ll also include calibration logic to avoid false triggers from environmental changes. A simple test plan will be included to validate performance with different objects. You’ll get clear installation and mounting guidelines for easy setup. I’ve worked on sensor-based detection systems before, so reliability and stability will be ensured. Let’s discuss shelf count and preferred communication, and I’ll suggest the best approach. Best regards, Engr. Muhammad Imran
$85 USD in 3 days
0.0
0.0

Hello, I have done two similar projects that used a microcontroller (type Arduino): - With load cells - This is basically a method of detecting an object by weighing. - With ultrasonic detection. The first method is applicable if the objects have a detectable mass and the variation of mass is within a reasonable range. Probably more reliable long term for outside use. The second method is independent of the weight but depends on the size and position of the object. A combination of the two is also a possibility off course :-). Looking forward to hearing from you, Marc. Bid by a real human!
$100 USD in 7 days
0.0
0.0

Hi there, I read your requirements carefully, and the best solution here is a clean shelf-level sensor system, not a camera-based setup. For mixed materials and outdoor use, I would recommend starting with a load-cell or capacitive/IR hybrid approach depending on shelf structure, then validating it against real items so the “object present / object absent” signal stays reliable. I can help design the full system including sensor selection, microcontroller circuit, schematics, BOM, firmware logic, and a simple communication method such as UART or MQTT. I’ll also include a practical test protocol for different shapes/materials and clear installation notes so the rack can be mounted, wired, and weather-protected without confusion. The focus will be compact hardware, low power use, weather-aware enclosure/wiring choices, and stable detection with clean event reporting for each shelf. Cost: $100 || Timeline: 2 days Payment and timeline details can be discussed further to align with your expectations. I’d be happy to help you build a reliable outdoor rack sensing solution that is practical, simple, and future-ready. Best regards, Oluwatobi Okedairo
$100 USD in 2 days
0.0
0.0

What defines “object present”? Any weight above threshold? Specific weight range? The real challenge is building a detection system that stays reliable outdoors, not just in perfect lab conditions. It must recognize items made from metal, plastic, cardboard, or mixed materials while rejecting false triggers from sunlight, rain, vibration, dust, and temperature shifts. For this application, I would recommend a load-cell/force-based design for each shelf because it detects actual physical presence by weight rather than depending on color, shape, reflectivity, or material type. I’ve built similar embedded sensing systems with load cells, signal conditioning, low-power microcontrollers, weather-aware enclosure design, filtering logic, and event reporting over UART, I²C, or MQTT. My solution would include the complete sensor architecture, schematic, optional PCB, BOM, firmware, calibration logic, and robust present/absent detection with debounce and noise filtering. I’ll also include a practical validation plan using different item weights, shapes, and materials to confirm real-world accuracy. The final result will be a rugged, easy-to-install shelf monitoring system that a non-engineer can mount, wire, weatherproof, and maintain with confidence. Best regards.
$55 USD in 7 days
0.0
0.0

Hi! Your outdoor shelf-detection system is a well-defined problem and I have a clear solution in mind. Recommended approach: Weatherproof ultrasonic sensors (JSN-SR04T) — one per shelf. Unlike IR, they're material-agnostic (metal, plastic, composite all reflect equally well) and the JSN-SR04T is IP67-rated, purpose-built for outdoor use. For a cleaner solution on multiple shelves, I'd combine this with an ESP32 microcontroller running MQTT over WiFi, giving you real-time "present/absent" events on any dashboard or home automation system. What I'll deliver: Full schematic + PCB layout (EasyEDA) or wiring diagram for breadboard prototype ESP32 firmware (Arduino/C++) — per-shelf detection, MQTT publish on state change, configurable sensitivity thresholds BOM with sourcing links Test protocol: validated across plastic bottles, metal cans, cardboard boxes at varying shelf heights Installation guide written for non-engineers — mounting, wiring, weatherproofing with standard materials Why this works outdoors: JSN-SR04T sensors are sealed, UV-resistant, and handle temperature swings well. The ESP32 will be housed in a basic IP65 enclosure. Power draw in idle/polling mode stays under 80mA. I've worked on similar IoT sensing projects and can start immediately. Happy to discuss shelf dimensions and number of shelves to finalize the design.
$55 USD in 7 days
0.0
0.0

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