...adjust membership privileges. --- ## 2. API Request Rate Limiting ### 2.1 Tier-Based Limits - **Differentiated Limits**: - T1: 5 req/sec, 100/min; T2: 10 req/sec, 200/min; T3: 15 req/sec, 300/min; T4: 20 req/sec, 500/min; T5: special/custom limit. - **Implementation**: - Use middleware in Golang (or API gateways) to enforce per-IP, account, and API key limits. ### 2.2 Circuit Breaker and Throttling - **Circuit Breaker**: - Triggered on consecutive failures or abuse patterns, with thresholds adjustable by tier. - **Throttling**: - Use token bucket or leaky bucket algorithms to smooth out traffic peaks. --- ## 3. API Access Monitoring and Logging ### 3.1 Log Recording - **Details Recorded**: - Log source IP, request parameters, HTTP method, stat...
...实现电源管理模块，设计低功耗电路（锂电池供电）。 设计阻抗检测与反馈模块，确保电流强度根据皮肤阻抗自动调整。 提供电路的安全保护功能（如过流、短路保护）。 打样电路板并进行初步测试，确保电路功能正常。 技术要求： 经验丰富的电子电路设计背景，熟悉低频电刺激器的电路设计（TENS或类似设备经验尤佳）。 熟练掌握微控制器（如STM32、ESP32）和DAC控制信号生成。 有PCB设计经验，能独立完成从原理图设计到打样测试的全流程。 熟悉电流放大、阻抗检测及反馈回路的设计与应用。 能够使用仿真软件（如PSpice、LTSpice）进行电路仿真验证。 2. 外观设计师： 职责： 设计一款适合佩戴在脖子上的设备外观，确保舒适性和稳定性。 根据人体工程学设计电极与颈部的贴合部位，确保设备电极能够精确贴合迷走神经位置。 提供初步3D模型或草图，展示设备外观和电极位置的布局。 设计设备外壳的防水防汗功能（IPX4或更高标准）。 考虑设备的便携性、用户友好性及时尚美观性，适合日常佩戴。 技术要求： 具备可穿戴设备设计经验，了解人体工程学及佩戴舒适性设计要求。 熟练使用3D建模软件（如SolidWorks、AutoCAD、Fusion 360等）。 能够提供从概念到最终产品的完整设计方案。 有过医疗设备、电子产品设计经验者优先。 其他要求： 工程师和设计师将需要紧密协作，确保设备的内部电子元件和外观设计能相互适应。 项目需要在规定的时间内按时交付原理图、PCB打样和初步设计草图。 欢迎有相关领域经验的个人或团队投标。 项目预算： 预算面议，视经验和能力而定。 项目时间： 预计设计和打样时间为4-6周。 联系方式： 如果你有兴趣参与这个项目，请提供相关的工作经验、成功案例以及预期的工作时间和预算要求。
我有路由器上下壳需要设计： 1.尺寸是250X160X50mm; 2.接口包括5个以太网口，3个USB A type,一个DC插座，一个复位按钮； 3.顶部中央有圆形LED指示，直径50mm； 4.带两个扬声器，开口朝下； 内部PCB 参考附件。 要求： 设计简洁有几何艺术感，文件格式SKP
CAM 350 相关版本工程专业 ***************************** panelized 专业小时 界面GPIO或 FPC链接布线 双面混六层 没有太多责任高求 快速完成~付款‘套餐’ 写个脚本 价钱另议
有4款PCB需要重新设计（修改），尺寸和厚度及工艺不变，现有线路图中有2个圆圈的意思是2个圈之间放反光杯，灯珠排列不能超出内圈范围
...智能不是庞大的功能 智能不是复杂的操作 智能就是让生活更简单 革命性的三段延时关闭功能，以简短的操作，满足您的各种需求 多种控制方式，适应您所忽略的生活习惯 轻按打开，长按打开，全按打开，多种控制方式 独家专利智能手势识别，防误操作 独家同状态双控设计，让您的生活更简单 独家双控设计 典雅的呼吸灯设计，渐亮渐暗间，仿佛智能有了生命，为您的家装画龙点睛。 优质的用户体验需要强大的硬件支撑。 开关面板、触控面板、防静电保护板、电子芯片组、PC阻燃底座 基于3毫米加厚钢化玻璃材质，弧线凹槽精致研磨，打造最舒适的触摸感受，轻松实现盲操作。 兼具防水功能，使您的家人更安全。 3毫米加厚钢化玻璃材质 曲面弧线凹槽精致研磨 兼具防水功能，使您的家人更安全。 超标不计成本大尺寸触控原件，实现多方式精准操作 强弱电隔离，信号无损传达，正真做到“芯”领神会。 进口KB-A级双层PCB电路板； 30ms之内触摸响应速度， 进口触摸芯片Atmel 固体钽电容； 专业星型防干扰布线设计 德国拜耳进口PC材质 最高阻燃等级V0 配音/欧盟CE标准为您的安全加分。 几十次的试模，只为确定最合适的宽度 几十次的打样，只为做出最完美的弧度 几十次的手板，只为确定最佳的边缘倒角 几十次的样品，只为确定最均匀的导光板制作方案 每一次零点几毫米的改进，都是工程师们对细节的极致追求 寓智能于简单，隐科技于无形，究品味于细节 润泽细腻的圆角设计、时尚倒角设计、适合人体工程学，弧线凹槽 COOLTOUCH充分考虑到了不同的装修风格，精心设计了几种不同款式，提供丰富的个性化选择，智能与艺术的结...
*** OVERVIEW *** - Ten US dollars per hour. - One hour per day (or per night). - You will help me design, code, and develop an IoT product using MicroPython running on an ESP32 microchip. - You do *not* need any experience with microcontrollers, electronics, electrical engineering, mechatronics, Arduino, PCB, circuit design, or Python. - If Freelancer.com prevents you from bidding on this project or if you want to avoid “spending” one of your Freelancer bids you can apply "passively” for this project by pasting "MicroPython_ESP32_11_September_2019" into your Freelancer profile. Please see the section below in this posting called *** APPLYING "PASSIVELY" *** for more information. *** LOCATION *** You must live the Western Balk...
I'm looking for a skilled PCB engineer who can help us with the process of PCB fabrication preferably from China we are trying to setup a small pcb fabrication setup for RnD purpose and looking for someone who have done DIY pcb earlier and can explain things related to Photoresist, etching, Via Plating and solder mask process also should be able to send us actual makin video doing the pcb by themself. mostly the via plating. looking to make trace width of 0.1mm with 0.1 mm spacing.
...can design a small mixed-signal PCB using FLUX .ai. The primary function of this circuit will be for STM32 or ESP32. Key Requirements: - Proficient in designing mixed-signal circuits - Experienced with FLUX .ai - Capable of designing small PCBs Ideal Skills: - PCB design - Schematic creation - Signal processing expertise - FLUX .ai proficiency The PCB dimensions are flexible. The PCB should be designed to be USB-powered. Please prioritize the placement of essential components based on power and signal requirements. The PCB should support both analog and digital I/O connections. The PCB should be designed to fit a custom enclosure. The PCB should support high-speed operation for the STM32 or ESP32. The dimensions for the custom ...
I need a simple PCB designed for professional audio equipment. This board will not have any active circuits; it will primarily serve as a distribution point for audio signals using Phoenix Connectors. Key Features: - The board will need to accommodate 5 or more audio channels. - All audio inputs, through, and outputs will be in parallel. - The design must be compatible with Phoenix Connectors. - The board dimensions should fit within standard 19-inch rack sizes. I'd like to request a quote for "A simple Phoenix Block PCB board . Using 6 in-line 45 degree angle 6 position blocks in 3 sets in parallel on board that max size 8 inches wide by 6 inches tall. 18 phoenix blocks total , with enough holes for stand offs to mount inside enclosure . Needs to be robust No act...
I need help modifying my Eagle PCB design. The changes involve: - Adjusting the copper across all layers to align with the Gerber files. - Making routing adjustments to ensure the design matches the Gerber. The ideal freelancer for this project should have a deep understanding of PCB design and routing, particularly with Eagle software. Experience with Gerber files and copper layer adjustments is crucial. Please provide examples of similar projects you've completed in your proposal.
I'm in need of a professional CAD drafter with expertise in low voltage electrical and telecommunications systems. The end deliverables should be comprehensive construction drawings to include annotating circuit paths on floor plans, riser diagram, rack elevations, etc. Ideal Skills and Experience: - Proficient in CAD software - Specialization in low voltage electrical and/or telecommunications drafting - Experience in creating construction drawings - Understanding of voice and data system components and cabling - Attention to detail and accuracy - On time delivery
...version of the logo, possibly including the company phone number (0449 588 233) and tagline (Electrical Contracting). The design should be bold, clean, and readable from a distance. Style & Inspiration: Professional, minimal, and modern. Must reflect trust, quality, and electrical expertise. Open to subtle symbolic elements that reinforce the electrical industry (e.g., lightning bolt, plug, or circuit-inspired details). Deliverables: Facebook Logo: Optimized for profile use. T-Shirt Design: Two versions – front (small) and back (large with phone number). All files in vector format (AI, EPS, SVG), plus PNG and JPG. Additional Notes: I have attached my current logo as a reference. I am open to minor adjustments in typography and layout for a sharper, more polished look. I...
...us/item/ Motion Software: Control Board: Motor Drivers: Camera: Motion Sensors: A circuit diagram and reference images are attached for clarity....
I need a professional PCB designer who can create a medium-sized PCB (up to 10x10 cm) from a simple schematic. The PCB will utilize both through-hole and surface-mount components. Ideal Skills: - Expertise in PCB design - Proficiency in using various PCB design software - Experience with both through-hole and surface-mount component design. Please note, while I have not specified a preferred PCB design software, familiarity with and ability to use multiple software will be beneficial. Your creativity and expertise will be crucial in optimizing this design for functionality and manufacturability.
I'm looking for a seasoned CAD professional to help me create an electrical schematic for a commercial building. The project involves designing various electrical parameters like load calculations, circuit design, and wiring diagrams. Skills and experience ideal for this job include: - Proficiency in CAD, specifically for creating electrical schematics - Experience with commercial building electrical design - Ability to conduct precise load calculations - Expertise in circuit design - Competence in developing comprehensive wiring diagrams
...Ideas for Consideration: Icon / Symbol: - Minimalist & Geometric Design: A clean, structured icon representing guidance and progress. - Stylized Forward Arrow or Step Symbol: A visual cue for "One Step" and forward motion. - Abstract Migration Path: A smooth, curved line (possibly around a globe) to indicate international movement. - Tech-Inspired Elements: Subtle AI/machine-learning motifs like circuit patterns or a digital wave. Typography Ideas for Consideration: - Bold: A modern, high-tech look that is readable and scalable. - Slightly Rounded Corners: A balance between approachability and sophistication. - Subtle Customization: A letter (possibly “O” or “S”) could be stylized to integrate the step/movement concept. Color Palette Ideas ...
I'm seeking assistance with designing a drone that includes a transmitter and receiver. The project involves creating a modulator for the transmitter capable of...modulation scheme. Key project components include: - The data will be sourced from an Arduino in binary form and needs to be modulated with a sine wave for transmission. - The drone will communicate its speed to a controller. - An analysis of the characteristics of both linear and non-linear amplifiers through a modulator at the transmitter end. Ideal skills for this project: - Proficient in circuit design and PCB creation. - Experience in working with Arduino and drone technology. - Knowledgeable in both linear and non-linear amplifier characteristics. Please provide a quote and specify any additional requ...
...looking for an experienced hardware engineer to design an RFID reader with Wiegand output. The project includes: - Development of an electronic circuit - PCB (Printed Circuit Board) design - Preparation of all manufacturing files (Gerber, BOM, Pick & Place) - Prototyping and testing of a working unit The goal is to develop fully functional hardware that will work with the firmware we provide for proof of concept. # Requirements: ✅ Experience in electronic circuit and PCB design ✅ Knowledge of RFID technologies (13.56 MHz) and Wiegand interface ✅ Designing circuits with LED indicators, buzzer, and other necessary peripherals ✅ PCB optimization to fit a provided enclosure ✅ Generating all necessary manufacturing file...
I'm in need of an experienced PCB designer who can create a double-layer PCB for a consumer electronics project. Key Components: - The PCB will require a power management module to ensure efficient energy use and longevity of the device. Skills and Experience: - Expertise in designing double-layer PCBs, particularly for consumer electronics. - Proficient in incorporating power management systems into PCB designs. - Familiarity with industry standards and best practices for PCB design. - Excellent problem-solving skills and attention to detail.
I'm looking for an expert to wire 5 buttons with 5 LED 7-segment counters. The buttons will be manual push buttons, and their function will be to increment the count on the LED counters. I already have the components including Arduino Uno R3 Boards t...The buttons will be manual push buttons, and their function will be to increment the count on the LED counters. I already have the components including Arduino Uno R3 Boards that are pre-programmed with a time delay so the buttons cannot be spammed. I need to understand how the circuit works and how it is wired properly. Wires have been disconnected and it is not working at this time. Ideal Skills: - Proficient in working with 7-segment displays - Experience with wiring manual push buttons - Knowledge of basic circuit des...
Project Title Schematic & PCB Design for ATmega32U4 + PCF7991 125 kHz Transponder Reader with USB Interface Project Overview I am looking for a skilled electronics engineer or PCB designer to create a schematic and PCB layout for a device that uses: ATmega32U4 (5 V, native USB support, 44TQFP package) PCF7991 RFID base station IC (operating at 5 V, 125 kHz) USB interface for communication with a PC (no external USB–serial chip required) This device will transmit and receive data at 125 kHz for transponders (e.g., automotive immobilizer tags) using the PCF7991 and a coil antenna. The ATmega32U4 will handle the low-level bit-banging, timing, and decoding, while appearing as a USB CDC device (virtual COM port) on the PC side. I have existing Arduino-based cod...
I have a reverse-engineered bidirectional amplifier PCB designed for use in tunnels. However, it is currently failing to achieve the required transmission distance coverage of 350 meters. I need experienced electronics engineer or RF (Radio Frequency) specialist to troubleshoot the issue, identify the root cause, and implement the necessary fixes to ensure the amplifier meets the desired performance specifications. • Analyze the existing PCB design and identify potential issues causing the reduced transmission distance. • Perform signal strength and quality tests to diagnose the problem. • Propose and implement design modifications or component replacements to improve performance. • Ensure the amplifier meets the required transmission distance of 350 meter...
I'm seeking a skilled professional with extensive experience in Fusion 360 for PCB design. Although I haven't specified the particular type of PCB work or the industry it's intended for, I require someone who can handle all aspects of PCB design, including schematic creation, PCB layout, and 3D modeling of the PCB. Ideal candidates would possess: - Proficiency in Fusion 360, specifically in PCB design - Strong understanding of schematic design and PCB layout - Experience in 3D modeling of PCBs - Ability to work with both custom and standard components
...and multiple voltage rails (1.2V, 1.8V, 2.7V, 10V). • Minimize heat dissipation and power loss in wearable conditions. 4. PCB Design & Prototyping • Design a compact, flexible PCB suitable for smart glasses. • Implement best practices for high-speed signals, RF design, and power integrity. • Generate Gerber files, BOM, and manufacturing documents. 5. Firmware & Communication Framework (Optional, but a plus) • Assist with low-level firmware development for FPGA, Bluetooth, and sensor integration. • Provide sample code for Bluetooth communication and camera interfacing. Deliverables: 1. Updated Circuit Schematic (with necessary modifications). 2. Optimized PCB Design (Altium/KiCad/Eagle, including Gerber files). ...
I'm looking to develop a pair of on-ear, wearable headphones. Ideal skills for this project include: - Electronics engineering - Audio technology expertise - Wearable technology design experience - Proficiency in consumer electronics Please provide relevant past projects in your proposal.
I'm looking for an experienced PCB designer and programmer to help with a project in industrial machinery. The PCB will primarily process data from sensors, so experience with data processing is crucial. Additionally, the PCB will need to be compatible with the Field-Oriented Control (FOC) motor method. Ideal skills and experience for the job: - PCB design experience - Programming expertise - Familiarity with industrial machinery - Understanding of sensor data processing - Knowledge of Field-Oriented Control The expected timeline for the project is 1-2 months. The project requires detailed documentation for both the PCB design and programming. The PCB should use the RS485 communication protocol for interaction with the sensors.
I'm seeking a skilled electronics designer to create a PCB for a consumer electronics project. It should incorporate standard LEDs and sensors. Key Requirements: - Expertise in PCB design for consumer electronics. - Proficiency in integrating standard LEDs and sensors onto a PCB. - Prior experience with designing PCBs for consumer electronics is crucial. - Understanding of LED and sensor specifications and requirements. The ideal candidate should be capable of designing a flexible and reliable PCB that meets the needs of a consumer product. I look forward to your proposal.
Project Title: Experienced RF Circuit Trainer Required for Comprehensive 3-Month Program Description: I am an experienced professional specializing in power supply and OP-AMP design. I am seeking a seasoned RF circuit trainer to provide an in-depth, structured learning program covering fundamental and advanced RF circuit design concepts. The training will span three months, focusing on both theoretical knowledge and practical application, including the use of industry-standard tools like Advanced Design System (ADS). Training Objectives: The program should comprehensively address RF circuit design, analysis, and simulation techniques. Specific topics to be covered include: 1. Fundamentals of RF Circuit Design: - Core RF principles: Transi...
...emphasis on overall system coordination, high voltage, low voltage, as well as the operation of onboard sensors, turbo generators, and diesel generators. Key Components of the Prompt: - Overall System Coordination: The prompt should guide the engineer in understanding and managing the ship's power distribution and control systems. - Low Voltage Components: Specific attention should be given to circuit breakers, distribution panels, wiring diagrams, and troubleshooting methods related to low voltage systems. - Onboard Sensors: The prompt must cover all sensors included on board, with particular emphasis on their roles and importance in the power management system. Ideal candidates will have: - Extensive experience in electrical engineering, particularly within the maritime ...
I'm looking for an experienced MATLAB professional to help me build a mixed-signal circuit primarily focused on power management. This circuit will utilize transistors, capacitors, and microcontrollers. Ideal candidates should: - Be proficient in MATLAB software - Have extensive experience with mixed-signal circuit design - Be familiar with power management circuits - Have good knowledge of working with transistors, capacitors, and microcontrollers. Your task will be to design and simulate the circuit in MATLAB, ensuring its functionality and efficiency for power management. Deliverables include a comprehensive circuit design, simulation results, and recommendations for real-world implementation.
I'm seeking a skilled...seeking a skilled and dedicated developer to design a physical PCB for managing power from a 220v AC and DC source. The primary function of this PCB will be power distribution. Key Aspects: - The PCB must be able to effectively distribute power from a 220v AC and DC source. - I have specific components in mind for this project, so familiarity and experience with them will be a plus. - Components required on the PCB include Transformers, Capacitors, Mosfets, and an esp32. Ideal Skills and Experience: - Proven experience in PCB design and development. - Proficiency in working with power distribution PCBs. - Familiarity with the specified components: Transformers, Capacitors, Mosfets, and esp32. - Ability to design a robust ...
*** OVERVIEW *** - Ten US dollars per hour. - One hour per day (or per night). - You will help me design, code, and develop an IoT product using MicroPython running on an ESP32 microchip. - You do *not* need any experience with microcontrollers, electronics, electrical engineering, mechatronics, Arduino, PCB, circuit design, or Python. - If Freelancer.com prevents you from bidding on this project or if you want to avoid “spending” one of your Freelancer bids you can apply "passively” for this project by pasting "MicroPython_ESP32_11_September_2019" into your Freelancer profile. Please see the section below in this posting called *** APPLYING "PASSIVELY" *** for more information. *** LOCATION *** You must live th...
My motherboard for an EDM machine is having issues that I suspect are caused by component failure, particularly with Integrated Circuits (ICs). I have partially identified a faulty IC but need confirmation and assistance to pinpoint the exact issue. Key requiremen...with Integrated Circuits (ICs). I have partially identified a faulty IC but need confirmation and assistance to pinpoint the exact issue. Key requirements: - Experience in diagnosing and repairing motherboards, particularly for EDM machines - Ability to identify and replace faulty integrated circuits - Experience with soldering and desoldering components - Good understanding of electronics and circuit boards Please note that I am looking for someone who can not only help troubleshoot but also repair the motherboard ...
...today that the IoT will not both send and receive at the same time. It should be in receiving mode most of the time. It should send lines 203 to 214 whenever a keystroke is made- generally several seconds or more apart. This will be sent to an APP that I am hoping to create on MIT apps. The APP will add information and then send to a database. The software is attached. We have a proprietary PCB and keypad. The rest of this was created by your website. I'm seeking an experienced developer to modify my Nano 33 IoT, which currently operates in Central Mode, to also function in Peripheral Mode. The main goal is to facilitate device communication with smartphones and tablets. The device will need to transmit status updates, so the ability to efficiently manage data tran...
...html?gatewayAdapt=glo2usa4itemAdapt Motion Software: Control Board: Motor Drivers: Camera: Motion Sensors: I attached a circuit diagram in case it is helpful. The goal is for the stage to automatically track larval zebrafish, like that shown in an attached picture, so that the fish stays in a focused view of the Ti2 microscope, which has a camera in it. In case another camera sensor is needed, I got one that'll be put on a tripod and connect to a laptop via usb. I'd like complete Python coding to achieve this goal. I
Hi, this is the to be the PCB design quotation. The PCB of the power supply circuit is required to be designed with the Schematics. Software simulation files and PCB will be delivered.
...Espressif's ESP32/ESP32-S2/ESP32-S3. It can be controlled via a mobile app or a game controller over a Wifi network. Key aspects of the project include: - Testing the ease of control via the mobile app - Assessing the responsiveness to the game controller - Testing that the esp32 drone code actually works - using basic components to test functionality. For example testing on LED's for each motor. - Test PCB Gerber files online as well The ideal freelancer for this project should have: - Experience with Espressif esp drone - Extensive experience in functionality and usability testing - A strong understanding of ESP32 technology - Proficiency in evaluating mobile applications and game controllers. Please note that I only require testing services, all code and contro...
I'm looking for a talented mobile app developer to create a Smart Home Automation app for both iOS and Android. The server and database are MQTT-based and already set up at a given address. This app will connect with PCB via MQTT, enabling users to control various types of switches (2-node, 4-node, 6-node). Key Features: - Switch Control: Users must be able to control their home switches through the app. - User Registration and Login: The app should offer a secure and easy-to-use login and registration system. - Real-time Updates: The app should provide real-time updates to the users about their home status. UI Style: The app requires a modern and interactive User Interface (UI). So, experience in UI/UX design is a plus. Skills and Experience Required: - Proficient in cross...
I'm looking for an experienced PCB designer to help me design a PCB for a consumer electronics project. The project is still in its early stages, so I need someone who can not only design the PCB, but also help with the overall project development. Ideal Skills and Experience: - Proficiency in PCB design software (e.g., Altium, Eagle, etc.) - Experience in designing PCBs for consumer electronics - Understanding of electronic components and their functions - Good communication skills for project collaboration - Experience in project development would be a plus.
I need a small PCB case designed to protect it from physical damage. The case should be made of plastic, specifically designed for durability. Ideal Skills: - Experience in industrial design - Proficiency with CAD software - Knowledge of material properties, specifically plastic durability Please note, I have not specified a particular type of plastic, so I am open to suggestions based on your expertise.
I'm looking to create an interactive, user-friendly film submission platform tailored for filmmakers aiming to submit to film festivals. This website will not only serve as a submission portal but also as a showcase for films and a hub for festival information. Key Features: - Submission Form: A comprehensive and easy-to-use submission form for filmmakers. - Film Show...on creating interactive platforms. - Experience in building user registration systems and integrating payment gateways. - Knowledge of how to design an engaging film showcase gallery. - Ability to keep the website updated with festival information. - Skilled in creating user-friendly, intuitive submission forms. Your expertise will help filmmakers navigate their journey in the film festival circuit with ease ...
I'm in need of a PCB designer. The specifics of the project will be clarified once we connect.
I need an expert in PCB design using Fusion 360 to route a high-frequency communication bus between SDRAM and a microcontroller. The design should prioritize optimized signal integrity and involve placement of power decoupling capacitors. Key Requirements: - Design a 6-layer PCB (the layers are already defined in the provided file). - Route the majority of signals on the Top layer (Layer 1) and Signal layer (Layer 4), with some signals allowed on the Bottom layer (Layer 6). - Place power connections on Vcc (Layer 3) and Gnd (Layer 2 & Layer 5). - Use 8 mils vias (Hole size), 4 mils traces, and a clearance of 12 mils (preferably). - Ensure the bus signal has matched lengths and impedance (50 ohms, Minimum Frequency: 90 MHz). - Follow best practices for signal matching and...
