Simple Thermostat Prototype PCB Design

@macroenergy

With my strong background in electronics and circuit design, I am confident in delivering a high-quality prototype for your simple thermostat with two thermistor temp inputs and one 220V 10a relay output. As an experienced embedded systems’ developer proficient in Arduino, Raspberry Pi, and other platforms, I assure you of utmost efficiency and cost-effectiveness in the overall design. Moreover, I have a good grasp on analog design, power electronics, and PCB design which are all relevant to this project. My primary goal is to create a user-friendly thermostat that can run your water chiller efficiently. With this in mind, I plan on incorporating a LCD display with a ribbon connector for panel mounting. The LCD will not only display the two temperatures but will also indicate the relay status, providing you with comprehensive information at a single glance. Given that temperature adjustments aren’t required, I will ensure to build an intuitively simplified interface. To ensure optimal safety measures are in place, I will incorporate your particular requirements into the design. The hysteresis function, preventing rapid switching of the relay as well as shutting down when temperatures exceed 35°C significantly protects your equipment. My ownership of hardware costs as part of my service package further guaranteeselecting me for this project would be prudent since you only need to pay for my time and shipping expenses

@Adeel2k14

I understand the project requirements and can help you develop a fully functional prototype. I have more than 8 years of experience in PCB design and firmware development, with hands-on expertise in prototype and product development. I can also share samples of my previous work for your reference. I will provide you with a reliable and cost-effective solution tailored to your requirements. Looking forward to hearing from you. Regards, Muhammad Adeel

@hayteekeys

HI, KINDLY READ THROUGH MY PROPOSAL I will deliver a complete, reliable, and low-cost prototype thermostat for your water chiller: two thermistor inputs, 220V 10A relay output with proper hysteresis and high-temperature safety override, plus a separately mountable LCD display on ribbon cable showing water temp, air temp, and relay status. MY APPROACH ✅ Phase 1: Schematic design using Arduino Nano/Pro Mini + NTC thermistors, 220V relay module with opto-isolation, and I2C LCD on ribbon cable. ✅ Phase 2: Firmware development with hysteresis (ON >8°C, OFF <6°C), air temp >35°C safety shutdown, and clean LCD output. ✅ Phase 3: Build & test one working prototype, ship to you with full source code, wiring diagram, and calibration guide. RELEVANT PROJECT • Multiple simple industrial thermostats with dual NTC sensors, relay control, hysteresis, and remote LCD DELIVERABLES • Fully assembled & tested prototype (shipped to you) • Complete Arduino sketch (well commented) • Schematic, wiring diagram, and BOM • Short user/calibration guide Fixed price for design + build + shipping: $280 USD (includes all my time, components, and shipping; you only pay for any extra hardware if needed later). QUESTIONS 1. Do you prefer Arduino Nano, Pro Mini, or another platform? 2. Any specific thermistor model/value (10k NTC standard)? 3. Ribbon cable length needed for LCD (e.g. 30cm, 50cm)? Ready to start immediately.

@leonidye

Hi, I can design and build this thermostat prototype with dual thermistor inputs, 230V 10A relay control, and a remotely mountable LCD display connected via ribbon cable. The controller will implement the required hysteresis logic for water temperature regulation and include independent over-temperature protection using the second sensor. I will provide complete PCB design, firmware development, prototype assembly, and functional testing. The system will be designed using a cost-effective and reliable microcontroller platform suitable for long-term operation. Special attention will be given to safe relay switching, stable temperature sensing, and compact board layout. I can also provide documentation and wiring details to support future revisions or production. I am available to start immediately and can deliver the prototype within a short turnaround time. Regards.

@cnarvaez1957

Hello... I can help. I have extensive experience with temperature sensors, particularly thermistors, and signal conditioning hardware. I work with PIC, Arduino, and ESP32 microcontrollers. I handle physical assembly and testing using breakboards or simulators. I work with LCD displays and 220V AC/5VDC or 220V AC/3.3VDC power supplies. I provide schematics, firmware, simulations, and physical testing. Feel free to contact me with any questions. Regards.

@hamzazayyad

Hi I can design and build this thermostat prototype for you. I have more than 15 years of experience in electronics, MCU programming, PCB design, electronic system design, and HVAC system design. I have developed custom embedded controllers, relay control systems, industrial monitoring devices, and temperature-control products, so this project fits my expertise very well. I fully understand the required operation:- - 2 thermistor inputs - 230V 10A relay output - Water temperature control with hysteresis - Over-temperature protection using second sensor - LCD display showing water temp, air temp, and relay status - Separate LCD connected via ribbon cable for panel mounting - Fixed setpoints with no user adjustment needed Example: `10 28 1` = Water 10°C, Air 28°C, Relay ON Control logic: - Relay ON if water temp > 8°C - Relay OFF if water temp < 6°C - Relay forced OFF if air temp exceeds 35°C I can provide: - Schematic design - PCB design - Firmware development - Prototype assembly/testing - Reliable relay protection and sensor filtering - Complete source files and documentation To keep cost low and reliability high, I would likely use a compact MCU-based design instead of a Raspberry Pi. The system can be powered from an external transformer exactly as requested. I can build the full working prototype and ship it ready for testing. Thank you Best Regards Hamza Elecronics Engineer

@debosx

Hello! I'm a highly skilled PCB Designer with over 10 years of expertise in delivering reliable and efficient PCB designs. I specialize in creating precision designs tailored to client's needs, utilizing top-tier design tools such as Altium Designer, Autodesk Eagle, KiCad, EasyEDA, Siemens PADS, DipTrace, Allegro/OrCAD, Fritzing and Proteus. My goal is always to ensure the highest quality and performance in every project. Core Expertise : • Schematic Capture & Layout Design • Component Selection & Library Management • Reverse Engineering (PCB Replication, PCB Cloning) • Gerber, BOM, and CPL File Generation & Manufacturing Support • Design for Manufacturability (DFM) and Design for Assembly (DFA) • PCB Design & Development (Single, Double, Multi-Layer, Flexible PCBs) Industries Served : • Medical Devices • Telecommunications • Consumer Electronics • Industrial Equipment • Automotive Electronics • Safety and Security Devices Why Choose Me? • Attention to Detail and Commitment to Quality • Strong Communication Skills & Client-Centric Focus • Timely Delivery & Flexible Approach to Meet Project Requirements I would love to help you with your next PCB design project. Feel free to reach out, and let’s discuss how I can bring your ideas to life! Best Regards, Utpal

@yaroslavmark

Hi, I reviewed your thermostat controller requirement and it aligns strongly with my experience in embedded control electronics, industrial temperature monitoring, and relay-driven automation systems. I’m an embedded hardware engineer with 15+ years of experience, having designed thermostat controllers, sensor-monitoring systems, and industrial relay interfaces using Arduino, STM32, ESP32, and custom embedded hardware. Approach: ✅ I will design a compact controller with dual thermistor inputs, hysteresis-based relay control logic, over-temperature shutdown protection, and isolated 230V relay switching. ✅ I will implement a simple panel-mount LCD interface over ribbon connection displaying water temperature, air temperature, and relay status with stable sensor filtering. ✅ I will optimize the design for low-cost reliable production using robust relay protection, proper grounding, noise suppression, and serviceable connectors. ✅ I will deliver the complete schematic, PCB, firmware, prototype assembly, and tested hardware ready for integration with your external power transformer. Questions: ✅ I need to confirm preferred LCD type/size and approximate ribbon-cable length requirement. ✅ I want to verify the thermistor specifications or whether standard 10k NTC sensors are acceptable. ✅ I need clarification on relay type preference (mechanical relay vs SSR) for the 230V chiller load. Best, Yaroslav

@Feriver

Hello, I understand you need a simple thermostat prototype PCB with two thermistor inputs, a 220V 10A relay output, and a separate panel-mount LCD display, designed to control a water chiller with fixed hysteresis logic (8°C ON / 6°C OFF) plus a safety cutoff at 35°C based on air temperature monitoring. I will design a cost-effective embedded solution using an Arduino-class microcontroller (or equivalent low-cost MCU) with a robust thermistor sensing circuit, relay driver stage with proper isolation, and a ribbon-connected LCD module for panel mounting. The firmware will implement stable hysteresis control for water temperature and an independent safety override for overheating protection, ensuring reliable operation and avoiding relay chatter. I will also deliver a complete PCB design ready for fabrication, including schematic, BOM, and layout optimized for safety around 220V switching, along with firmware code and assembly guidance. The system will be designed for simplicity, reliability, and low-cost prototyping while ensuring clean temperature display and stable relay control. Ready to start immediately. Thanks, Asif

@tetianam8

⭐⭐⭐⭐⭐ This is a very straightforward and reliable control project, and I can build it as a compact prototype with simple, serviceable hardware. Proposed approach: • Small MCU platform (Arduino Nano / ATtiny / ESP32-C3 depending on cost) • 2x thermistor inputs with calibrated voltage-divider sensing • 230V 10A relay output with proper isolation and snubber protection • Panel-mount LCD connected via ribbon cable • Fixed hysteresis logic exactly as described: • Relay ON when water temp > 8°C • Relay OFF when water temp < 6°C • Immediate relay shutdown if air temp > 35°C LCD example: • “10 28 1” = Water 10°C / Air 28°C / Relay ON Deliverables: • Fully assembled/tested prototype • Schematic + wiring documentation • Firmware source code • BOM • Basic test procedure • Ready-to-mount LCD ribbon solution I can keep the design intentionally simple for reliability and low cost while still using: • Isolated relay driving • EMI suppression for compressor loads • Clean thermistor filtering to avoid false switching Experience includes: • Thermostat/control systems • Relay-driven HVAC/chiller controls • Sensor monitoring hardware • Arduino-based industrial prototypes

@mahmoudralizadeh

Hello We are a powerful and professional team in the field of the required objectives of your project . Our team recommends using the ESP8266 chip for your project. We have all the hardware components and will run your project's hardware and software in our office and send you a video. We will provide full support for your project for the next three months. If you wish, we will discuss more details. With hope for cooperation

@ansarccet

I have gone through the requirements and I think I should be able to complete the job and fulfill all the requirements. I will help to build cost efficient hardware and programming logic without compromising with the quality and deliver the fully tested version with detailed QC report. Looking forward to discuss and hear back from you.

@engrhasan01

Are you looking for someone to design and build a simple dual-sensor thermostat controller with a separate LCD display for monitoring and control of a water chiller system? I’m an Electrical and PCB design Engineer with experience in microcontroller-based control systems, relay switching, and temperature monitoring circuits. I can design a low-cost, reliable prototype using a simple MCU platform with clear logic control and safe 230V relay isolation. System Behavior • Relay ON: water temp > 8°C • Relay OFF: water temp < 6°C • Emergency OFF: air temp > 35°C (always priority) • LCD shows real-time values + relay state Display Format Example • Water Temp / Air Temp / Relay Status (e.g. 10 28 1) Approach • Define sensor + MCU selection (cost-optimized) • Design schematic with proper isolation for mains relay • Develop firmware logic with safety priority handling • Build prototype PCB or perf-board version • Test and validate switching behavior Deliverables • Circuit design files (KiCad / similar) • Firmware source code • Wiring + assembly diagram • Working prototype-ready design • LCD interface layout guidanc Best regards, Hasan

@ahmedy607

Hi, I can design and prototype the thermostat system, including the main control PCB, remote LCD module with ribbon connection, relay control logic, and firmware. I have experience with embedded control systems, temperature sensing, relay-driven loads, and compact PCB design using low-cost microcontroller platforms such as Arduino and ESP-based systems. The design will include: • Dual thermistor temperature monitoring • 230V / 10A relay control with hysteresis logic • Over-temperature protection shutdown at 35°C • Simple remote LCD display showing both temperatures and relay status • Ribbon-cable connected display for panel mounting • Complete schematic, PCB files, BOM, firmware, and prototype-ready hardware The solution will be optimized for simplicity, reliability, and low overall cost. Best regards, Ahmed

@MicroKid

Hi, I will complete the industrial-level design, including both the schematic and PCB layout, within 5 days. After receiving the PCBs, I will complete the assembly and firmware development within an additional 2 days. Following prototyping and testing, which will take approximately 2 more days, I will ship the finished prototype to you. The design cost is $100, excluding prototyping and shipping costs. Best regards,

@TokaElkomy93

Hi, I have reviewed the specifications for your water chiller thermostat. I can design and build a robust, cost-effective prototype that handles your dual-temperature logic and relay control with high reliability. Technical Approach I will develop a custom control board featuring: Dual-Input Logic: Fixed hysteresis (On >8°C, Off <6°C) for water temp and a safety "Kill-Switch" for air temp (>35°C). Power Handling: A 10A-rated relay with proper trace isolation to safely manage the 220V load. Modular LCD: A 16x2 or OLED display connected via a ribbon cable for easy panel mounting, showing real-time temps and relay status. Hardware Choice: I suggest an Atmel/Arduino-based architecture for maximum reliability at the lowest cost. Critical Project Questions Thermistor Type: Do you have specific NTC thermistors (10k/100k) in mind, or should I select and calibrate the board for a standard model? Display Distance: How long should the ribbon cable be for your panel mounting? Power Input: What voltage will you provide to the board (e.g., 5V, 9V, or 12V DC)? Relay Load: Is the 10A load inductive (compressor) or resistive? This determines if a snubber circuit is needed to protect the relay. As an Electronics Engineer, I will ensure this prototype is safe, precise, and easy to integrate. Best regards, Toka Ahmed

@alluankit01

✨ Hi, I can design and build the simple thermostat prototype PCB for your water chiller with two thermistor inputs, relay control logic, and a separately mounted LCD display. I have experience with Arduino style controllers, thermistor sensing, relay control, LCD interfaces, PCB design, embedded logic, hysteresis control, and prototype testing. I’ll design the system so the relay turns ON when water temperature is above 8°C, turns OFF below 6°C, and is forced OFF if the air temperature exceeds 35°C. I can keep the design simple and low cost, with an external transformer supply, ribbon connected LCD for panel mounting, clear temperature and relay status display, and proper safety separation around the 230V 10A relay section. Best regards Ankit ✨

@ElectrixLab

Hi, I can design and build this thermostat prototype for your water chiller system. Features: 2 thermistor inputs (water + internal air temp) Relay ON above 8°C, OFF below 6°C Over-temp protection: relay OFF if air temp >35°C 230V 10A relay output Remote LCD on ribbon cable for panel mounting External low-voltage power input I would use a low-cost Arduino-based MCU solution for fast development and reliability. Deliverables: Working assembled prototype PCB, schematic, and firmware files Tested before shipping

@alexsanderg3

Do you prefer a ready-made relay module for the prototype, or should I design the relay driver circuit directly on the board? I can build this as a simple reliable chiller thermostat using an Arduino Nano or similar low-cost controller. The design will read two thermistors, show water temperature, air temperature, and relay status on a separately mounted display, and control the 230V 10A relay using your fixed logic. The water sensor will turn cooling ON above 8°C and OFF below 6°C, while the air sensor will act as a safety override and immediately disable the relay above 35°C. I will keep the firmware clean, commented, and easy to adjust later if you ever want different thresholds. I can deliver the prototype design, wiring/schematic, firmware, tested relay behavior, LCD display output, and short build notes. Hardware and shipping can be billed separately as requested. Thank you.