Customizable PT100 Wireless Data Logger
Budget: $5,000 – $10,000 SGD
Revision 1
PT 100 Wireless Data Logger/Node for transmission on Wifi Halow
The purpose of this project is to develop the following, and then we can mass produce for our own use in the future once we have the prototypes working.
To develop a design of a wireless Node that can be deploy in real world, with a max case scenario of 60 nodes, and transmit a distance of max 300m without LOS to receiving end. Node to collect resistance from PT100 RTD, transmit resistance back to receiving end, and laptop(software) to convert resistance to temperature(°C) and show real time.
Things to be provided
1) Customized PCB Design
• Complete schematic and PCB layout, ready for fabrication.
• Include footprint libraries and design files (Gerber, BOM, Pick & Place, Assembly drawings).
• Design must integrate:
o High-accuracy ADC/AFE for PT100 (e.g., ADS124S08 / AD7124-8).
o Suitable MCU for signal processing and Wi-Fi HaLow integration.
o Proper power supply regulation for stable operation.
o All necessary connectors/interfaces.
o Built-in data buffering in node in case of network dropouts.
o Antenna for extend range
o Typical input offset: ±25 nV.
o Gain error: ±0.002% of FSR.
o Excellent drift specs: around 1.5 ppm/°C.
o Total system error can stay within or below ±0.05°C(Less RTD)
2) Complete BOM (Bill of Materials)
• Detailed list of all electronic and mechanical components with part numbers, preferred vendors, and alternatives if applicable.
• Include sourcing recommendations for any difficult-to-source items.
3) Embedded Software/Firmware for Node
• Firmware for the MCU to:
o Read RTD input via ADC.
o Apply calibration coefficients (user-inputtable).
o Convert resistance to temperature using the Callendar–Van Dusen (CVD) equation.
o Package and transmit data wirelessly via Wi-Fi HaLow module.
o Support OTA updates if feasible.
4) PC or Web-Based GUI / Data Logger Software
• Real-time data display for multiple nodes.
• Configurable logging intervals and data storage.
• Visualize live temperature readings.
• Allow input/edit of individual RTD calibration coefficients (A, B, C constants).
• Provide basic export function (CSV or similar).
• To be able to log and perform mathematical functions, like 1 min average, 1 hour average. Linear regression of last 1h(60min valve) of data and etc.
5) Conversion Functionality
• CVD equation integrated in the firmware and GUI.
• Support for individual calibration curves for each RTD channel.
• Simple UI to upload or edit coefficients.
•
6) Prototypes: 2 Final Fully Assembled & Working Units
• Fully functional, enclosure optional
• Tested to connect with your Morse Micro HaLow Link 1 router.
Things to be excluded
1) PT 100 RTDs, we will supply ourself
2) Calibration of the PT 100 RTDs, we will calibrated ourself.
3) Wifi HaLow End Module, we have a Morse Micro HaLow Link 1 Router to we want to use on the laptop end.
PT 100 Wireless Data Logger/Node for transmission on Wifi Halow
The purpose of this project is to develop the following, and then we can mass produce for our own use in the future once we have the prototypes working.
To develop a design of a wireless Node that can be deploy in real world, with a max case scenario of 60 nodes, and transmit a distance of max 300m without LOS to receiving end. Node to collect resistance from PT100 RTD, transmit resistance back to receiving end, and laptop(software) to convert resistance to temperature(°C) and show real time.
Things to be provided
1) Customized PCB Design
• Complete schematic and PCB layout, ready for fabrication.
• Include footprint libraries and design files (Gerber, BOM, Pick & Place, Assembly drawings).
• Design must integrate:
o High-accuracy ADC/AFE for PT100 (e.g., ADS124S08 / AD7124-8).
o Suitable MCU for signal processing and Wi-Fi HaLow integration.
o Proper power supply regulation for stable operation.
o All necessary connectors/interfaces.
o Built-in data buffering in node in case of network dropouts.
o Antenna for extend range
o Typical input offset: ±25 nV.
o Gain error: ±0.002% of FSR.
o Excellent drift specs: around 1.5 ppm/°C.
o Total system error can stay within or below ±0.05°C(Less RTD)
2) Complete BOM (Bill of Materials)
• Detailed list of all electronic and mechanical components with part numbers, preferred vendors, and alternatives if applicable.
• Include sourcing recommendations for any difficult-to-source items.
3) Embedded Software/Firmware for Node
• Firmware for the MCU to:
o Read RTD input via ADC.
o Apply calibration coefficients (user-inputtable).
o Convert resistance to temperature using the Callendar–Van Dusen (CVD) equation.
o Package and transmit data wirelessly via Wi-Fi HaLow module.
o Support OTA updates if feasible.
4) PC or Web-Based GUI / Data Logger Software
• Real-time data display for multiple nodes.
• Configurable logging intervals and data storage.
• Visualize live temperature readings.
• Allow input/edit of individual RTD calibration coefficients (A, B, C constants).
• Provide basic export function (CSV or similar).
• To be able to log and perform mathematical functions, like 1 min average, 1 hour average. Linear regression of last 1h(60min valve) of data and etc.
5) Conversion Functionality
• CVD equation integrated in the firmware and GUI.
• Support for individual calibration curves for each RTD channel.
• Simple UI to upload or edit coefficients.
•
6) Prototypes: 2 Final Fully Assembled & Working Units
• Fully functional, enclosure optional
• Tested to connect with your Morse Micro HaLow Link 1 router.
Things to be excluded
1) PT 100 RTDs, we will supply ourself
2) Calibration of the PT 100 RTDs, we will calibrated ourself.
3) Wifi HaLow End Module, we have a Morse Micro HaLow Link 1 Router to we want to use on the laptop end.