Outdoor Concrete Yield-Stress Sensor
Budget: $750 – $1,500 USD
I’m developing a thin capacitive patch that can sit directly on fresh concrete and track yield-stress development in real time. The goal is true continuous monitoring on construction sites—rain, dust and daily temperature swings included—so the design must be rugged enough to last several months until the slab reaches full strength.
Here’s what I need from you:
• A complete electromechanical design of the capacitive sensor array, including plate geometry optimized for yield-stress sensitivity, dielectric selection and all sealing / encapsulation details for reliable outdoor use (targeting at least IP65 performance).
• Production-ready documentation: schematics and PCB layout (Altium or KiCad), mechanical drawings, full BOM with sourcing notes, and fabrication files.
• Embedded readout electronics and firmware (Arduino, STM32 or similar) capable of logging high-resolution capacitance changes the analogue input card in plc for site-wide collection.
• Calibration procedure and sample code to convert raw capacitance into yield-stress values, validated with a small concrete test rig.
• One fully assembled prototype plus photos/videos of bench and in-situ tests confirming stable operation for a minimum of four weeks.
I’ll handle large-scale field trials once the prototype is proven; clear, well-commented files and repeatable build instructions are therefore critical acceptance criteria. If your background spans sensor physics, outdoor electronics packaging and low-noise analog design, let’s talk timing and the best route to hit these deliverables.
Here’s what I need from you:
• A complete electromechanical design of the capacitive sensor array, including plate geometry optimized for yield-stress sensitivity, dielectric selection and all sealing / encapsulation details for reliable outdoor use (targeting at least IP65 performance).
• Production-ready documentation: schematics and PCB layout (Altium or KiCad), mechanical drawings, full BOM with sourcing notes, and fabrication files.
• Embedded readout electronics and firmware (Arduino, STM32 or similar) capable of logging high-resolution capacitance changes the analogue input card in plc for site-wide collection.
• Calibration procedure and sample code to convert raw capacitance into yield-stress values, validated with a small concrete test rig.
• One fully assembled prototype plus photos/videos of bench and in-situ tests confirming stable operation for a minimum of four weeks.
I’ll handle large-scale field trials once the prototype is proven; clear, well-commented files and repeatable build instructions are therefore critical acceptance criteria. If your background spans sensor physics, outdoor electronics packaging and low-noise analog design, let’s talk timing and the best route to hit these deliverables.