Board-dat/NWI/NWI1119-DAT/2025-12-24-19-07-05.png
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Board-dat/NWI/NWI1119-DAT/NWI1119-DAT.md
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- R7 ESP32-C3 Version
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+
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+
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+
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+
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+
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+## hardware
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+
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+
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### Pin Definitions
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| Pin | Function | Note |
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![](39-39-16-07-02-2023.png)
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+
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+### functions
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+
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+ADC port - [[ADC-dat]]
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+
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+
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+![](2025-12-24-19-07-05.png)
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+
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+
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### demo video
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- https://www.youtube.com/watch?v=6Zk3WIVSvyM
materials-dat/plastic-dat/plastic-dat.md
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- [[injection-molding-dat]]
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+
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+## frication compare
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+
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+1️⃣ NBR（丁腈橡胶）
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+
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+PU (Polyurethane)
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+
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+| Material | Typical Friction Coefficient (Dry vs Metal) | Wear Resistance | Hardness Range | Key Characteristics | Typical Applications |
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+| ------------------------------ | ------------------------------------------- | --------------- | ----------------------- | ---------------------------------------------------------------- | --------------------------------------------------- |
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+| NBR (Nitrile Butadiene Rubber) | High (≈ 0.7 – 1.0) | Low–Medium | Shore A 40–90 | Very high grip, soft, good oil resistance, poor heat resistance | Drive rollers, anti-slip pads, friction seals |
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+| PU (Polyurethane) | Medium–High (≈ 0.5 – 0.8) | High | Shore A 60 – Shore D 75 | High friction with excellent wear resistance, good load capacity | Friction wheels, conveyor rollers, pressure rollers |
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+| PVC (Polyvinyl Chloride) | Medium (≈ 0.4 – 0.6) | Medium | Shore A 70 – Shore D 85 | Relatively rough surface, stable, low cost | Guide rails, low-speed friction parts |
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+
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+
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+
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+## materials compare
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+
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PU PTFE PP PA6 PE PVC FR4 PEEK Bakelite PVDF ABS NBR POM 6mm
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stainless steel / copper rod 3mm