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  1. R

    Arduino Nano built in RGB LEDs won't turn off

    Most likely: the RGB LEDs are active-low, so you must set the pins to OUTPUT and write HIGH to turn them off. Leaving them unconfigured or writing LOW keeps them on. Check your board's pin numbers (Nano 33 BLE: R=22/G=23/B=24; Nano 33 IoT: R=25/26/27) — classic Nano (328P) has no on-board RGB.
  2. R

    How is coating wear on ESD tweezers typically assessed in production environments?

    For critical lines, they combine a resistance threshold test + visual check on a regular cadence (e.g., monthly or before each batch).
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