How to Connect and Calibrate a High Voltage Sensor for Arduino Projects

The discussion focuses on connecting and calibrating a high voltage sensor for Arduino projects, specifically addressing circuit design and visual voltage indication using LEDs. The original poster shared a circuit diagram created with Digi-Key Scheme-it and sought recommendations for tri-color LEDs, including part numbers. Suggestions included using multiple LEDs or an LED bar to indicate voltage ranges, similar to audio level meters. The circuit involves high-value resistors (2MΩ and 1MΩ) and capacitors, with breakover diodes rated at 28V each to achieve a total breakover voltage around 300V. The user aims to measure voltages from 0 to 50kV but experiences issues with LED blinking frequency becoming too fast to discern beyond 2kV. Questions were raised about the tolerance of tri-color LEDs to such high voltages. Advice was given on proper wiring techniques in Scheme-it and general compatibility of tri-color LEDs without specifying exact models.
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