{"schemaVersion":1,"slug":"light-dependent-resistor","name":"Light-dependent resistor","kind":"symbol","abbreviation":"LDR","aliases":["HRE1LDR","VRE1LDR"],"category":"control-circuits","drawingTypes":["SLD","Schematic"],"referenceFamilies":["IEC","Manufacturer"],"summary":"A light-dependent resistor changes resistance according to illumination.","description":["A light-dependent resistor changes resistance according to illumination. The schematic places the sensing element in its actual electrical network and the equipment detail identifies the illumination conditions."],"readingNotes":["A surrounding light-sensitive marker describes the component response, not a supply terminal.","The preview is an original explanation of this function. Match the actual drawing convention to its legend and the selected equipment documentation."],"drawingChecklist":["State component characteristic","Identify measured circuit","Reference illumination arrangement"],"distinction":"An LDR changes resistance; a photodiode produces a different semiconductor sensing response.","facts":[{"label":"Drawing role","value":"Passive circuit element"},{"label":"Representation scope","value":"Functional concept; not an official standard graphic or a product footprint"},{"label":"Public vendor block reference","value":"HRE1LDR, VRE1LDR (Autodesk identifiers; not IEC symbol numbers)"},{"label":"Identifier status","value":"The short label is a functional lookup label, not an assigned IEC or IEEE symbol number. Any separately listed Autodesk code is a verified vendor block name."}],"references":[{"sourceId":"autodesk-resistors","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}],"related":["resistor","capacitor"],"artwork":"edu-light-dependent-resistor","publishedOn":"2026-10-13","updatedOn":"2026-10-13","provenance":"independent-public-research","url":"https://eloragrid.ai/symbols/light-dependent-resistor","illustration":{"url":"https://eloragrid.ai/library/illustrations/light-dependent-resistor.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"autodesk-resistors","title":"Resistors and heater-element symbols","publisher":"Autodesk","url":"https://help.autodesk.com/cloudhelp/2021/ENU/AutoCAD-Electrical/files/GUID-1D071951-D38E-4B15-8B9E-C30ECBD55C19.htm","type":"cad-reference","scope":"Fixed and variable resistive components, shunts and heater elements.","checkedOn":"2026-10-13","reuse":"link-only","relevance":"Public documentation of this equipment function or named vendor variant; the illustration is independently authored and is not the source graphic."}]}