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Duotone panel — violet briefing on the left, lime-sealed detail sheet on the right.
12V DC Solenoid for Electric Door Lock Node MCU ESP8266 V3 (LOLIN CH340 chip) Maximum Pin Access: All available Maximum Pin Access: All available GPIOs including ADC and basic electronics for students and hobbyists Fail Secure Design: The bolt remains extended (locked) when power is off and retracts (unlocks) when 12V is applied ensuring security during power outages providing reliable locking without continuous power
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