ldr - Electronics Area https://electronicsarea.com Electrical and Electronics Tutorials and Circuits Thu, 26 Dec 2024 15:51:34 +0000 en-US hourly 1 https://wordpress.org/?v=4.9.26 Light sensitive alarm using LDR https://electronicsarea.com/light-sensitive-alarm-using-ldr/ https://electronicsarea.com/light-sensitive-alarm-using-ldr/#respond Mon, 21 Aug 2023 12:00:39 +0000 http://electronicsarea.com/?p=3322 This alarm activates when the illumination level changes from almost total darkness to a moderately high illumination level. When this happens the alarm is locked and the alarm signal, be it a light or a sound, remains active.

The post Light sensitive alarm using LDR first appeared on Electronics Area.

The post Light sensitive alarm using LDR appeared first on Electronics Area.

]]> https://electronicsarea.com/light-sensitive-alarm-using-ldr/feed/ 0 Fridge Door Alarm Circuit https://electronicsarea.com/refrigerator-door-alarm-circuit-two-555-timers/ https://electronicsarea.com/refrigerator-door-alarm-circuit-two-555-timers/#comments Sat, 07 May 2022 19:16:10 +0000 http://electronicsarea.com/?p=1299 Refrigerator door alarm circuit with two 555 timers

This refrigerator door alarm circuit alerts you when the door has been left open. Very important, because the power consumption increases when this happends. It uses the popular 555 timer IC

The post Fridge Door Alarm Circuit first appeared on Electronics Area.

The post Fridge Door Alarm Circuit appeared first on Electronics Area.

]]> https://electronicsarea.com/refrigerator-door-alarm-circuit-two-555-timers/feed/ 2 Shadow detector alarm circuit with two LDRs https://electronicsarea.com/shadow-detector-alarm-circuit-with-two-ldrs/ https://electronicsarea.com/shadow-detector-alarm-circuit-with-two-ldrs/#respond Sun, 30 Aug 2020 17:08:32 +0000 http://electronicsarea.com/?p=1351 Shadow detector alarm circuit with two LDRs

This circuit detects if there is a difference of lighting between two LDRs, and sends an audible and visual warning. Circuits that use two LDRs are more reliable than those that use only one.

The post Shadow detector alarm circuit with two LDRs first appeared on Electronics Area.

The post Shadow detector alarm circuit with two LDRs appeared first on Electronics Area.

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