Night light Wake up Alarm Combo circuit


Posted on Feb 7, 2014

We chose to build a nightlight combined with a wake-up alarm. Our nightlight features not one, not two, not three, not four, not five, but SIX ” yes, SIX! ” LEDs that turn on when a photosensor detects a decreased amount of ambient light. Not only that, but we also included a buzzer that plays a friendly tune whenever our system detects that a


Night light Wake up Alarm Combo circuit
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mbient light levels have increased again. The purpose of this system is twofold: First, by providing light when its surroundings are dark, it reassures and comforts those who are afraid of the dark. Second, it audibly announces the return of light to those who might have closed their eyes or otherwise lost sensory input (e. g. , the sleeping or suddenly blind). Our system is a smashing success, as it correctly lights up in the dark and plays a tune, as specified. We particularly liked the reassuring charm of the system`s adorable lights and catchy jingle. A possible improvement would be implementing a continuous alarm that the user can turn off (for example, by turning a potentiometer) ” more like a typical alarm clock. We could even include a snooze button. 1. Set up the LEDs in a line on a bread ­board next to the photoresistor. Place the speaker across the cen ­ter divider of the other bread ­board. You may find it help ­ful to con ­nect ground and +5V to the power rails of the bread ­board for the fol ­low ­ing steps. 3. Check the val ­ues out ­put by the photoresistor using the ser ­ial mon ­i ­tor and the Serial. println() func ­tion. In the code, change the PHOTO_MAX and PHOTO_MIN val ­ues as appropriate. /* Authors: jasnyder, cwhetung, menewman, jyltwo Date: 2/25/2013 COS 436 Lab L1: The Nightlight Alarm The nightlight alarm: lights turn on when it`s dark, and when it gets bright again, the lights turn off and an...




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