Fridge open door detector
Description
Our Fridge Door Sometimes Doesn'T Close Completely. To Become Aware Of A Not Correctly Closed Door Immediately (Instead Of After A Night) I Created This Open-Door-Detector. As A Side Effect You Also Get A Beep-Notification When Making Your Choice While The Door Is Open Takes Too Long ;-) The Door Open Detection Is Done By A Micro Switch. It Closes On Opening The Door And Thereby Provides Power To The Circuit Which Contains An Arduino Based Microcontroller (Atmega328) And A Spare Piezo Speaker. Note That Instead Of A Complete Arduino Board Only The Atmega328P Is Used On A Breadboard. See The [Clip By Julian Ilett](Https://Www.Youtube.Com/Watch?V=Snimcdvohom) On How To Do This. (But I Needed An Extra 10 Kohm Pullup On The Reset Pin 1 During Data Transfer.) The File "Arduinotonemelody.Ino" Contains The Program: * On Opening The Door The Led Starts To Blink. * After 10, 20 And 30 Seconds The Program Will Do 1, 2 And 3 Beeps Respectively. * After 40, 50 And 60 Seconds A Siren Sound Will Be Repeated Once, Twice And Thrice Respectively. * After 70, 80 And 90 Seconds A Short Melody Plays. * Then All Steps Will Be Repeated. See The Circuit Picture For Used Parts. * The Atmega328P Was Bought With Arduino Bootloader Programmed Which Simplifies Getting Started. * The Piezo-Speaker Was Taken From A Broken Device. * The Microswitch Closes When The Fridge Door Opens. So The Circuit Needs No Current While The Fridge Door Is Closed. It Is Soldered Onto A Piece Of Veroboard Only To Provide Stability. Openscad Files Are Included. (Including My Own Battery-Box-Design.)
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