One Kitchen Timer To Cook It All

Button with build in red/green led

Multiple small parts (Resistors, Connectors, Jumperwires,pcbs) - see fritzing

Rotary Encoder with Push-Button

Arduino Nano R3

Shift Register- Serial to Parallel

7seg 8digit led display module using max7219

General Purpose Transistor NPN

Rotary potentiometer (generic)

9V 1A Switching Wall Power Supply

Piezo speaker

<p >When preparing food I have to keep track of multiple countdowns. Even though one could solve this by putting multiple cheap timers on the fridge door or use a smartphone app there are some benefits with an extra device.</p><ul ><li >Efficient control when choosing the time (cheap timers normally just go up, higher settings are a pain, corrections after start are impossible)</li></ul><ul ><li ><span >no need to clean </span><strong >all</strong><span > your fingers to change a timer</span></li></ul><ul ><li >Smartphones normally switch of the screen, so you can't see the current state (or they keep screen on and drain the smart phone battery for neaely nothing)</li></ul><ul ><li >Alsp the smartphones somtimes is needed to check recepies, problem solutions or communicating (yes really?). Again you cannot see the current state of the timers just by looking at the device</li></ul><div class="se-component se-video-container __se__float-none" contenteditable="false" style="width: 100%;"><figure style="width: 100%; height: 56.25%; padding-bottom: 56.25%; margin: 0px;"><iframe frameborder="0" allowfullscreen="" src="https://www.youtube.com/embed/dwYkCimMoDo" data-proportion="true" data-percentage="100%,56.25%" data-size="100%,56.25%" data-align="none" style="width: 100%; height: 100%;" data-index="0" data-file-size="0" data-origin="100%,56.25%"></iframe><figcaption contenteditable="true"><div>Demo and quick guide video</div></figcaption></figure></div><h3 >Features</h3><ul ><li >Track up to 4 timers  (Well... limited by the number of display and interaction elements. You can extend this, with little modification)</li></ul><ul ><li >Main display mode shows all timers (no need to push a button to see the timers)</li></ul><ul ><li >wide range of intervals (1 second to 6 days (and thats only a coded limit) </li></ul><ul ><li >since I use an LED display it can be read from any angle and in any light situation</li></ul><p >Easy and intuitive 2 Finger Operations</p><ul ><li >Set and start timer</li></ul><ul ><li >Granularity of stepping adapts to total interval (there is normally no need to scroll over every second, when the interval is more then 10 minutes)</li></ul><ul ><li >Acknowledge alarm</li></ul><ul ><li >Change an already running timer (necessary when something irregular happened in the cooking process)</li></ul><ul ><li >put timer on hold</li></ul><ul ><li >dismiss timer</li></ul><ul ><li >check the inital time, the timer started from</li></ul><ul ><li >measure time when timer is over</li></ul><h3 >Detailed Description</h3><p ><span >For detailed insights and operation manual see the </span><a href="https://github.com/mattywausb/ElBanquos_kitchentimer/wiki">wiki in the github project.</a></p><h3 >Development process</h3><div id="gallery"><img id="gallery" src=https://projects.arduinocontent.cc/417a8570-55af-4318-8f1b-f07d910baa9d.JPG /><figcaption>first prototype in the kitchen</figcaption><img id="gallery" src=https://projects.arduinocontent.cc/3789674a-0502-4b84-a641-c11239756b2a.jpg /><figcaption>Components - Front</figcaption><img id="gallery" src=https://projects.arduinocontent.cc/a69593cf-344e-4316-8f3b-388af04b2763.jpg /><figcaption>Components - back</figcaption><img id="gallery" src=https://projects.arduinocontent.cc/81c4b783-79eb-407d-9acb-b118df6647e7.jpg /><figcaption>Breadboard-Prototype</figcaption><img id="gallery" src=https://projects.arduinocontent.cc/3ae616e6-0030-444b-beb5-9c07f95702dd.jpg /><figcaption>Final PCB-front</figcaption><img id="gallery" src=https://projects.arduinocontent.cc/3bbba9bb-b46b-4131-919c-4c409f4e5306.jpg /><figcaption>PCB - Back</figcaption><img id="gallery" src=https://projects.arduinocontent.cc/51f30167-c401-4f0c-984e-b8c01838c49f.jpg /><figcaption>All parts - ready to be assembled</figcaption><img id="gallery" src=https://projects.arduinocontent.cc/763df2c0-2884-40d1-a804-0b90fe3d8be6.jpg /><figcaption>Assembly- without button module and housing (yes the speaker was changed)</figcaption></div><h3 >Lessons learned from Prototyping:</h3><p >Putting the knob above the display is a bad idea. In general your hand and arm hide the display as soon as you grab the knob.</p><p >Using the decimal dots in the normal position is irritating. Thats why they where switched to the top in the final version </p><h3 >Far away targets</h3><p >Things that would be nice, but are far away from my capabilites and time budget to get realized </p><ul ><li >Battery powered device: Reducing power consumption without loss of readability (Reducing processor activity, replace led b other feasable technology with equivalent optical properties)</li></ul>

Fritzing Schema

Git Hub repository

My Version of ledcontrol lib

One Kitchen Timer To Cook It All

ElBanquos Kitchen Timer - having 4 channels to keep track of multiple countdowns during food preparation. Easy to operate with 2 fingers.