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Published June 25, 2019 © CC BY-SA

Egg Timer with a Button Kit

Have your eggs always perfectly boiled just as you like them. With this solution that is simple and customizable.

BeginnerFull instructions provided1 hour782

Things used in this project

Hardware components

HARDWARIO Push Button Kit

HARDWARIO Radio Dongle

Software apps and online services

HARDWARIO Playground

Node-RED

Blynk

Story

I was bored, that I had to look up for how long the eggs should be in the water for them to be boiled just fine. So I looked it up one last time. I put it in Node-RED and now I just use my HARDWARIO IoT Kit Push button kit every time I want to cook some eggs.

1. Build hardware

You will need the Push button kit, it is really easy to assemble. Just put Battery Module, then Core Module and on top of it goes the Button Module. This simple assembly is also shown in the video below.

1 / 2 • All modules needed

Assembly video

This is all the hardware you will need for this project.

2. Flash firmware

Download HARDWARIO Playground.
If you bought the PushButtonKit you will receive the Core Module with the firmware on it.
Otherwise you can see documentation page on how to flash the firmware with HARDWARIO Playground.
You will need the bcf-radio-push-button firmware for this project.

3. Pair Core Modules

If you bought the Starter Kit you will receive everything paired and ready for use.
Otherwise you will have to pair it yourself. You can follow the guide in the documentation

4. Import function

Open Node-RED in the Playground or Raspberry Pi and import the flow from here. Go to the Menu -> Import -> Clipboard. Do not forget to hit "Deploy" in the top right corner to apply the changes.

You can leave the flow as it is but there are a lot of possibilities for customization. You can customize the times if you have some better recipes than me :). I used times from this website.

You will customize the time by opening the Start message function, you can change the value of a timeRemaining variable from '240' to anything else you want, the value is in seconds.

Of course, the messages are customizable too, just change the values in the array of messages that are located in the Cooked Message Node.

5. Blynk integration

This project is ready for Blynk integration. How to set up Blynk with your HARDWARIO Playground is described in this guide.

Follow the guide if you want to make your own blynk app. If you want to use the one specified for this project in the Blynk app click this Icon and scan the QR code bellow.

This Blynk application sends you a notification when you press the button so you make sure that you have your phone near. After that it waits some specified time and notifies you when the eggs are ready.

Also, you see seconds remaining before next cooked state and current cooked state.

If you want to stop cooking at any time just press the button, if the color of it is green the cooking is done and you are ready to use this application again when needed.

Summary

You can use other included functions of Push button kit and this firmware like thermometer or accelerometer.

It sends orientation of the device to the Node-RED so you can play with that and trigger some actions with it.

Check the temperature in your kitchen with it, it does the measurements every few minutes and sends the temperature to the Node-RED as well.

Feel free to ask any questions about this project.

Visit HARDWARIO page on hackster.io for more interesting projects or go directly to their website
Go to HARDWARIO documentation to learn more about their modules and other possibilities of the platform.
Try more firmware from HARDWARIO Playground or write your own, it is easy to start.
Because everything is Open source you can get all firmware on GitHub, get some inspiration and try to make your own applications.
Get your own HARDWARIO Hub to replace your computer in this project so you have always access to your applications.
Check out more applications that can be used with HARDWARIO IoT Kit in Integrations section.

NODE-Red function

[{"id":"da0afbb.6fc8b08","type":"mqtt in","z":"7acaf9ea.56c958","name":"","topic":"node/push-button:0/push-button/-/event-count","qos":"2","broker":"e649966c.8c2af8","x":230,"y":220,"wires":[["3a78d85f.3954d8"]]},{"id":"55cd1535.41ff2c","type":"blynk-ws-out-notify","z":"7acaf9ea.56c958","name":"","client":"baded7a7.d63938","queue":false,"rate":5,"x":990,"y":200,"wires":[]},{"id":"3d3dace8.0bd054","type":"function","z":"7acaf9ea.56c958","name":"Start message","func":"msg.payload = \"Cooking started\";\nflow.set('timeRemaining', 10);\nflow.set('eggsState', 0);\nreturn msg;","outputs":1,"noerr":0,"x":740,"y":200,"wires":[["55cd1535.41ff2c","3576c0d0.c1145","a95cdba1.f1a058"]]},{"id":"9193ff49.34c03","type":"function","z":"7acaf9ea.56c958","name":"Delay Timer","func":"var i = flow.get('timeRemaining');\ni--;\nflow.set('timeRemaining', i);\nmsg.payload = i;\nreturn msg;","outputs":1,"noerr":0,"x":750,"y":380,"wires":[["1897a1b3.89b1be","a580113d.ee4b1"]]},{"id":"e63b9b33.84f958","type":"blynk-ws-out-notify","z":"7acaf9ea.56c958","name":"","client":"baded7a7.d63938","queue":false,"rate":5,"x":1390,"y":260,"wires":[]},{"id":"49e4d731.16b188","type":"blynk-ws-out-write","z":"7acaf9ea.56c958","name":"","pin":"1","pinmode":0,"client":"baded7a7.d63938","x":1240,"y":340,"wires":[]},{"id":"1897a1b3.89b1be","type":"delay","z":"7acaf9ea.56c958","name":"","pauseType":"delay","timeout":"1","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":980,"y":380,"wires":[["49e4d731.16b188","55a2150d.eae03c"]]},{"id":"a580113d.ee4b1","type":"function","z":"7acaf9ea.56c958","name":"Cooked Message","func":"var eggState = [\"soft-boiled\", \n                \"slightly soft-boiled\", \n                \"custardy boiled\", \n                \"creamy hard-boiled\",\n                \"firm creamy hard-boiled\",\n                \"firm hard-boiled\",\n                \"overcooked\"];\nif(flow.get('eggsState') == 6)\n{\n    flow.set('finished', 1);\n    msg.payload = 1;\n    return msg;\n}\nelse if(msg.payload === 0)\n{\n    var eggStateNum = flow.get('eggsState');\n    flow.set('timeRemaining', 3);\n    msg.payload = \"Eggs are \" + eggState[eggStateNum];\n    flow.set('eggsState', ++eggStateNum);\n    return msg;\n}","outputs":1,"noerr":0,"x":1010,"y":300,"wires":[["cb190879.dc1cb8"]]},{"id":"3eeeac6b.d35f14","type":"blynk-ws-out-write","z":"7acaf9ea.56c958","name":"","pin":"2","pinmode":0,"client":"baded7a7.d63938","x":1420,"y":300,"wires":[]},{"id":"55a2150d.eae03c","type":"function","z":"7acaf9ea.56c958","name":"Timer Stop","func":"if(flow.get('finished') != 1)\n{\n    return msg;\n}","outputs":1,"noerr":0,"x":1230,"y":380,"wires":[["9193ff49.34c03"]]},{"id":"e7c161b0.b4ee6","type":"blynk-ws-in-write","z":"7acaf9ea.56c958","name":"","pin":0,"pin_all":0,"client":"baded7a7.d63938","x":870,"y":100,"wires":[["2acaaf0b.75958"]]},{"id":"2acaaf0b.75958","type":"function","z":"7acaf9ea.56c958","name":"Button handler","func":"flow.set('finished', parseInt(msg.payload));","outputs":1,"noerr":0,"x":1120,"y":100,"wires":[[]]},{"id":"e0f7bf48.21bdb","type":"blynk-ws-out-write","z":"7acaf9ea.56c958","name":"","pin":0,"pinmode":0,"client":"baded7a7.d63938","x":1290,"y":160,"wires":[]},{"id":"3576c0d0.c1145","type":"function","z":"7acaf9ea.56c958","name":"","func":"flow.set('finished', 0);\nreturn msg;","outputs":1,"noerr":0,"x":990,"y":160,"wires":[["e0f7bf48.21bdb"]]},{"id":"a95cdba1.f1a058","type":"blynk-ws-out-write","z":"7acaf9ea.56c958","name":"","pin":"2","pinmode":0,"client":"baded7a7.d63938","x":1020,"y":240,"wires":[]},{"id":"3a78d85f.3954d8","type":"function","z":"7acaf9ea.56c958","name":"Is cooking check","func":"if(flow.get('finished') !== 0)\n{\n    return msg;\n}","outputs":1,"noerr":0,"x":530,"y":220,"wires":[["3d3dace8.0bd054","9193ff49.34c03"]]},{"id":"cb190879.dc1cb8","type":"switch","z":"7acaf9ea.56c958","name":"","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"1","vt":"num"},{"t":"else"}],"checkall":"false","repair":false,"outputs":2,"x":1190,"y":300,"wires":[["e0f7bf48.21bdb"],["e63b9b33.84f958","3eeeac6b.d35f14"]]},{"id":"e649966c.8c2af8","type":"mqtt-broker","z":"","name":"","broker":"127.0.0.1","port":"1883","clientid":"","usetls":false,"compatmode":true,"keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","closeTopic":"","closeQos":"0","closePayload":"","willTopic":"","willQos":"0","willPayload":""},{"id":"baded7a7.d63938","type":"blynk-ws-client","z":"","name":"Egg Timer","path":"ws://127.0.0.1:8080/websockets","key":"2b2f7cde19a44660bd83a8a632c40320","dbg_all":false,"dbg_read":false,"dbg_write":false,"dbg_notify":false,"dbg_mail":false,"dbg_prop":false,"dbg_sync":false,"dbg_bridge":false,"dbg_low":false,"dbg_pins":"","multi_cmd":false,"proxy_type":"no","proxy_url":""}]

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Egg Timer with a Button Kit