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The other day, I found myself putting on some weight. This rather surprised me as I thought I was having a healthy diet and exercised almost daily. To identify the root of the problem, I decided to start measuring my calorie intake as well as the macronutrients that constitute said intake.

I've been using&nbsp;<a href="https://www.home-assistant.io/" rel="noopener noreferrer nofollow">Home Assistant</a>&nbsp;to control my home IoT devices for a while. Although it fulfills all my needs, I wanted to make my own system so as to get a fully customized smart home control panel and learn how to build such an application in the process.

A Node.js application which stores data from IoT devices sent over MQTT into an InfluxDB time-series database. It allows the management of multiple data sources into a MongoDB database.

A company I worked for had a coffee machine for which employees could purchase coffee. However, the payment was done by putting coins in a jar. Not only did this present the obvious risk of theft, this system was also impractical for people not carrying spare change at all time. I decided to solve this issue by designing this cashless payment system.