Kevin van den Broek

My Cocktail Handbook

My Cocktail Handbook is my first android application I ever made. The application gives the user the possibility to search over 3000 different cocktail recipes and see the instructions on how to create the cocktail. The user can also favourite the cocktails so that they are always within reach trough the 'favourites' tab in the navigation drawer.

The application also offers a My Bar functionality. It looks at the ingredients you selected for your bar and then shows the cocktails you can create! lastly, are you just interested in Vodka? Click the ingredient and a list with cocktails containing vodka is shown!

• Developer: Kevin van den Broek
• Date: 2017
• Language: Java, Android

FlipDot matrix board

For a microcontrollers assesment Harmen and I interfaced an old Brose flipdot matrix board. We integrated a Wemos D1 Mini into our circuit to host a website that can be used to send text over wifi to the flipdot board. This way we can enter and edit text that has to be shown on the flipdot. When the Wemos receives a request to change the text it sends the text over serial to a BigAVR6 which then processes this and redirects each character over I2C to the flipdot board. After that process is finished the text will begin to scroll from right to left.

• Developer: Harmen Leusink, Kevin van den Broek
• Date: 2017
• Language: C + Arduino

ESP Microcontroller

I do different projects with the ESP microcontrollers. I make my dumb bedroom lightning smart using MQTT with a ESP8266-12f and I am making my garage door open with a MQTT command. Recently I also started using the ESP32. A microcontroller that has bluetooth capabilities. Lastly I am integration a lot of sensors and lightning into Home Assistant to automate my home!

• Developer: Kevin van den Broek
• Date: 2017
• Language: c++, Arduino

Stress reduction bracelet

For a graduation project, Tim Dekker researched convenient and child-friendly ways of measuring stress levels for kids, especially those of refugees. When he wanted to make a prototype with Arduino, he reached out to me. I helped Tim design an Arduino program that uses a galactic skin response sensor together with an old iphone vibration motor and lastly, an old fashioned led.

The purpose of this program was to measure stress levels and reduce them using a method Tim researched.

• Developer: Kevin van den Broek
• Requested by: Tim Dekker
• Date: 2017
• Language: c++, Arduino

OpenGL 3D Game

In my last semester of my second year I had a OpenGL assignment to create a 3D scene. I chose to create a 3D game in a world that is genereted with a black/white heightmap image. I used different methods to smoothing the terrain in code, using a 3x3 1/9 boxfilter, and I used a Guassian blur to smooth the image in image editing software.

The game features a main menu, where you could read the instructions and press a button to start the game. When you press any button the game would start instantly because when you get into the main menu the game itself was already loaded in the background.

The main feature of the game is the collecting of sunflowers, this is to gather points. However, collecting sunflowers is not as simple as it looks. When the game starts there will spawn 2 'Boo's' (Known from nintendo). These ghosts will slowly kreep towards you using linear interpolation. When you collide with these ghosts it is game over.

• Developer: Kevin van den Broek
• Date: 2017
• Language: c++, OpenGL (legacy)

Smart Meter Dashboard

The application is developed using the MEAN stack. This is the MongoDB, ExpressJs, Angular5 and NodeJs stack. The deployment of the application is fully automated using Docker. This dashboard provides a clean interface, which is fully responsive, to provide insight into your Dutch smartmeter. This smartmeter provides energy information every 10 seconds, this data is read by a Single Board Computer using a Python script.

This is the main page of the dashboard. The information that can be seen here is your live (Last 10 minutes) energy usage (red) / solar panal production (green). The data on the left side is your total usage since the installment of your smart meter with a corresponding pie chart. On the right side is your usage of the current day, this also updates live as does the main chart. The charts are made using ChartJs.

This is the history component, on this page all the data that has been gathered can be seen using the date picker on the left. Initially all the data from one day will be shown, if a more precise graph is desired the two time pickers can be used to narrow down the data.
The 2 pie charts on the right show you the total usage since the data you are currently shown and the total usage of the time shown period (one day maximum).

• Developer: Rick van Fessem and Kevin van den Broek
• Date: 2018
• Language: Angular5, ExpressJs / NodeJs, MongoDB, Docker, Javascript, Typescript

KaraokeJam

This application was developed while abroad in Stuttgart, Germany. It is a progressive web app that enables people do karaoke together. The frontend is develop with Vue.JS and uses multiple different technologies. The backend is develop completely with Go, and the architecture that was used is microservices. For storage of data we used a combination of Redis and mongoDB.

This is the landing page of the application. Users get to decide wether they want to create a new room, or join an existing one. When hosting one themselves, the backend creates unique keys and sends these back to the frontend. Whenever someone wants to join a karaokeroom, they press the join button. This shows a camera that tries to read QR codes. These QR codes are generated by the room host using the QR button.

This is the main screen that everyone can see. It shows you a song queue search on the left, the main screen in the center and the current queue is at the bottom. The song search uses the spotify API, the main screen uses the youtube API and the queue is a custom implemented system in our backend. This uses websockets to maintain a live queue for all users.

• Developers: Martijn de Voogd and Kevin van den Broek
• Date: 2019
• Technologies: Vue.JS, Docker, Docker-Compose, AWS, Continues Integration, Continues Development, Go, Websockets, Redis, MongoDB.