Articles
Sign holders for COVID-19 prevention
Compared to other countries, Japan did not enforce a strict lockdown on its population during the COVID-19 pandemic. As a result, most bars and restaurants continued their operations as usual. However, in order to prevent the spread of the virus as much as possible, the staff of my local pub printed out signs asking customers to not leave their table without wearing a mask.
Multi-user MQTT platform
Mosquitto is usually the first candidate to come to mind when looking for an MQTT broker. However, by default, Mosquitto manages users using a password file. This makes it difficult to easily add or remove users, especially when the broker is deployed in Kubernetes.
Camera viewer
IP cameras are cheaper than ever and with the ESP32-CAM boards it is now possible to stream video for less than USD 10. However, IP cameras are commonly either only accessible from within their network, or use servers from third party companies to allow users to see the video feed from anywhere in the world. As both scenarios are inconvenient, I decided to create a camera viewer application that can proxy the video feed to a web interface.
DWC hydroponics system
I am not much of a cook so salads are usually one of my favorite options for a healthy meal. So, just like for everything else, I started wondering if I could make my own. However, I don't have access to a garden so I started looking into solutions to grow vegetables indoors. I settled for hydroponics, which seemed to provide a good balance between yield and operational hassle. Specifically, I went for a Deep Water Culture type of hydroponic system as it is usually considered easy for beginners to setup.
An RFID ring as a front door key
Global warming and the COVID-19 pandemic are some the many challenges humanity is having to face. However, I somehow decided that the problem I was going to solve is having to take my keys out of my pocket whenever I lock or unlock my front door.
MongoDB K8s manifest
Here's a simple manifest to deploy MongoDB with data persistence in microk8s:
Cert-manager Certificate Issuer
With cert-manager installed, SSL certificates can be automatically obtained for Ingresses deployed in a Kubernetes cluster. To achieve this, one must deploy the appropriate ClusterIssuers to the cluster. Here are example manifests to do so.
K8s NGINX Deployment for Ingress test
An NGINX container can be quite useful to test whether one's Kubernetes setup is working. Here is one example manifest file that deploys such container with an appropriate service and ingress.
IoT pan-tilt platform
With the COVID-19 pandemic, many of us cannot participate in family gatherings or other similar events in person. Instead, some opt for video-call applications like zoom, but then get constrained to the field of view of camera of the device used for the call.
Encrypting Mosquitto using Certbot
This article presents how to encrypt a Mosquitto MQTT broker using SSL certificates obtained with Let's Encrypt