A Personal Notebook
WebAssembly-based Camera Document Scanning App. The idea is, once the app is loaded on the device, the user can capture an image using a phone’s camera, the app then does some processing and converts it to PDF. All these steps are done without communicating with any backend server, and using a virtual machine inside the … Read moreWeekend Project: WebAssembly Camera Document Scanner
What to expect from a book on software architecture nowadays? Before reading this book I made some assumptions about would be recommended in this book: microservices, containers and the usual after-the-fact known concepts. Plus, as with other similar books as you read you tend to agree with common-sense-non-actionable ideas which make you nod while reading … Read moreBook Review: Fundamentals of Software Architecture
Source: https://tinyurl.com/covid-estimator
The is an early and unfinished version of an experiment to read a typical barcode using single pixel (photodiode).
The motivation behind this post is a personal experience I had with my washing machine. I (like any typical Amazon user), was looking for a washing machine in the price range I was ready to pay for, then checked the specifications, and finally the user reviews. Based on these criteria I made the decision and … Read moreCan Amazon reviews prove planned obsolescence of a product?
⚠️WARNING: do not touch components connected directly to the AC mains. This post is for educational purposes only, and I am not responsible for the correctness or safety of the information given here! Many producers of so-called air fresheners, sell the device at cost price or maybe even at loss. The business model is similar … Read moreTeardown of a 3-way air freshener
Nowadays, people carry their phones everywhere, even while exercising at the gym. Only recently have equipment manufacturers noticed this and started to add a phone holder. For the time being, however, people put their phone on the floor or on top of the weights. Many wearable fitness trackers already provide functionality of counting equipment exercise … Read moreCounting Reps and Measuring Exercise Quality (using Smartphone’s Accelerometer)
For some reason the plastic parts holding the legs of my IKEA “Martin” chair were broken. So I created a replica using OpenScad:
Many lens used with CCTV cameras have motorized zoom and focus. The position of focus or zoom can be determined using a potentiometer. The idea here is to implement a simple closed-loop controller that would quickly set the zoom/focus to the correct position upon user command. In many servo motors with position feedback, the controller … Read moreMotorized Zoom/Focus Lens Controller