Willem L. Middelkoop MSc BICT
IT business owner, investor and software developer
from the blog:
Collecting health data with Biostrap
Wearing a clinical-grade photoplethysmography (PPG) sensor for a month
Most wearables (smartwatches, fitness trackers, etc.) use very basic sensors to capture heart rate. Their signal is binary: just counting beats. Biostrap is different, instead of just checking pulses, it captures a high-fidelity PPG waveform. These waveforms are the same kind that doctors use, making me wonder what I could learn from them!
From tree to table
Designing and creating a night stand
Right next to the house were I was born there was this chestnut tree, sadly it died one and a half year ago. When it was taken down, my brother saved me a slab of wood. I intended to create something from it, a nice "do it yourself" adventure, worthy of a blog post!
Saving a MacBook Air with exploded battery
Don’t try this at home - but I did
Last night I had a nasty surprise: my original MacBook Air was swollen due to an exploded battery. I immediately had to take action, for reasons of safety and to preserve this piece of modern computer history. Don’t try this at home, but if you do... read along for some practical tips.