Don’t be boring.

Moodbot Case Study

How to come up and talk about your hardware ideas.

Michal Malewicz
6 min readSep 18, 2023


MoodBot Hardware case study

I experiment on myself a lot. The crazy diets, insane exercise regimens, mental strength practice, daily breathing — you name it. Many of these activities correlate directly with my mood.

What is mood?

It’s an impossible to precisely measure state of my mind on a given day. By impossible to measure I mean it’s only based on how I feel about that state. It’s never a definite 5/10 or 9/10 — ever.

So why would you want to measure something so imprecise?


That’s because, same as with sleep tracking, the individual values don’t matter, but assuming I roughly pick the right value each day, the trends and correlations is where it gets interesting.

Drinking coffee
One of my very last cups of specialty coffee. Oslo, Norway, July 2023.


A recent example is me quitting coffee (and all forms of caffeine) after being seriously reliant on it.

I felt terrible. Splitting headaches, feeling on the edge every day, irritable, annoying.

Now, I’ve done this a couple times before, but I never tracked my mood until this last time. So I had no idea how long — for me — the withdrawal symptoms from caffeine lasted.

Now I know. Exactly 6 excrutiating days.

Individual values don’t matter. The trends and correlations is where it gets interesting.

I used a pen and paper method of tracking my mood, by simply assinging a number to each day. But then, hiking a northern Norway mountain I had an idea and decided to quickly sketch it out.

Moodbot sketch in Svolvær, Norway
Sometimes good ideas come at high altitudes.

Current solutions

Pen and paper

Writing out a number manually is the cheapest and easiest solution. But it’s also pretty…