Measuring a Constant Pressure
Yesterday I decided to make a board that senses when a phone is sitting on top of it.
I was thinking along the lines of load cells and piezoelectric sensors, since I haven't used the latter before. However, I realized piezos don't measure a constant pressure. The voltage generated by a static pressure eventually fades to 0 as the charge dissipates. Good thing to know!
A piezo would only detect me initially placing the phone down, but wouldn't know if it was still sitting there.
I started to consider load cells, but didn't want to relive the strain gauge nightmare. They're bulky and overkill too...
Wait, I can just think bigger.
My goal: Detect presence of a phone.
This does not mean I have to stick to measuring pressure!
When I place a phone down, not only does it exert pressure, but it also blocks the light underneath! Yesterday, I reminded myself of the existence of the humble photocell.
Quarantine Update 1
I finally hauled my rework station back home! Forgot my retainer, though. Prioritization will be a recurring theme today.
In light of this quarantine, now's a good time to work on some side projects!
For one, I have trouble writing down all my ideas and prioritizing the project I want to do first.
A friend introduced me to Roam, a pretty nice note-taking tool, but I might just stick with pen and paper. It'll never lag.
We brainstormed and found it'd be neat to have a "Side Project Prioritization Tool" that assigned scores to potential project ideas based on:
Coming soon: The Meta-Project-Project, another project that shouldn't exist. Let's see if it passes its own criteria...