We all have to start somewhere. Like math - you have to start with addition and subtraction, before you can do integrals, Fourier Series, etc.
So what are you learning about? Or what’s on your project list that is begging for free time?
- Shimmering Christmas tree. A flat-pack “Christmas card” for cousin’s kids, and if they survive it, my Cub Scout Pack. An ATtiny85 with its 6 I/O pins drives 12 channels of LEDs and goes into energy saving mode if the room is quiet. Uses polarized and color-coded connectors so that anyone 7+ years or older can assemble into a mesmerizing tree, without reading any instructions. BOM at $10/unit (I could shave it but then the µC would not be as easily repurposed for future projects I might send then.) Runs on 3 AA batteries, or USB. I would like to learn modern circuit board design and use SMT components.
- Ever-glow signs. UV LEDs refresh glow paint, so I can light up a sign at night for months on a single charge. Would like to learn low-power modes on the ATtiny85, how to protect equipment from weather and UV damage, and maybe make something that looks nice too. Cheap as nails.
- A bathroom fan switch for a relative. Change its programming by modifying its Micropython code from a web page. While I know there are similar devices on the market that might be re-flashed, they do not include 2kV separation, MOVs, and other things that I feel are necessary safety items. Would like to laugh at how ridiculously over-featured it is for a fan switch, but rest easy it would never cause a house fire.
Completed or Nearly Completed
- Alarm integration for DSC alarms to send SMS notifications via Twilio.
- A mini NAS. 20TB (30TB raw, ZRAID2) which draws 32 watts (including the Low Volt UPS which lasts several hours). 4.5" x 5" x 10", imperceptibly quiet. LV UPS is 2.5" x 4.5" x 6".
- Low Volt UPSes. Although Dan Julio Designs really did all the work. His board is functional, reliable, efficient, silent, and beautiful too. I plan to add a small board with a power MOSFET for low voltage cutoff on the 12V output, so my relatives don’t have to connect an SLA charger because the battery drained below the detection point.