Back in 2017, I laser-cut a menorah out of poplar. When the family showed up for Hanukkah, I mentioned my “laser menorah.” My nephew’s eyes lit up with excitement, but I could see his disappointment upon presentation of the actual product.
Subsequently, I’ve been building something closer to what he probably envisioned in the first place.
I’m slow at building things, and have lots of other commitments taking up time. I spend maybe an hour or two a week on the project, and tend to forget a lot of important details between sessions. There is a whole lot of learning and re-learning. However, I thought that documenting the various processes here would be good for me (my external memory), and may be of interest to others.
The first step of any project, of course, is to give it a good name and maybe a logo. Since it’s a laser menorah, I’m calling it the Maccabeam™, and my initial version of the logo looks like this:
So there are a lot of things to talk about here. I’ll post a lot of circuit design ideas, physical design ideas, and details on the software that drives it. I’ll also probably post some ambivalent thoughts on the whole holiday of Hanukkah1. But for now, I’ll start with the list the requirements I’ve been using for the project:
- Instead of candles, I’ll be using lasers!
- The lasers will probably be illuminating vials of olive oil rather than shining on the ceiling.
- There will be more lights, too. Color LEDs! NeoPixels!
- The whole thing will be driven by an embedded controller I can program. Since I like the Teensy and Paul & Robin seem like the kind of people I want to support, I’ll go with a Teensy LC. Update: I have ended up using a Teensy 3.2 because I needed more memory.
- Since I have a microcontroller, it should take advantage of the smarts, and not just rely on an on/off switch.
- Hey, if it’s gonna be smart, it should use a GPS receiver to figure out the location and date, and automatically run itself on Hanukkah.
- It will need some kind of display so you can tell what it’s doing, what time it is, how long until Hanukkah, etc.
- It’ll be cool if it could play some music too.
- OK, maybe I don’t want an on/off switch, but I do need a switch to trigger a simulation mode. That way, I can show it off to people at any time of year.
- [update 13 May 2019] Oh, I forgot an important one. The Maccabeam™ wants to be stand-alone. It doesn’t want any dependencies on the Interet, wireless networks, or the like. It should only depend on a source of electricity and a constellation of 20-some-odd highly sophisticated satellites and their ground support network.
So with that set of requirements, I got started. I hope to write something here about each of those requirements as I complete the build.
Update 1: The Flickering Candles.
Update 2: Some Physical Structure
Update 3: When Exactly is Hanukkah?
Update 4: A Typical Code Problem
Update 5: Oil and Lasers
Update 6: Final Product Gallery
1 I mean, it’s celebrating the victory of a family of intolerant religious fanatics over both their foreign imperial enemies and their more moderate coreligionists. Their victory established the shaky Hasmonean dynasty whose infighting and collapse resulted in Herod’s rise to power in the region, etc.
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