It looks like the breakout board has some solder pads on it that you can bridge to change the I2C address. You should be able to use 3 of the matrices on a single Arduino.
There are also some ICs that allow you to use multiple I2C busses and switch between them, but I don't remember what they are called off the top of my head.
Very nice! The aluminum really adds a touch of class.
I tried my hand at a similar clock but using veneer instead of drilling holes. It didn't go so well using natural woods (oak, walnut, and cherry mostly -- I like the darker stuff). I hand sanded thin strips off the bandsaw thinner than a sheet of paper, but they still didn't allow much light through (from a 7-segment LED display) and/or were blotchy.
Great project and video. Also respect the inclusion of a Paul Sellers video! You earned a follow on Hackster and a sub on YouTube. Looks like you've got plenty of content to keep me busy watching for a while. Keep up the good work!
Nice! I don't know why I never thought of that use before. It's a great little screen and microcontroller but a bit limited by lack of SPI and the ability to easily communicate with the outside world. Might be fun to add different dice types (d4, d20, etc) for other games. I wonder if the MicroView can run off of a joule thief to make it more portable with only one battery. Thanks for sharing and giving me inspiration!
Your best bet for strands like those will be eBay. Just search for "ws2811 string 5v" and limit the search to US only--that will get you the fastest shipping instead of waiting for the slow boat from China. I've used those strands for a few word clocks as well as on my front porch. They're so versatile!
Be careful with sensor placement relative to the microcontrollers. Beefier ones with wireless chipsets like the ESP8266 and Particle Photon can generate quite a bit of heat, even enough to throw off sensors on the same breadboard. For warmer micros, you'll want to disconnect/disable wifi or put it into deep sleep. Deep sleep on the ESP8266 can be tricky depending on the manufacturer of the breakout board. Sometimes a jumper and/or extra resistor will need to be added to allow it to sleep. And, from my experience, the Adafruit HUZZAH version cannot reliably go into deep sleep and wake back up based on a timer. Sometimes it will stop waking up after 5 minutes (of 60-second sleep intervals) or it can run for 16+ hours before going completely comatose.
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