This last week has seen a lot of time on mechanical CAD and 3D printing to try and squeeze the MQTT subscriber system into a wearable package.
I called it the ARM Car because it looks like a car and it is a TI ARM chip to be worm on an arm.
Here is a picture of the ARM Car driving down the information highway:
Starting with the high stack of circuit boards - it is non-trivial to figure out how to make it wearable:
The package is assembled from 4 main plastic sections, a wrist bracket, a base, a cover and a bezel:
Here is a picture of the parts (the bracket is already screwed to the base):
Note the battery also has a 3D printed bracket and the rods for the strap are also 3D printed.
Here is a picture of the system in operation:
Here is another angle showing the height and the fit on my arm:
The system was always going to be fairly big, but it turned out to be a nice robust package that can be securely and comfortably strapped to an arm and is super easy to use. The only control needed is the power button on the battery, although the 3 switches on the Launchpad are all still accessible.
It isn't too visible in these photos, but the various LEDs inside really illuminate the plastic, creating a nice effect without being annoyingly bright.
I have printed some parts for the other 3 armbands (radiation sensor, electromagnetic sensor and chemical sensor), but am still waiting for some parts to show up before they can be finalized. I have a couple of other RF sensors that I may blog about too, but I don't think I will be able to fit them on my arm. When the 4 armbands are all complete I will take some video.
Hopefully I will get to a discussion of RF hazards in my next blog.
All links to blogs related to this project can be found in the first blog here:
Safe and Sound - Invisible Hazardous Environmental Factors Monitoring System - blog 1
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