12 Node Cluster Wardriving Container V1 for Seeed Studio XIAO
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A container for 12 Seeed Studio XIAO MCUs, with external SMA antenna mounts and a battery bank.
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Improved V2 with 6-node and 12-node versions available now.
This is a container which holds twelve Seeed Studio XIAO microcontrollers, each with its own external antenna, as well as a battery. I use it with XIAO ESP32-C5s for dual-band cluster wardriving.
The container's outer dimensions are 181.5 x 95 x 60 mm, not including I/O.
The base and lid assemble using six M3x6 screws, which thread from below into M3x5 heat-set inserts mounted in the lid.
My container was printed in transparent PETG on a Prusa MK4S. Transparent filament allows the indicator LEDs on the XIAOs and battery bank to be seen from the outside. PLA is not recommended due to its potential for warping when outside in the sun or in a hot car - use PETG or another filament with higher heat resistance.
The base should be printed with the bottom down, and the lid with the top down. I recommend using supports for the screw holes on the base. The lid does not require supports.
The XIAOs are mounted on the underside of the lid with VHB tape, and are each connected to an external Wi-Fi antenna terminal using U.FL to SMA adapters. Make sure to use the correct antenna adapters - antennas may be SMA (pin on antenna) or RP-SMA (pin on terminal), and each requires its own type of terminal.
The XIAOs are staggered and spaced to allow USB-C connectors with up to an 11mm housing. While it is possible to power all the XIAOs with a single USB cable by wiring their power pins together, I prefer to power each XIAO with its own USB connector so that assembly and MCU replacement are easier.
The base was designed to contain two 1-to-6 USB-C splitter cables and an INIU P41L battery bank. Holes are included on one end of the base for both a 22mm⌀ USB-C connector to charge the battery bank, and a 20mm⌀ toggle switch, which is wired into the USB 5V line to act as a power switch.
I discovered in testing that the P41L seems to have some sort of auto-shutoff feature, so after being off for a while it will go to sleep and the toggle switch will not awaken it. Since I already have the battery bank and I don't want to modify it, I added small holes in the base's middle recesses, through which I can reach the battery bank's built-in power button and awaken it manually.
An alternate version of the base is included without the external holes to make it easier to modify for different configurations.
Designed with Onshape.