The RPi-Basic Spring adapter allows for easy connectivity between a Raspberry PI and any of the LooUQ Circuit River Stream devices, including our LTEm1 Stream modem. The adapter has a voltage regulator to supply the modem with power derived from the Raspberry PI's 5-volt supply and signal connectivity. For applications where the USB port is utilized (Linux) as the communications path between the R-PI and the modem, the IRQ and SPI-CS traces can be easily cut to prevent unexpected interactions.
The RPi-Basis form-factor matching for the Raspberry PI Foundation HAT specification, but since we have not implemented the GPIO automatic mapping we don't call it a HAT. It is available with either stacking or non-stacking 40-pin I/O header (2nd photo, with LTEm1 attached, shows stacking header).
Prototype pictured here. Lab testing has been successful, now undergoing field testing with customers. Available in late summer 2019.
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LooUQ Circuit River Springs are open-hardware and all supporting software/drivers are licensed as open-source. Please visit our GitHub to see our Eagle-CAD design files and our collection of open-source software repositories.