Closed Juul closed 6 years ago
Here's a KiCAD project with an RFM95(W) breakout. It's not exactly what we need (only two-layer, no impedance matching, wrong antenna connector), but we can copy the PCB footprint from this project.
Fitz and nanomonkey finalized the design and ordered these on October 19th with express shipping.
Version 2 has been ordered
We need a breakout board for our breakout board!
We're using the Semtech SX1276 for LoRa, but using it directly requires a bunch of support components so we're instead using a module like:
They accomplish the same thing, are similarly priced and use the same footprint but the pinouts are unfortunately different. The RFM95 is the most popular module but the DORJI is a bit cheaper.
These modules have no antenna connector so we need to break them out further. Breaking out the antenna pins to an antenna connector requires impedance matching. Here's a really nice talk on doing impedance matching the easy way.
@nanomonkey is working on a breakout board that will include:
We will order a bunch of them from Seeed Fusion as soon as the design is ready.