I purchased a RGI-20DX geophone a few years back with the intention of building the earthquake sensor. Luckily, I purchased a bunch of Pi’s before they no longer were available at a reasonable price. Here I am 74 years old now and finally getting around to working on this project. I want to purchase a shake RS1D board, but I have not been able to locate one that I can purchase. All my old links are “404” of course.
Does anyone know of a location that has just the RS1D board available for purchase at a reasonable price?