![]() ![]() ![]() It's not just the firmware, you also need to know how to connect a micro safely and cheaply to the incoming phone line - and the rat_ring has a 40 page tutorial describing the interfacing techniques. The whole lot is documented on the Yahoo Group "rat_ring" Over the course of the project (and several years) I got the following building blocks to work: I wanted a cheap way of getting trivial data from remote sensors, and before Pachube, and "always on" broadband, the standard PSTN phone line seemed an attractive possibility. A few years ago I wrote a whole lot of telecom tone generation and detection stuff in PIC assembler, with the aim of getting 2 PICs to talk over the phoneline using a software generated V23 modem. ![]()
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