|Experimental opto-isolator board on Data Bus|
Opto-isolators, for those that don't know, are an IR LED and IR Phototransistor (or similar) housed in a single package, in this case a 4-DIP. They appear to provide good noise isolation among other benefits.
The inputs and outputs are on opposite sides of the board with nothing connecting them. I added filtering caps to further filter the power supply.
|Simple opto-isolator circuit|
|'a' at 38400 bps|
As I write this, the uBlox is tracking 9 satellites in my basement with a horizontal dilution of precision (HDOP) of 1.0, that is, really good. The absolute accuracy is several meters. Not bad for sitting in the basement.