There are also through-hole linear opto isolators available which you use with an opamp circuit to communicate analog voltages in an isolated manner. For instance http://www.ece.umd.edu/~neil/micropower/power/solarcell/optocoupler300.pdf
There are also through-hole linear opto isolators available which you use with an opamp circuit to communicate analog voltages in an isolated manner. For instance http://www.ece.umd.edu/~neil/micropower/power/solarcell/optocoupler300.pdf