I made the connections, breadboard and soldered to Arduino Wireless SD shield, as per http://docs.macetech.com/doku.php/chronodot_v2.0
to an arduino UNO R3 and ran the sketch from same webpage.
I added Serial.println("setup"); and Serial.println("loop");
appropriately, since website version produces no output on failure.
setup and loop execute as expected, Wire.available() never returns true
I had tested pins A4 and A5, as analog pins, with a joystick.
Reset, removed power, removed batteries, with and without pullup
resistors, etc, no change.
Thanks in advance,