Thanks - I am using v2.05 firmware (Sep 2019 vintage PuckJS). The onboard IR LED transmits in the ~940nm (same as mine) so it's odd that the same receiver does not see it.
I have now inverted the roles of the two PuckJS. Again the same phenomenon (second Puck sees the IR signal from my own LED but not Puck's). It is unlikely that the transmitter on both Pucks are faulty. But I don't have anything else to test them with. Any idea?
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