That pin is super tiny! , not sure how to attach to it!
Just in case the polarity is wrong, you can use NewSoftSerial library by Mike Hart. You can specify what polarity to use on the TTL signal.
With the GPS connected your probes probably do not generate enough electrical noise to make garbage come through the serial connection.
Quote from: liudr on Sep 28, 2011, 07:22 pmJust in case the polarity is wrong, you can use NewSoftSerial library by Mike Hart. You can specify what polarity to use on the TTL signal. Is there a write-up about doing that? I have looked through the library and it wasn't clear to me.
Signal Inversion"Normal" TTL serial signaling defines a start bit as a transition from "high" to "low" logic. Logical 1 is "high", 0 is "low". But some serial devices turn this logic upside down, using what we call "inverted signaling". As of version 10, NewSoftSerial supports these devices natively with a third parameter in the constructor.NewSoftSerial myInvertedConn(7, 5, true); // this device uses inverted signalingNewSoftSerial myGPS(3, 2); // this one doesn't