GPS Shield
The Amicus GPS shield contains a multi channel GPS receiver, as well as a 16k byte (128 kbit) serial (I2C) eeprom, and a 3 Volt, 12mm battery socket in order to maintain the receiver's built-in RTC (Real Time Clock).
An SMA socket allows attachment of the GPS receiver's aerial.
More detail is available on the Amicus website
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Re: Pull down button on Port B
keep in mind AN552 refers to ancient technology that has no esd protection of any kind [like esd diodes], with contemporary chips i would expect no trouble either.
richard - 23rd January 2026, 22:43