Tim SavageBetween the datasheet and probing with a continuity indicator pinout is quickly found.
There are a few pins free that could be used for other things. Maybe 27/28 could have a rotary encoder added.
Pinout
A project log for Alternate Firmware for FG-100 DDS Function Gen
Reverse engineer the FG-100 pinout and develop alternate firmware that improves some of the shortcomings of the default firmware.
Discussions
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I think pin 23 is actually used to measure the input voltage for a "low battery" notification. My firmware does not have this feature built in.
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