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Just wondered what the "shift register" chip's function is in the design of the Heatermeter? Does it have anything to do with the functioning of the LED's and alarm buzzer?

Just finished my first board--rapsberry pi B, thermocouple pit, ambient sensor probe 3. Boots up fine, everything works minus the following: 1. LED's won't activate even after tinkering with the software settings to try and nudge them 2. Lid Open function doesn't seem to work--nothing happens...

Just finished assembling my first board, but have a part left over (thermistor r2.5) for ambient temperature reporting. Where does it go?