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All OpenTracker models use the same firmware and configuration program, but some hardware features differ. See the latest OT1 manual for software/firmware documentation.
Data SheetsMC68HC908KX8 microcontroller
HC08 CPU reference manual
NJM78L05 voltage regulator
LM335 temperature sensor
Revisions (OT1)To date, there have been four major PCB revisions, not counting various prototypes.
Revision 1 - Only a handful of these boards were produced. These boards did not have voltage measurement capability.