The intention was to build the most universal soldering controller I can think of. It can drive any low voltage (upto 24V) iron with thermocouple or resistive sensor, in series with the heater, or separate. Here is a short list of features: – power: 9-28V, AC or DC – 2 separate heater control channels – 2 independent sensor inputs – current source on any sensor input 3uA – 12mA, wuth 2 bands (x1, x16) and 256 steps per band – flexible differential amplifier input selection – amplifier gain from 0 to 750 in 256 steps – negative offset selection in 1024 steps – resistive instrument identification (upto 625 different instruments can be identified by 2 resistors on the connector) – polynomial floating point voltage/resistance to temperature calculation – wave shaping to filter out the inductive peaks from series sensor signal – PID control with power limit – isolated USB port for firmware updates and live data – 128×64 OLED display with rich user interface. [ ]