Factor-I/O adds a number of sensors meant to be used as inputs to circuit control logic, to enable kinds and manners of automation not normally possible.
Sensor List
The sensors added by Factor-I/O are:
Empty Slot Counter
Fluid Temperature Sensor
Research Progress Monitor
Daytime Sensor (detects exact time of day)
Timer (pulses at a fixed rate)
Nearby enemy detector (counts nearby enemies)
Power production monitor
Power consumption monitor
Power satisfaction monitor
Logistic bot counter - counts bots available to the entire network
Construction bot counter - counts bots available to the entire network
Global train status monitor - reports total count of moving, parked, waiting, and lost trains
Train fill sensor - reports how many connected train stops have empty/full trains
Actuators
There is also an actuator in the mod, ie a sensor that actually changes something. This is the inserter filter actuator, which will change inserter filters as it is directed to do so.
Source Code
The source code for Factor-I/O can be found here:GitHub
