Factorio Forums

Instead of returning a signal with a count of 0, could get_merged_signals() instead leave the signal out of the list, and if there aren't any non-zero signals, just return nil? My idea to detect changes is to have the iopoint linked to a lamp on a hidden surface, and the lamp would have a constant combinator connected to it with the other color of wire. Whenever a signal comes in, the mod will detect when get_merged_signals !=nil. The constant combinator would then negate the signal at the lamp so that the merged signal is once again nil.

If you're looking for an (relatively) easy way to detect curcuit events look at what this mod does: https://mods.factorio.com/mod/glutenfre ... ork-events

Implemented for 2.0: get_signals [due to rename] will not return signals with value of 0.