Factorio Forums

Identifying needed (independent) inputs

To distribute the fluid we start by setting up the tanks and pumps.
The current Oil inventory Is measured in Tank A
Pump 1+2 splits it into Tank B+C
Pump 3+4 distributes to the consumers.

The measured contents of tanks A to C is a real number, so it needs an input conditioner to render a single status bit for the contents.

This can be accomplished using a Hysteresis response
While input remains below maX the output is "0" - after triggering - the output remains "1" until the value drops below miN.

This can be a quite demanding process, to assign each combination of inputs to the output needed.

Besides the 2 threshold inputs a state bit "S" is input, and next state "S1" is fed back to the S-bit (state-bit) making this an asynchroneous combinatorial state machine (aka. More-machine) with potential race conditions if inputs change sumultaneously. In this case we seem safe since X and N can not both change, but the delay in the logic could cause race between the S-bit and the inputs. Very short transients sent to the pump control will not be a hazard - just a slight error in dosis.

In this case it is fairly straight forward. S stays at 0 until X=1 then stays 1 until N=1. Both N=1 and X=1 is not possible and don't-cares "X" can be used. When S changes state, then the V-bit can be dont-care.

Operations -> Minimize:


Result

Operation -> Map to Gates

Result

Here the "S"-bit indicate on of two states: collect (S=0) and distribute (S=1)
Going through each combination would be tedious.

Minimized

S1 = B C + S B + S C;
P1 = S' B' + S A C;
P2 = S' C' + S A B ;
P3 = S A C + S B ;
P4 = S A B + S C;

By using boolean algebra a manual gate mapping can be made:

Recognizing common terms as internal variables

V1 = S A;
V2 = S B;
V3 = S C;
V4 = B C;
V5 = V1 C;
V6 = V1 B;
V7 = S' B';
V8 = S' C';

then realizing the sums

S1 = V4 + V2 + V3;
P1 = V7 + V5;
P2 = V8 + V6;
P3 = V5 + V2;
P4 = V6 + V3;

3 inverters and 12 gates can implement these equations.
(Limited number of attachments - Image missing)



Minimized + mapped.
(Limited number of attachments - Image missing)




The automatic mapping beat me by 2 components in the count, but the actual build is based on the manual gate map.
(Limited number of attachments - Image missing)

Logic state machine

(Limited number of attachments - Image missing)






The combinator condition "any" can OR as many signals as needed (The red wire network with V2 + V3 + V4 are using this as wired OR in S1)

(Limited number of attachments - Image missing)





A single green network distributes all the internal variables (V1 - V8) with lamps as status/debug output.
(Limited number of attachments - Image missing)



All the pump control bits are simple two input OR gates



... to be elaborated in colaboration?