Intermediate Combinator Help for the Digital Display

[xtertristl]

Ok I’m writing this so that I can easily remember how to make a Digital Display in Factorio 0.12. This is done with combinators and plenty of basic information on them can be found here viewtopic.php?f=8&t=19825&start=40#p149604 and by watching the Hypnobunny video here https://www.youtube.com/watch?v=gPZU8_chH1U.

His guide takes you through the basics about how to build a digital display similar to the one I built here. Take the blueprint and have a look at it to see how it works try to build your own.

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They work very similar but I pulled together some information from other sources when trying to make this and wrung some changes. The 1st change that I made was to the display portion instead of using the 4x7 light grid with 7 sections, I decided to use a 3x5 grid with 13 sections. Additionally instead of calculating the number from left to right by dividing 10k, 1k, 100 and 10 I decided to calculate the number from right to left dividing it by 10 and then passing on the results. If you are happy with this level of a display then you can take my blueprint or many of the other peoples prints available and use them to your heart’s desire. But if you are wanting something more compact or just want to fully understand how to better make one of these I’m going to document my process this weekend of learning some intermediate techniques with them. If you want to see some truly advanced stuff have a peek at Piriform’s combinator computer MK2 which is still well beyond me.

--- Putting your number into individual variables ---

Digital Display1.jpg (110.05 KiB) Viewed 2613 times

Ok so there are some people who have made much smaller digital displays and if you’re interested I’ll try to explain how to do it. The 1st step into shrinking the number of combinators down from 33 for each digit is to look at the input. Currently when you want to measure the items in a box or network that number is in 1 variable. If I have a box with 100 plate the variable plate = 100 and I’d need 3 combinators to look at what is the last digit for each number. With the use of a constant combinator we can store each digit of the number in its own variable. I’ve included a blue print of what I’m talking about and kept things spread out so you can better see the connections.

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So if you look at the constant combinator there are 6 variables here. I’ve used A-E because I they are easy to distinguish but you can use anything, the variables are assigned a number for the 5 digits we can handle one for each place (A=1, B=10, C=100, D=1000, E=10000). If you want to handle numbers bigger than 99k then you’ll have to give up some details and work in thousands because if you try to add a 6th digit you get into numbers that are too big and will overflow our calculations. I usually work with my numbers in thousands anyways so that really gives me up to 99 million on a 5 digit display. From the top we multiply each input by the 5 variables by the input. If you hang your mouse over the combinator all the input signals will be visible on the right side of your screen. With an input of 1234 the variables currently would be A=1234, B=12340, C=123400, D=1234000, E=12340000 ignore blue from this point on we are going to split it up into its digits. We then feed these variables into two more combinators to take advantage of the rounding in Factorio. The first one we divide by 10k to get the number less the last digit respectively A=0 B=1, C=12, D=123, E=1234. Note that A won’t be output as Factorio doesn’t output variables that equal 0. In the 2nd one which you can see is on a separate circuit network we divide by 100k and then multiply by -10 leaving us with A=0, B=0, C=-10, D=-120, E=-1230. We then combine them back together and A=0, B=1, C=2, D=3, E=4. Tada we have moved all the digits to variables. But you might be asking me I’m looking at your blueprint and the output I’m getting from the combinator is B=2, C=3, D=4, E=5 and what is that decider combinator that is there. Good Question the Decider combinator is there to check and see if the digit is present after being divided by 10k and increase each variable by 1 so that a 0 becomes 1 if it is present and will be displayed because if it isn’t present it’s at the beginning of the number then we can blank out that display.


&TLDR look at the highlighted combinator and you’ll see that each digit has been separated into a variable +1 to the digit.


--- Storing the Display instructions ---

Digital Display2.jpg (245.47 KiB) Viewed 2613 times

Ok so if you’re following along you should have a combinator with your number split into its digits and ready to be displayed. Next we need to program the display. In the basic version of this we had the display split into 13 sections and Hypnobunny’s had 7 different section with a little trickery I figured out how to split it up into 11 sections. But first how to store the instructions we need 1 combinator to hold the instructions (ROM) and one to program them into the ROM. So grab my next blueprint and build it to the left of your number calculator

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The bottom Combinator is where we will store all the instructions on which lights to light up for which number, this is our ROM. The combinator above it feeds the instructions into the ROM from the Constant combinators above. The nice thing about this setup is once the ROM is programmed you can remove the programming combinators. In my example there are constant combinators for each digit but you don’t need to do this you could put up to 15 instructions in one constant combinator. To program the ROM connect a red wire from the decider combinator to the arithmetic combinator as shown above. It doesn’t matter which way you connect them. After that you can remove the decider combinator and constant combinators from this section and the arithmetic combinator should remember all the information but keep them until you’ve connected the display.

&TLDR Connect the two combinators with a red wire

--- The Display ---

Digital Display3.jpg (527.61 KiB) Viewed 2613 times

Ok the last part of this guide is the display this is where you’ll see all your fine work come to fruition. Below is the blueprint lets add it just under the other two parts. Don’t worry if you can’t fit in the sub stations just make sure the bottom row of lights is powered by the substations from the number splitter and the ROM section.

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Let’s talk about the 15 lights in each number. They are broken into 11 sections from 100 – 1100 by hundreds we can pair some of the sections together because for any number that uses 1 of them all of them will be used and any section that doesn’t use 1 of them none of them will be used they are the 100, 400, and 500 sections (I didn’t number them found and copied them) 100 is top left and right corners, 400 is the middle spots missing from the number 8, and 500 is the bottom right corner and the left and right spot on the 3rd row. Have a look at the image to see the layout.

To light up a number 1 we want to light up sections 200, 400, 700, and 900 sections. Hopefully you remember that for a number 1 in our number calculations we output a number 2 so to light up the 4 sections used for a number 1 we need to add 2 to 198, 398, 798, and 898. If you go up to the area where we were programming the ROM the 2nd one on the right from the top contains the power poles variables with the values set at 198, 398, 798, and 898 this is where we told the ROM how to display a number 1. If you look at the combinator next the each digit you’ll see where we do our final calculation to display the number. We take each variable and add the value of A-E to it. Remember the variables A-E hold each of the digits of our inputs A holds the 10k place to E holding the ones place.

&TLDR put in the display below the other two sections.

--- Final Connections ---

If you’ve been following along everything should be ready connect a green wire from the output on the ROM combinator and the output on the number Combinator to the input any combinator in the display. Voila you should have a working display. Here’s a blueprint with everything connected, Remember you need to program the ROM before it will work if you just used this blueprint.

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&TLDR Here is my compact digital display. Don’t forget to program the ROM.

Digital Display4.jpg (503.7 KiB) Viewed 2613 times

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I hope this helps people who want to make a digital display for 0.13 of course there will be changes but hopefully the knowledge in this will help you build even better displays with the tools we have been given.

[XKnight]

Small mistakes:

Picture

1.png (643.26 KiB) Viewed 2514 times

1) In current version, yellow combinator doesn't perform any usefull job and can be removed.
2) Red signal will be delayed by 2 ticks and Blue signal will be delayed by 1 tick. This desync will produce strange results on the display when input value is changing dynamically.

I suppose you misconnect this combinator.

[xtertristl]

Thanks Xknight for your feedback I tried to link your post but factorio wouldn't let me. ** was able to edit a link into your post that helped me.

Wow missed that I was crossing circuit lines and missed that yup. you can remove that last combinator. Thanks for the advice

Any advice on how to fix the 1tick out of sync problem would be great. My post was meant to aid people who were trying to understand how to do this on their own. Yours and other digital displays helped me learn how to do this but it took me so long learn by rotating combinators I felt this guide was needed.