Clock acting strange and button not working

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7 months 3 weeks ago - 7 months 3 weeks ago #8033 by pommesgabel93
Hello fellow nixie-fans,

I have a problem with my nixie-clock. It does not react to button presses and also the clock does some things I don't understand.
More precisely: The digits do not switch in the right order, instead of 0123456789 they go 01076789. Before having this issue I did not use the clock for half a year or so. The problem I had before was the clock running too slow but keeping the digits in the right order, the button was also working. As you can see the problem I have now is way worse. I am not sure what produced this problem, maybe I broke something trying to resolder some components? I am not sure where to start looking for the problem now. However, I already checked the wiring and the connection of the button and it has connection to the pins it is supposed to, according to the schematic. I will add a video to show the problem. Any help on this problem would be greatly appreciated.

thanks in advance,
Janosch

Last Edit: 7 months 3 weeks ago by pommesgabel93.

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7 months 3 weeks ago - 7 months 3 weeks ago #8035 by Ian
Hi Janosch

it looks like a bit is missing in the data from the controller to the K155. Because of the wiring there is a lookup table in the code that converts from the raw binary to a mapped binary.
byte decodeDigit[16] = {2,3,7,6,4,5,1,0,9,8,10,10,10,10,10,10};

this means that the digits you see are mapped like this
number -> normal binary -> mapped number -> mapped binary
"0" -> 0000 -> "2" -> 0010
"1" -> 0001 -> "3" -> 0011
"2" -> 0010 -> "7" -> 0111
"3" -> 0011 -> "6" -> 0110
"4" -> 0100 -> "4" -> 0100
"5" -> 0101 -> "5" -> 0101
"6" -> 0110 -> "1" -> 0001
"7" -> 0111 -> "0" -> 0000
"8" -> 1000 -> "9" -> 1001
"9" -> 1001 -> "8" -> 1000

There are only 8 numbers in the numbers you observe. Can you tell me the exact numbers you expect and those you observe, and then we should be able to see the bit(s) that are stuck.
Last Edit: 7 months 3 weeks ago by Ian.

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6 months 3 weeks ago #8071 by pommesgabel93
Hey Ian,

as you can see I have a video uploaded which shows the behavior of the clock. After the eight digits I told you about the roll-back animation starts and it starts with the first digit (0) again.

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6 months 1 week ago #8098 by Ian
Hmmm, please try removing and re-seating the controller and the K155ID1. I wonder if there has been some tarnishing on the pins...

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