[chbot] Choc Fish Challenge #5

[m.beckett at amuri.net]

gUYS
Sorry hit some key combination and it went not even close to finished.

Our solution is (2km) :-

At the start end, hook up the battery to two wires,
Pair/join the remaining wires so you end up with 59 pairs and two 
singles.

Travel to the other end (1km) and identify the unpaired wires with a 
lamp that illuminates.
Label one end of the single combination as 1B and connect this to a 
wire, label this as 2A, then find the other pair, label as 2B.
Join 2B onto another wire, label as 3A, find the other pair and label 
as 3B....etc until 60B.

Travel to the start (2km) and connect the lamp to either the positive 
or negative and try all the pairs.
If you get the lamp to light, you can identify the battery end as 1A, 
the other battery connection as 1B.

Connect one end of the lamp to the 1A wire, and break one pair.
See how many pairs still light the the lamp, add 2 to this and you have 
identified the A leg of the pair, with the other of the pair being B 
leg.

If you work through the pairs, you will identify all 60 Pairs, with 
only 2km.


Cheers
Mark



On Mon, 5 Sep 2011 13:29:01 +1200, Synco Reynders wrote:
> Mark, Cass,
>   I tried Cass's solution (and improvised somewhat after step 1) and
> yet would almost say it'd work... my interpretation made an 
> assumption
> (battery polarity) and if it was wrong, you'd have a mind-messing job
> to re-number everything.
> Guess this will create a great discussion at the next robotics 
> meeting.
> /s
>
> On 5 September 2011 13:11, Mark Atherton <markaren1 at xtra.co.nz> 
> wrote:
>> Cass,
>>
>> I am not sure if your solution will work, but your reasoning is
>> thoroughly excellent.
>>
>> Well done.
>>
>> -Mark
>>
>> At 11:43 a.m. 5/09/2011, you wrote:
>>>I work out 2km:
>>>
>>>At the first end (end A) you connect all the wires together in 
>>> pairs,
>>>leaving 2 unpaired as single conductors, then you attach the 
>>> negative
>>>lead to one of the single wires and the positive to one of the 
>>> pairs.
>>>label the negative wire as 4 and the other unpaired wire as 1, you
>>>then walk to the other end (end B). (1km so far)
>>>
>>>Now at end B you try all the wires with the bulb untill you find the
>>>three live wires, you should be able to determine the positive end
>>>from the negative by there being two positive wires and only one
>>>negative, label the negative wire 4,
>>>
>>>Now connect the negative wire to one of the other wires that isn't
>>>positive, you should be able to find which wire its paired with at 
>>> end
>>>A by another wire in the group becoming negative, label the wire you
>>>connected to the negative as 5 and the lead the becomes negative as 
>>> 6
>>>
>>>The only wire this wont work for is the unpaired wire you labeled at
>>>the other end that wasn't negative. when you find this wire label it
>>>as 1 to match the other end and connect it to one of the positive
>>>wires, label the two positive wires, label the one connected to wire 
>>> 1
>>>as 2 and the other one as 3.
>>>
>>>Leaving each connection in place repeat that process of finding the
>>>pairs using the new negative lead until all of the wires are 
>>> connected
>>>in series except the three now positive leads (1, 2 and 3). label 
>>> each
>>>new wire you connect as one higher than the last newly found 
>>> negative
>>>wire you labeled and each new negative you find as one higher than
>>>that, such that the wires are connected in order, 4 is connected to 
>>> 5
>>>is connected to 6 is connected to 7 etc until all 120 are labeled at
>>>end B.
>>>
>>>Walk back to the end A (now having walked 2km)
>>>Now we can determine the order of the positive leads by 
>>> disconnecting
>>>2 and 3 from each other and the positive terminal then by connecting
>>>the positive terminal to each of them in turn until you find which 
>>> is
>>>connected to 1. label that wire as 2 and the other as 3. We can 
>>> forget
>>>about these three wires now.
>>>
>>>Now hooking up one side of the tester bulb straight to the positive
>>>terminal of the battery and leaving the negative terminal attached 
>>> to
>>>the original negative wire, 4, disconnect one pair at a time,
>>>reconnecting it before trying the next pair, until you find the pair
>>>that when you disconnect it, it leaves all the other pairs connected
>>>to the negative terminal. (you'll need some exposed conductor where
>>>you've bridged wires to test against). You can now label those two
>>>wires you have just disconnected, one will still be negative and the
>>>other wont, the one that isn't negative is wire 120, and the one 
>>> that
>>>is still negative is 119.
>>>
>>>Now leaving the newly labeled pair disconnected, repeat this process
>>>untill you've found the next pair that leaves the all the pairs 
>>> still
>>>connected to negative, disconnect that pair and label accordingly, 
>>> one
>>>less than the last pair, with the wire that is still connected to
>>>negative as the lower number of the two.
>>>
>>>Repeat the whole process untill you've labelled all of the wires.
>>
>>
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