On Friday, August 30, 2019 at 6:21:26 PM UTC+2, N_Cook wrote:
A collection of LCD display readings and their SPI codings with the
repeated sections removed, leaving just 4 "rows" of 3 hex characters
(intervening repeated strings removed for clarity, described earlier in
this thread, would come into play for hundreds /thousands/other rows in
the diplay perhaps).
The first rank all even(eg 2,6,C,8 in the 1.014m reading is the mm
(thousandths) ,0 to 9
The second rank (eg C,D,5,C in the 1.014) is the cm (combined tenths and
hundredths) , 00 to 99
The third rank (eg 0,1,1,0 in the 1.014 or 7,D,7,5 in the 30.190 ) is
the combined units and tens
so 0, 1,2,3 ... 99
going by the pairings of "19" in 30.190 and 2.197, both coded to 9,5,7,3
and "20" in 8.206 and 9.206 , both coded to D,B,D,7
Perhaps someone can see octal coding or something , to avoid determining
two sets of 100 pairings, but so far I've not managed to reduce the
required look-up conversions required.

1.014
2,C,0,
6,D,1,
C,5,1,
8,C,0,

1.036
6,D,0,
E,D,1,
8,7,1,
C,D,0,

2.197
2,9,3,
6,5,2,
4,7,1
4,3,1,


4.235
6,D,0
6,9,3,
8,F,3,
C,5,0

5.265
6,D,1,
6,B,3,
8,E,2,
C,7,1,

6.243
6,C,3,
6,9,3,
C,F,2,
4,6,1,

7.112
6,8,0
A,5,1
C,5,1
4,0,1,


8.206
6,D,3,
E,B,3,
8,D,3,
C,7,1,

9.206
6,D,1,
E,B,3,
8,D,3,
C,7,1


10.217
2,C,3,
6,9,5,
4,D,7,
4,4,1,

16.388
6,D,3,
E,7,7,
C,F,6,
C,7,1,

22.136
6,9,F,
E,5,A,
8,7,5,
C,1,5,

26.766
6,9,F,
E,7,B,
8,6,6,
C,7,5,


30.190
6,9,7,
E,5,D,
4,7,7,
C,3,5,

30.191
2,9,7,
6,5,D,
4,7,7,
0,3,5,

30.192
6,9,7,
A,5,D,
C,7,7,
4,3,5,

30.195
6,9,7,
6,5,D,
8,7,7,
C,3,5,

30.196
6,9,7,
E,5,D,
8,7,7,
C,3,5,

The 30.19 set was setting up on a tripod and repeated grabbing codings
until I got a repeat reading. This was at dusk, after a sunny day, but
even so over 30m , for 6 readings involving switching off and on again ,
just a spread of 6mm and no guarantee my touching the buttons did not
upset the tripod a bit.
--
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