Character Map

The Segmented Characters

The F-91W has ten character positions, addressed by the Sensor Watch library from top left to bottom right:

• Positions 0 and 1: the Day of Week indicator on a stock F-91W.
• Positions 2 and 3: the Day of Month indicator on a stock F-91W.
• Positions 4-9: the clock (4-5 are hour, 6-7 minute, and 8-9 second). There is a colon available between positions 5 and 6.

Each character has up to 8 segments. The first seven are addressed as segments A-G. Positions 0 and 1 have an extra segment: 0 has a vertical bar in the center, and 1 has an extra segment at the top left. (disregard the decimal point in the above diagram).

Due to the creative way the Casio F-91W lays out its segments, not every position can display every character. In particular:

• Position 0 has an extra vertical bar, which means it can display several extra characters like M, W, T and the plus sign.
• Position 1 ties together the left and right sides of the digit (segments B-C and E-F). This means you cannot display letters like P that require one side segment on and another off.
• Position 2 is missing segment F, and segments A, D and G are tied together. This makes it only useful for displaying the numbers 1, 2 and 3, plus a few others.
• Positions 4 and 6 have segments A and D tied together, which limits the letters it can display, and means it needs a "lowercase" 7 to be able to display the digits 0 to 9.

This table covers each character in the Sensor Watch character set, and which positions can display each character.

Character	0	1	2	3	4	5	6	7	8	9	Notes
[space]	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	Clears any segments in the given position
!	–	–	–	–	–	–	–	–	–	–	Unused; currently blank
"	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
#	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅	This is actually the degree º or numero ° symbol
$	–	–	–	–	–	–	–	–	–	–	Unused; currently blank
%	–	–	–	–	–	–	–	–	–	–	Unused; currently blank
&	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅	This is a “lowercase” 7 for use in positions 4 and 6
'	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
(	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	Looks like the letter C, as well as [ and {
)	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	Looks like ] and }
*	–	–	–	–	–	–	–	–	–	–	Unused; currently blank
+	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌
,	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅
-	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅
.	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	Period appears as hyphen since there are no dots
/	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅
0	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅
1	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
2	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅
3	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅
4	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
5	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
6	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
7	✅	✅	❌	✅	⚠️	✅	⚠️	✅	✅	✅	String display method will swap in the “lowercase” 7 in positions 4 and 6
8	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅
9	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
:	–	–	–	–	–	–	–	–	–	–	A colon is available between positions 5 and 6
;	–	–	–	–	–	–	–	–	–	–
<	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅	Looks like lowercase c
=	✅	✅	❌	✅	❌	✅	❌	✅	✅	✅
>	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅
?	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅
@	✅	✅	✅	✅	✅	✅	✅	✅	✅	✅	This character turns on all segments
A	✅	✅	❌	✅	❌	✅	❌	✅	✅	✅
B	⚠️	⚠️	❌	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	Looks like number 8. Can be made more B-like in positions 0 and 1.
C	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅
D	⚠️	⚠️	❌	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	⚠️	Looks like number 0. Can be made more D-like in positions 0 and 1.
E	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅
F	✅	✅	❌	✅	❌	✅	❌	✅	✅	✅
G	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
H	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅
I	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌
J	✅	✅	❌	✅	❌	✅	❌	✅	✅	✅
K	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅	This one requires a little bit of imagination.
L	✅	✅	❌	✅	❌	✅	❌	✅	✅	✅
M	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌
N	✅	✅	❌	✅	❌	✅	❌	✅	✅	✅
O	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅
P	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅
Q	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅
R	❌	✅	❌	❌	❌	❌	❌	❌	❌	❌
S	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
T	✅	⚠️	❌	❌	❌	❌	❌	❌	❌	❌	For use in position 1, manually set segment (1, 12)
U	✅	✅	❌	✅	❌	✅	❌	✅	✅	✅	U and V are identical
V	✅	✅	❌	✅	❌	✅	❌	✅	✅	✅	U and V are identical
W	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌
X	✅	✅	❌	✅	❌	✅	❌	✅	✅	✅	This one requires a lot of imagination.
Y	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅
Z	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
[	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	Looks like the letter C, as well as ( and {
b	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
]	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	Looks like ) and }
^	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅
_	✅	✅	❌	✅	❌	✅	❌	✅	✅	✅
`	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅
a	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅
b	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅
c	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅
d	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅
e	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
f	✅	✅	❌	✅	❌	✅	❌	✅	✅	✅
g	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
h	✅	⚠️	❌	✅	✅	✅	✅	✅	✅	✅	By sheer coincidence, appears as uppercase H in position 1
i	✅	❌	✅	✅	✅	✅	✅	✅	✅	✅
j	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅	Lowercase j appears as superscript to work in more positions
k	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅	This one requires a little bit of imagination.
l	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅
m	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌
n	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
o	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅
p	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅
q	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅
r	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
s	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
t	✅	✅	❌	✅	❌	✅	❌	✅	✅	✅
u	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅	Lowercase u appears as superscript to work in more positions
v	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅	Lowercase v appears as superscript to work in more positions
w	✅	❌	❌	❌	❌	❌	❌	❌	❌	❌
x	✅	✅	❌	✅	❌	✅	❌	✅	✅	✅	This one requires a lot of imagination.
y	✅	❌	❌	✅	❌	✅	❌	✅	✅	✅
z	✅	❌	❌	✅	✅	✅	✅	✅	✅	✅
{	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	Looks like the letter C, as well as ( and [
|	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅
}	✅	✅	❌	✅	✅	✅	✅	✅	✅	✅	Looks like ) and ]
~	✅	✅	❌	✅	❌	✅	❌	✅	✅	✅	Top segment only