Code
After wiring, please open the program in the code folder- Lesson 21 RC522 RFID
Module and press UPLOAD to upload the program. See Lesson 2 for details about
program uploading if there are any errors.
Before you can run this, make sure that you have installed the < rfid > library or re-
install it, if necessary. Otherwise, your code won't work.
For details about loading the library file, see Lesson 1.
#
de
fi
ne R
ST_
PIN
5
// Confi
g
u
r
abl
e,
s
ee
ty
pi
c
al pin la
y
out abo
ve
#
de
fi
ne
SS_
PIN
53
// Confi
g
u
r
able
,
s
ee
ty
pical pin layou
t
abo
ve
Th
e
lo
c
a
t
ions of S
PI
pin
v
a
ry
w
ith di
ffere
n
t
c
hips
,
and
y
ou ha
ve
t
o
m
a
ke
a
m
ino
r
m
odifi
c
ation of the func
t
ion.
Example picture
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