Schematics

1 2 3 4
A
B
C
D
4321
D
C
B
A
C3
NC
C4
20P
C6
105 P
C1
0.5P
C2
3.9P
C5
20P
Y1
24MHZ
LED1
R/LED
R2
100 R
R1
330 R
SW 1
SW SPDT
S3
SW -PB
3.0V
BAT
ANTENNA
1
2
3
4
5
6
7
8
9
10
11
12 13
14
15
16
17
18
19
20
21
22
23
24
VDD
VDD
S4
SW -PB
S2
SW -PB
S1
SW -PB
SPI SI
SPI CS
SPI SCK
SPI SO
1
2
3
4 5
6
7
8
SPI CS
SPI SO
SPI SCK
SPI SI
VDD
2.4G TX
U1
C7
104 P
TX/CP2303 -SOP2 4
SPI
U2