U7
U3
U2
U6
R5
Resistance
15KΩ
R1
Resistance
10KΩ
High Voltage
Microcontroller
R7
Resistance
15KΩ
Shift register
R4
Resistance
15KΩ
Power
RTC
R3
Resistance
10KΩ
Buttons
R2
Resistance
10KΩ
R6
Resistance
15KΩ
U4
J1
BT1
SW1
X3
U1
SW5
U5
IC1
SW3
SW2