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3 Interface
1.
USB Power & Download port:
supply 5V power or connect to PC so that you can upload the
sketch code to the board.
2.
DC Jack Power Supply:
you can use the battery case with DC Jack 5.5*2.5 head to supply
power for the board, should be 7~12VDC.
3.
4-Digit Display:
4 digit tube (0.36 inches) which can display the clock point, it needs
D10/D11 pins to control and display the integer, clock, stopwatch, score and so on.
4.
Buzzer:
5.
RTC Clock:
based on DS1307 high-precision real-time clock module, I2C interface, the
address is 0x68, it needs the CR1220 battery to keep running when the board is power off.
6.
LM75 Temperature Sensor:
I2C interface temperature sensor, not only can measure the
temperature, it can also set the temperature protection temperature, the address is 0x48.
7.
Infrared Receiver:
use D2 pin,It can receive the modulated infrared signal of 38KHz that is