Brand: CATALES - Quantity: 1 - Color: Blue + black - Material: FR4 - Hardware resources: - Battery holder: card powered battery for the real time clock chip so the board can continue counting down; - Buzzer: 5V DC buzzer do alarm clock key tone; - Photoresistor: Induction of ambient light intensity; - Thermistor: detect ambient temperature; - K1 ~ K3: chip can be scanned directly touch of a button; - U5: TM1636 ie four 8-segment common anode LED Driver IC; - U3: DS1307 namely real-time clock chip; - D1 ~ D4: blue green red red 3mm plug-in LED. - Digital tube: four 8-segment common anode LED with clock points while the decimal point is not displayed only for orientation recognition purposes. - Occupy the Arduino pin resources: total occupied 10 digital pins two analog input pins an I2C interface - D2: control blue LED1 - D3: Control the green LED2 - D4: Control the red LED3 - D5: Control the red LED4 - D6: control the buzzer; - D7: Connect TM1636 clock pin SCLK; - D8: Connect TM1636 data pins DIO; - D9: control keys K1; - D10: control keys K2; - D11: control buttons K3; - A0: Connect thermistor; - A1: Connect photosensitive resistance; - A4: Connect the DS1307 I2C data pin SDA; - A5: Connect the DS1307 I2C clock pin SCL.