AT89C2051 4 Bits Digital Electronic Clock DIY Kit ชุดประกอบนาฬิกาปลุก

• 1. Hour and minute display & minute and second display
• 2. Two alarms set up

• There is a buzzer that works as an alarm. When the clock reaches hours...like 1:00, 12:00, etc., it will beep for 3 times. The alarm beep is optional, you can disable it.
• The kit can be operated with a 3.3V to 6V battery.
• On the kit, you will see two switches S1 and S2 which are used to set up time and alarm.
• The time and alarm time are displayed with 4 digit seven segment display.

Documents: 

1. Assembly tutorial

2. How to use digital clock

3. Download manual