USB 5V Four Digital DIY Clock Kit Two Alarm Function




Price:
US$7.85

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USB 5V Four Digital DIY Clock Kit Two Alarm Function

Feature:

Model:PCK-4
Supply voltage: USB (5V)
PCB size: 108 x 36mm
Display color: Red, blue optional

Based on AT89C2051 microcontroller:

1. Two Alarm
2. 8:00 – 20:00 hour chime
3. Accurate working time
4. Precise setting time
5. Power Off Memory
6. Large screen display (1 inch LED)

Rationale:

The entire circuit contain the smallest system, keybutton input circuit, display circuit, buzzer circuit, power circuit and Backup battery power supply circuit.

1. The smallest system: including U1 (AT89C2051), R5 and RET manual reset circuit, C2, C3, Y1 constitute a clock circuit.
2. The key input circuit: including S1 and S2, short press the button buzzer once, long press    the  button buzzer twice.
3. Display circuit: contain with four common anode and Q1-Q4 transistor drive circuit.
4. Buzzer circuit: contain with Q5, R6 and LS1 components.
5. J3 is 5V power input, C1 filtering.
6. The backup battery power supply circuit: contain with BT1, D1 and D2, when external 5V power supply, D1 is turned on by a 5V power supply, then D2 is turned off, the backup battery BT1 no current consumption. When the external 5V power outage, D2 immediately turned on, BT1 power supply.

User manual: Click to open

Package included:

1 x DIY clock kit


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