C51 4 Bits Led Electronic Clock

$12.95 $11.99

C51 4 Bits Led Electronic Clock takes AT89C2051 as its core, a total of 16 electronic components to come true the two channels of the alarm clock, (8:00-20:00) on time alarm ,accurate adjustment , and other functions.

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C51 4 Bits Led Electronic Clock

$12.95 $11.99

SKU: 32400128918 Categories: ,

4 Bits Led Electronic Clock

  1. AT89C2051 based of four electronic clock kit
  2. Supply voltage: 3V-6V
  3. PCB Size: 52mm * wide 42mm

Functions:

  1. Seconds correction (for precise time)
  2. Switch to every minute independent display interface
  3. whole point of time (8-20 o’clock chime can be turned off)
  4. Two alarm settings (you can turn off the alarm function)

Kit Features:

  • 0.56 inch special red digital clock for display;
  • Import AT89C2051 for master chip;
  • 1.2mm thick PCB made from military grade FR-4 board;
  • accurate travel time, travel time error range error -1 to +1 seconds every 24 hours.

This kit contains a USB to 3.5mm power cord, plug in the USB charger can be used.

4 Bits Led Electronic Clock , it takes AT89C2051 as its core, a total of 16 electronic components to come true the two channels of the alarm clock, (8:00-20:00) on time alarm ,accurate adjustment , and other functions.

Parameters

NO.ParameterValue
1Operating voltageDC 3V-6V
2PCB board materialRF-4
3Size52mm*42mm

 Principles

The whole system by MCU minimum system, key input circuit, display circuit, buzzer circuit and power supply parts.

  1. MCU minimum system: including the U1 (AT89C2051), C1, R1 for power on reset circuit .Clock circuit is composed of C2, C3 and Y1.
  2. The pressed key input circuit:composed of S1, S2, short press the button once a loud buzzer rang, long press the button once two loud buzzer rang.
  3. The display circuit:4bits common cathode and on PR1 Resisters Packs .
  4. Buzzer circuit:composed of Q1, R2 and LS1, short press the button once a loud buzzer rang, long press the button once two loud buzzer rang.
  5. J1 is 5v power supply input terminal, C4 filtering.

Operation instructions

It will display 12:59 when Power-on,while is normal interface(“hours:minutes”). The both channels of alarm clock are opened.At the same time,the first alarm clock has been set at 13:01.the second alarm clock has been set at 13:02.

After power on ,short press S2.The display of digital tube will switch between “hours:minutes” and “minutes:seconds”;Long press S1 to enter the system Settings menu. there are A, B, C, D, E, F, G, H, I submenu. Short press S1 sub-menu plus increase by degrees。finally back to the normal interface

A Sub menu : Correction for hours

Display data will add 1 after press S2.after adjusted the A Submenu,then short press S2 to save the adjusted results and quit A submenu,enter B sbumenu

B Sub menu : Correction for minutes

Display data will add 1 after press S2.after adjusted the B Submenu,then short press S2 to save the adjusted results and quit B submenu,enter C sbumenu

C Sub menu:on time alarm switch

The default state is ON (on-time-alarm is open from 8:00 to 20:00)

It will switch between ON and OFF(on-time-alarm is closed) when press S2. Short press S2 to save the adjusted results and quit C submenu,enterD sbumenu

D Sub menu:The first alarm-clock switch

  • The default state is ON (the first alarm-clock is opened)
  • It will switch between ON and OFF(first-alarm-clock is closed) when press S2。
  • If set to ON, short press S1 to save and quit,then enter E submenu;
  • If set to OFF, short press S1 to save and quit ,then enter G submenu;

E Sub menu:The first alarm clock set for hours

Display data will add 1 after press S2.after adjusted the E Submenu,then short press S2 to save the adjusted results and quit E submenu,enter F sbumenu

F Sub menu:The first alarm clock set for minutes

Display data will add 1 after press S2.after adjusted the F Submenu,then short press S2 to save the adjusted results and quit F submenu,enter G sbumenu

G Sub menu:The Second alarm-clock switch

The default state is ON (the second alarm-clock is opened)

It will switch between ON and OFF(second-alarm-clock is closed) when press S2。

If set to ON, short press S1 to save and quit ,then enter H submenu;

If set to OFF, short press S1 to save and quit ,then enter normal interface;

H Sub menu:The second alarm clock set for hours

Display data will add 1 after press S2.after adjusted the F Submenu,then short press S2 to save the adjusted results and quit H submenu,enter I sbumenu

I Sub menu:The second alarm clock set for hours

Display data will add 1 after press S2.after adjusted the I Submenu,then short press S2 to save the adjusted results and quit H submenu, then enter normal interface.

Second correction:

Short press S2 in the normal interface,then enter “minutes : seconds” interface .Long press S2,make the second zero.Then short press S2 twice enter normal interface

Schematic

Note: there is direction for PR1 Resisters Packs , there is one side of the word in the direction of the MCU. Pay an attention!!!

Component listing

NO.Component NamePCB MarkerParameterQTY
1Metal Film ResistorR1,R210K2
2Ceramic CapacitorC2,C330pf2
3Ceramic CapacitorC40.1uf 1041
4Electrolytic CapacitorC110uF/25V1
5Network ResistorPR11K1
6Crystal OscillatorY112MHz1
7S8550Q1TO-921
8ButtonS1,S26*6*5mm2
9AT89C2051U1DIP-201
10IC SocketU1DIP-201
11Active BuzzerLS15V1
12Digital TubeDS14Bit Red1
13DC SocketJ13.5mm1
14Power CableUSB to 3.5mm1

Comments

comments

Weight0.05 kg
Dimensions15 × 12 × 10 mm
Supply Voltage

3V-6V

Condition

New

Operating Temperature

-20 ~ 60

Dissipation Power

NONE

Application

Alarm

Brand Name

IS

is_customized

Yes

Type

Timer

Model Number

C51 Electronic Clock Kit

PCB Size

52mm * wide 42mm

Feature

electronic diy kit, electronic modules

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