AT89C2051 ile Led Display göstergeli saat

| Mart 24, 2021 Tarihinde güncellendi
AT89C2051 ile Led Display göstergeli saat

Oldukca şık dijital saat devresi display üzerinde saat bilgisinin gösterilmesi kılasik fakat çevresinde 120 led ile yapılan gösterge ilgi çekiyor ayrıca alarm özelliğide var.

Microprocessor LED clock with alarm

at89c2051-clock-display-led

The clock is based on an Atmel AT89C2051 microcontroller. The AT89C2051 is a popular 8-bit 8051 clone with 2kB of Flash program memory and two universal parallel I/O ports. In this application it controls simple output devices: 4 seven-segment LED displays, an chain of serial shift registers, and a beeper. The only input to the microcontroller are 2 push-buttons connected via the external interrupt lines.

The microcontroller is driven by a 10MHz quartz. This value can be changed, but the timer interval variables must be modified adequately. Pins P1.0-P1.3 control the data input to all of the 74HC4543 LED drivers. Pins P1.4-P1.7 are responsible for latching the data. The microcontroller sequentially outputs the data and latches each display driver. The displays are typical 7-segment LED displays with common anodes.

The anodes are connected to +5V via four 1N400X diodes responsible for decreasing the voltage to a safe 2.5V. The two additional LEDs are for displaying the colon between the hour and minute.

Pin P3.7 triggers the acoustic generator based on a simple NE555 timer with a small transistor-driven speaker. This subcircuit is used by the clocks alarm.

The current second is displayed in a pseudo-analog way using 120 LEDs located on the clock dial’s perimeter. Two new LEDs are illuminated each second. The diodes are driven by eight 74HCT164 shift registers connected in a series into a big 64-bit register. The last 4 register outputs are not used and are loaded with normal 1k resistors.

Microcontroller output P3.0 is connected to the register’s input, while pin P3.1 simulates a clock line. Every full minute all 120 LEDs are lighted and the microcontroller must serially output 64 1’s to the register to turn them off.

The only input to the AT89C2051 are two NO (Normally-Open) keys located on the power supply. These 2 buttons are connected to the external interrupt lines INT0 and INT1. One of the keys is supposed to switch the currently modified variable (minutes, hours, alarm minutes, alarm hours), while the other increases that variable.

Kaynak: zpcir.ict.pwr.wroc.pl/~jarekp/

alternatif Dosya indirme LINK listesi (TXT formatında) link-10855.zip şifre-pass: 320volt.com

Yayım tarihi: 2010/08/01 Etiketler: , , , ,



8 Yorum “AT89C2051 ile Led Display göstergeli saat

  1. NoCommenT

    Bunun hex dosyasının çalıştığından emin olamıyorum. sizde çalışan kodlarmı var ? deneme yaptınız mı ?

    CEVAPLA
    1. gevv Yazar

      Devreyi denemiş olsam belirtirdim isisde devreyi kurup deneme yapabilirsiniz

      iyi çalışmalar

      CEVAPLA
  2. metin

    baskı devresi elinde olan varsa paylaşabilir mi proje ödevi için lazım çok teeşşekür ederim şimdiden.

    CEVAPLA

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