Turn-key PCB assembly services in prototype quantities or low-volume to mid-volume production runs

Very simple countdown timer with 7 segment displays

This is very simple countdown timer implemented on 89C2051 microcontroller. One button is used to set time up to 99 seconds, another is for starting timer. Time is displayed on two 7 segment LED displays.

7_segment.gif

 

Buttons and display scanning share same pins so algorithm has to check buttons and display time on LED displays in a row sequence. Source code is included that allows yo modify program and compile.

[..Source link..]

Bookmark the permalink.

2 Comments

  1. New offer on 433mhz Rx Tx Module with free hard to find 51K resistance
    Now get 433mhz Rx Tx Module pair @ Rs 375.00 Only
    * offer for limited time

    http://onlinetps.com/ViewItem.php?ItemID=269

  2. how can i make this, i need to make it for school but i can’t find it elswhere on the internet can somebody explain it to me. i need a countdown from 60 seconds to 0 seconds.

Comments are closed