Simple Digital Countdown timer using 7-seg display

Simple Digital Countdown timer using 8051 and 7-seg display



A very simple Digital countdown timer using 8051 and 7 segment displays. A perfect project for microcontroller starters.

Author has used BCD to 7-segment decoder for driving displays. each segment has its own decoder. so there is no multiplexing included for displays. Additionally there are 2 control switches one to Start/Pause and second t... Read Compelte post
Posted on Thu Apr 08 2010, 07:34 AM

Simple Digital Countdown Timer using 7-seg Display

Project tested and working perfectly

A very simple Digital countdown timer using 8051 and 7 segment displays. A perfect project for microcontroller starters.

Author has used BCD to 7-segment decoder for driving displays. each segment has its own decoder. so there is no multiplexing included for displays. Additionally there are 2 control switches one to Start/Pause and second to Reset the timer. There is a Buzzer added to indicate time... Read Compelte post
Author: Prasad.K.Wagh | Date added: Thu Apr 08 2010, 07:08 AM

Conversation

ExperimenterUK
Mon Dec 03 2018, 06:17 PM
Please post questions in the forum. The chat box is for chat
Mon Dec 03 2018, 07:43 AM
help!me!
help! I don't understand busy flag!
Sun Dec 02 2018, 09:01 PM
ile
hello
Mon Nov 12 2018, 06:58 AM
Pavan_user
i have seen your replica of I2C programming using AT89C51 but i am unable to understand the "ack_bit" variable usage ...looks like it is always 1...can you elaborate how acknowledgment is working....
bgk3678
Tue Nov 06 2018, 03:36 PM
kindly any one give solution for my problem
ExperimenterUK
Mon Nov 05 2018, 10:48 PM
Pins high is the normal state. You need a program to set them low
mayengbam
Sun Nov 04 2018, 06:41 PM
hello, i am niranjoy, alll the port of my 8051 is always high, even i erase all the program. why is it so happen and what is the problem. any one please help me!
Sun Nov 04 2018, 03:16 PM
BASAVARAJ g kudamble
hi I am interfacing GSM 300 to 8051 microcontroller to receive message from mobile
ExperimenterUK
Sat Sep 29 2018, 07:28 PM
Please post questions in the forum.
Sat Sep 29 2018, 12:26 PM
Ashfaq Ch
hi i have some AT89C51RC microcontrollers already programed. some one help us to how to download from AT89C51RC and after study and edit all corractions reload to AT89C51RC controller

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