C code example for reaction timer using PIC 16F877 microcontroller

Hi,

How do I write a code for a reaction timer in C programming using 16F877 chip?

Thanks!

What do you mean exactly mean by Reaction timers? can you please elaborate as in what you intend to do, so that we can help you better

The functionality of the RT is as follows:
Pressing the RESET button turns an eight-in-row LED display off. After a random
period of time, not exceeding 10 seconds, ALL eight LEDs light up simultaneously.
The person undergoing the test is asked to press a STOP button as soon as he/she
observes this. The time interval between the event of the LEDs coming on and the
instant the STOP button has been pressed is the reaction time of the person being
tested. After the STOP button has been pressed the reaction time (in milliseconds) is
displayed on the eight LED display. Pressing the STOP button prematurely results in
a 255 ms penalty.
Options.
 Use a single button to Reset and then Stop the RT.
 Use the Seven Segment Display in place of the binary display.

Enable storing and displaying of the best and the average reaction times
obtained in a series of subsequent test runs.
i have attached a file of the code i have attempted. i cant get out of the second loop to get back to the first one .i have employed an interrupt and want to show the reaction time on seven segment. lets hope this will assist.

Quite simple this

Your timer which is on an interrupt

First interrupt is the hardware interrupt i.e your button press
You could have a second interrupt which interrupts the timer every second


Makes life easier and easier to work with

Your program should be start the timer
[code]
Start ::
Enable the timer interrupt
Enable hardware interrupt

While not hardware interrupt

If timer interrupt
Increment seconds and store value in seconds
End if
End while

If hardware interrupt
Stop timer store value
Implement look up table for seven second display
Output seconds
Output minutes
End if

Wait for start button
On start button press
Clear timer

Go back to start and do again

[/code]


Simple if you write an algorithm first ,draw a flow chart and coding becomes easy

Golden rules for doing this

First the hardware then the algorithm then a flow chart finally code and test

You will find this so much easier if you do follow these instructions

Less of a headache I find

Also it might help if you showed the forum some diagrams and flow charts as well They tend to answer questions then because it shows you’ve made some effort rather than just plonk a bit of code in front of them with the incorrect processor directive I notice straight away and no look up table to output to seven segment display also no method

This gives the impression that all you’ve done is copy some code, haven’t got a clue as to what’s going on or even tried to understand what it is your trying to do

This puts people on a negative straight away but that’s just some general advice really, You will get far better answers if you do approach these questions this way

Also not meaning to be rude if you said "Hi all Please could someone help me with this and gave at least some explanation it sounds nicer and more friendly and again you will find people more helpfull "

But thats just something else i notice about comments here This demanding story is very negave and it upsets people