How to turn off the Boe Bot after 90 secs?

Christj

Any idea, how to stop the Boe Bot after it moves randomly 90 seconds?

Thanks in advanced.

Best Regards,

--chris

PJAllen

So, you have some "random" routine to run through·inside a Loop, say, and that takes·some given time to execute.· You time it once and then program it to repeat so that it's running for 90 seconds (e.g. once through = 5 seconds, then repeat it 18 times)·--

FOR X = 0 TO 17
GOSUB Dry_Run
END
 
Dry_Run:
 'the random movement subroutine program
 RETURN

Skywalker49

Intersting, what to do if the Dry_Run routine has not a fixed length in time which will be the case I assume?

Thx,
Ed

DiablodeMorte

I would probably go use some type of time chip. Check the seconds every few seconds and if it's > 80 seconds since he start shutdown

Skywalker49

Sounds like a good idea .. or what was mentioned in another thread, use a 555.

Check this out:
http://forums.parallax.com/forums/default.aspx?f=5&m=180588

rokicki

Because the moters need to be pulsed at 20ms (50 times a second), just increment a counter every time you send
out a pulsout command. After 4500 increments, you can power off.

DiablodeMorte

Also, if you are truly dependent on shutdown @ 90seconds(I'm assuming this is for a competition where they disqualify you if you run over) make the first action set the ALARM time on a time keeping chip(Pocket Watch B or that new shiny Dallas time chip) and make it so the ALARM pin triggers a relay which physically cuts power to the bot.

Skywalker49

rokicki said...
Because the moters need to be pulsed at 20ms (50 times a second), just increment a counter every time you send
out a pulsout command. After 4500 increments, you can power off.

My experience with timing based on loops with PAUSE xx is that the overhead of even a small loop
(IF THEN) is already 1-2 ms. So depending on what the robot is doing - remember, it's a random process -
the loop·cycle time·will vary or even vary a lot.

I think that reasonable timing can not be done without an RTC or a 555 as described in
the thread I mentioned earlier.

have a nice day
Ed