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LDmicro Forum - LD micro tutorial |
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LD micro tutorial (by ritesh )
Hi,
here in tutorial given how to blink LED for 250s and off for 250s it working fine but i am changing the on & off time for 1s than its not working can any one help for this thanks
(no subject) (by Jonathan Westhues)
In the tutorial, the LED blinks on and then off for 250 milliseconds each, not seconds. If you wanted 1 s, then it's still necessary to enter the delay in milliseconds, as 1000 ms.
If you wanted 1 ms, then the cycle time is too slow; you would have to make it much faster, like 0.1 ms. In that case, make sure to use a fast crystal, and to keep the program as short as possible, to ensure that it has time to execute in those 100 us.
(no subject) (by dio)
I use instruction TON, TOF with a delay time 1000 ms, but after I run with Atmega 8, X-TAL 8 MHz, the result of delay time greater than 1000 ms. how to equalize the value. thank you
(no subject) (by MGP)
Can you upload your program?
I think that you forgot the cycletime.
(no subject) (by JOHN)
flasher test
(no subject) (by MGP)
You have to make an oscillator and use a contact of the outputpin or relay to interrupt the circuit.
I have made an example.
(no subject) (by MGP)
Ow this example was from JOHN, i didn't see it until now, sorry
Here you have another example.
(no subject) (by Boris)
I noticed that timers are less accurate if program is longer, is that possible?
(no subject) (by MGP)
Yes, if you set the cycletime for example on 0.3mS and you have a long program then its possible that LDmicro does not give a warning, but still runs the program after compiling.
The real cycletime is longer than the cycletime setting by several instructions. The only thing you can do is set the cycletime longer, or use the "masterrelay" instruction, if you need timecritical programs.
(no subject) (by JOHN)
are you watching for the red column at the right? if cycle is fast you wont see it if you look lower down you can watch the state change you will then know it is working even though the on the right side changing red just a thought
(no subject) (by Boris)
No John i tested in real life using stopwatch my program is like "Timer_1sec" only I count takt and use it as timer on which You can set value.
(no subject) (by MGP)
Boris, read this topic also.
Jonathan gives you the solution. http://cq.cx/ladder-forum.pl?action=viewthread&parent=509
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