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LDmicro Forum - LED intensity varies during execution of code |
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LED intensity varies during execution of code (by Ziggy)
I am trying to sequence a few LEDs through a fixed pattern of light flashes.
I apply no modulation tot he LEDs other than the requisite patten of ON OFF steps. The LEDs are tied to +5V rail and the pins sink current through a resistors. So no modulation ... and yet the LED brightness varies during the excution of a sequence of 1 second flashes. Any advice or similar experience and resolution to the problem welcome.
(no subject) (by MGP)
Always post your program if you have questions, otherwise we have to guess.
(no subject) (by Ziggy)
hey MGP... I am sorry i made a mistake in posting the code.
It went into a new message titled sample code rather than as a response in this thread.
(no subject) (by Ziggy)
P.S. the procesor is ATmega8 runing at 8 MHZ.
As PLC cycle time reduces the aparent LED brightness improves. At zero ms cycle time it all turns to pudding; the timing is not appropriate.
(no subject) (by Ihor Nehrutsa)
HOW TO: Soft start and smooth stop of LED with software PWM
https://github.com/LDmicro/LDm...-stop-of-LED-with-software-PWM HOW TO: Soft start and smooth stop of LED with hardware PWM https://github.com/LDmicro/LDm...-stop-of-LED-with-hardware-PWM
(no subject) (by Ziggy)
Ihor,
thanks for the hints. The problem was caused by multiple rungs whihc controlled the output pins. So on each cycle the rungs woud be calculate,,, and subsequently as the output pin was calculate and recalculated durin the one iteratio the LED would be activated and deactivaed a number of times resulting in dimming of the led. My poor coding.
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