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TOPIC: I/O ports problems

I/O ports problems 5 years 9 months ago #764

  • argelia
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I am using a sm2315dt'I/o ports as an outputs to energizade some selenoids, their initial states have to be 0 because at the begining of the program i turn off all the ports, but here is the problem, everytime I turn on the motor their states are 1 for few seconds activating the selenoids, is it posible to avoid that?


pd: I/O ports activate some transistors which turn on the selenoids.
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Re: I/O ports problems 5 years 9 months ago #767

  • csearcy
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This is hard to avoid. One approach is to use a time delay relay or another output to enable power to the solenoid circuits.
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Re: I/O ports problems 5 years 9 months ago #770

  • argelia
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we already fix the problem, we have to use some voltage divisors along with some diodes at their respective transistor's base
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