PIC16F690 with NE555

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  1. - 28th September 2008, 00:47 #3
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    Thank you for your reply.

    1. Do you have a resistor between the PIC output pin and the base of the transistor?

    -> Yes, I call it RB, I calculated the value empiricaly (I have to check on my board if it is a 3.3K or a 4.7K)

    2. Do you have a pull-down resistor on that output pin?

    -> No I don't...

    3. Why do you need the 555 at all? It seems like it would be just as easy to use the PIC as a one-shot to control the transistor to control the relay.

    Because I need the MCU to go on doing stuff whle the NE555 is outputing for a specific delay, independently of the MCU. I need the MCU to get rid of the job.
    Last edited by xnihilo; - 28th September 2008 at 01:14.
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