Building an IR circuit to trigger a solenoid

Discussion in 'The Projects Forum' started by bcwebb73, Jul 24, 2008.

  1. bcwebb73

    Thread Starter New Member

    Jul 24, 2008
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    Hi,

    I am trying to build a circuit that uses an IR sensor to trigger a solenoid. When the IR sensor is triggered, I need a 30 second delay before the solenoid is triggered. Also, if the IR sensor is triggered again before the 30 seconds are up, I need the timer to reset to 30 seconds. Currently, I am using an IR sensor, a 555 chip and a solenoid. Do I only need 1 555 chip and what resistors/capacitors do I need to program it to delay for 30 seconds? Thanks in advance for any help someone can offer on this project.
     
  2. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    Everyone will want to see your circuit diagram (schematic) before responding in substance. As for general advice, get the IR detector part working first. Once you have a reliable signal and no false signals, making the solenoid drive will be straight forward.

    John
     
  3. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    555 monostables are not retriggerable as far as I know. You will probably need to use a retriggable monostable such as: 74HC123 (5V) or CD4528 (<18V).

    Ken
     
  4. lishiaj

    New Member

    Jul 24, 2008
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    how do u test to see if an IR detector is working?
     
  5. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    We need to see your circuit. Presumably, your detector gives a high or low logic (or similar change) with detection. Monitor that signal and be sure it is what you need. John
     
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