IR Sensor using lm324

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IR Sensor using lm324

Postby paipai90 » Sun May 13, 2012 2:05 pm

Hi,
May I know how to measure the output voltage for blocking and non blocking condition?
Is the output voltage is bigger when in blocking condition than non-blocking?
Thanks.
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Re: IR Sensor using lm324

Postby shahrul » Sun May 13, 2012 6:06 pm

paipai90 WROTE:Hi,
May I know how to measure the output voltage for blocking and non blocking condition?
Is the output voltage is bigger when in blocking condition than non-blocking?
Thanks.

It depends on your voltage divider. IR Receiver is resistor changes. If receive IR Light, resistance LOW. If no IR Light, resistance HIGH. So, depends on your schematic you do pull-up or pull-down will determine the increase or decrease voltage output.
You can see sample here, IR Sensor.
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Re: IR Sensor using lm324

Postby ober » Tue May 15, 2012 4:58 pm

Try looking at one of our DIY project, PR4, you can download the details description too. It has explanation.
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Re: IR Sensor using lm324

Postby ABSF » Tue May 15, 2012 9:48 pm

LM339 (quad) or LM393 (dual) is more appropriate as comparators than LM324 though LM339 has open-collector outputs. But it has better hysteresis loops built-in.

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