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Topic: Infrared Sensor (Read 3 times) previous topic - next topic

Grumpy_Mike

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But why such a high low voltage?

Because the output transistor is either damaged or it is oscillating.

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but it worked, sort of, with the LED

That could be the problem the absolute maximum rating of that output transistor is only 5mA. How much current was the LED drawing in that test? That could have fried it.

baum

It still works with the LED, though.
And it was always dim. I was using a 10k resistor, and it didn't turn completely off.

Grumpy_Mike

With 10k it should be fine. The tutorial said 200 to 1000R. Try enabling the internal pull up resistor and seeing if you can sense anything.

baum

Should I pull it high or low?

And why, why, Grumpy Mike, would the LED change its brightness if there was only a change of about 100mV!?

janeik


Should I pull it high or low?

And why, why, Grumpy Mike, would the LED change its brightness if there was only a change of about 100mV!?


You set it in high state to activate pullup.

regards

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