Author Topic: How to correctly meaure an LDR?  (Read 2134 times)

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Offline orbiter

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How to correctly meaure an LDR?
« on: February 22, 2011, 11:39:43 am »
Hiya fellas,

Got some new light dependant resistors today in a variety type pack, so they're not rated, so... How do I measure them correctly please?

Is it in total darkness, shade... Or some sort of average?

Thanks guys

regards

orb

Offline PeterG

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Re: How to correctly measure an LDR?
« Reply #1 on: February 22, 2011, 12:42:36 pm »
Are there any markings on it at all?

This webpage may be a good starting point.
http://www.technologystudent.com/elec1/ldr1.htm

Regards
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Offline orbiter

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Re: How to correctly meaure an LDR?
« Reply #2 on: February 22, 2011, 01:33:50 pm »
Are there any markings on it at all?

This webpage may be a good starting point.
http://www.technologystudent.com/elec1/ldr1.htm

Regards

No mate, I've checked all of them. No markings at all :(

They're just the very basic type, similar to This LDR and are measuring a dark resistance of around 500k, now this could be pretty close I guess, but I'm not sure if just putting a rag over the end of them, then measuring the resistance is an efficient way of doing it?

regards

orb

Online NiHaoMike

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Re: How to correctly meaure an LDR?
« Reply #3 on: February 24, 2011, 08:46:05 pm »
Put it into a box with a LED and a reference sensor. Vary the LED brightness and note the changes.
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Offline orbiter

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Re: How to correctly meaure an LDR?
« Reply #4 on: February 24, 2011, 09:21:30 pm »
Put it into a box with a LED and a reference sensor. Vary the LED brightness and note the changes.

Thanks Mike. Is that a legitimate & accurate way of measuring them?

Regards

orb


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