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Investigation of a light dependant resistor.
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| Submitted: Mon Apr 05 2004
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Investigation of a light dependant resistor Light dependant resistors or LDRs are resistors which alter their resistivity according to a particular light level. I am going to find out how these work and use them in a context so I can use them to locate a light source. To do this I must firstly find out how light effects the LDRs and then use this data to try and create something in order to detect a light source and locate it. Results Distance light is away from LDR Voltage reading (supply-12v) 5cm 11.5 10cm 10.9 15cm 8.7 20cm 6.4 25cm 3.7 30cm 1.9 As you can see from these results as the light intensity increases, the resistance decreases. I need to find the range of light levels the LDR can detect and distinguish how sensitive it actually is. The maximum resistance it is possible to get from the LDR is 550k?. This is when there is maximum light shining...
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