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Build an effective sensing circuit that will be able to measure changes in light levels using an LDR.
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| Submitted: Tue Mar 23 2004
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Sensors Project Aim To build an effective sensing circuit that will be able to measure changes in light levels using an LDR. Safety * All wires should be checked that they are properly insulated to prevent electric shocks. * The voltage should not exceed the recommended manufacturer's limit for the resistors and bulbs used to prevent over heating or component damage. * Careful observation should be made to ensure no incorrect connections that could possible cause a shorted circuit. * Power pack should be fitted with a fuse and safety cut-out button. * Clear work area Apparatus * 12V Power Pack * 3V Battery Pack * 6 Leads with crocodile clips * Voltmeter * Ohmmeter * Ammeter * 5W, 24W, 36W and 48W bulbs * LDR * Rheostat * Black tubing Development To see how much the resistance of the LDR varies as light levels change I first made a small experiment to look at the actual resistance value changes. The distance between the LDR and the base of the bulb was...
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