ME 140L Lab 2 - LAB 2 SENSORS 1 OBJECTIVES Learn the basic principles governing the operation of some of the sensors used in Mechatronics 2 LIST OF

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LAB 2 SENSORS 1. OBJECTIVES s Learn the basic principles governing the operation of some of the sensors used in Mechatronics. 2. LIST OF COMPONENTS AND EQUIPMENT REQUIRED List of Components s Hookup wire AWG # 22. s LDR 27 k Ω (1) s LEDs (1) s Resistors : 10 k Ω (brown black orange), 1 M Ω (5) (brown black green), 1 k Ω (brown black red) s Thermistor : LM35DZ (1) s Hall effect sensor : MP101401 (1) s Magnet (1) s DC Motor + Mounted Encoder (1) s Light Source (1) Equipment required s NI Elvis station s Digital Multimeter s Oscilloscope s DC Power Supply 3. HANDS ON. 3.1 LIGHT DEPENDENT RESISTOR (LDR)--PHOTOCELLS Objective: Characterize LDR resistance changes when exposed to different illumination conditions. You will be measuring the resistance of the LDR indirectly (through the brightness of the LED) when it is exposed to a light source and when completely covered with your fingers. Use the light ‘puck’ as your light source, and cover the LDR with your finger to simulate ‘darkness’.
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3.1.1 LIGHT DETECTOR LDRs can be used to build simple but useful circuits to determine illumination levels. Build the circuit shown in Figure 1. Observe how the LED’s intensity changes when the LDR is exposed to light and when
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This note was uploaded on 09/18/2011 for the course ME 140L taught by Professor Staff during the Fall '09 term at University of Texas at Austin.

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ME 140L Lab 2 - LAB 2 SENSORS 1 OBJECTIVES Learn the basic principles governing the operation of some of the sensors used in Mechatronics 2 LIST OF

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