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ME 140L - Lab 2 - LAB 2 SENSORS 1 OBJECTIVES Learn the...

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LAB 2 SENSORS 1. OBJECTIVES square4 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 square4 Hookup wire AWG # 22. square4 LDR 27 k Ω (1) square4 LEDs (1) square4 Resistors : 10 k Ω (brown black orange), 1 M Ω (5) (brown black green), 1 k Ω (brown black red) square4 Thermistor : LM35DZ (1) square4 Hall effect sensor : MP101401 (1) square4 Magnet (1) square4 DC Motor + Mounted Encoder (1) square4 Light Source (1) Equipment required square4 NI Elvis station square4 Digital Multimeter square4 Oscilloscope square4 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
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