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ME 140L - Prelab Assignment 2

# ME 140L - Prelab Assignment 2 - requirements—attach a...

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PRELAB 2 ASSIGNMENT NAME: _______________________________ SECTION: _____________________ 1) You need to measure the speed and direction of rotation of an electric drill using a rotary encoder. The encoder must satisfy the following: a resolution of 500 pulses or counts per revolution, 1.5” shaft mount, and quadrature outputs. Use the Internet to find a rotary encoder that will meet the stated requirements—attach a copy of the spec sheet describing the encoder and circle the specs on the sheet to show that the requirements are met. 2) A multi-port sequential fuel injection system needs to receive one pulse every time an intake valve opens. The sensor must generate pulses each time the valve moves past it, must operate in temperatures in the range of 32°-275°F, and be resistant to oil and grime. Use the Internet to find a sensor that will meet the stated

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Unformatted text preview: requirements—attach a copy of the spec sheet describing the sensor and circle the specs on the sheet to show that the requirements are met. 3) A circuit with a light dependent resistor (LDR) and an LED in series is shown below. Let the resistance of the LDR be R1 and the resistance of the LED1 be R2 VCC 6V LED1 LDR Derive an expression for the current flowing through LED1 and the time varying resistance R1. Why does R1 change with time? How does the current in LED1 change with changes in R1? How does the LED’s current affect the LED brightness 4. A voltage divider circuit is shown below with a resistor R1, LDR and LED. Let the resistance of the LDR be R2 and the resistance of the LED be R3, VCC 6V R1 1.0k Ω LDR LED Derive an expression for the voltage across the LED. How does the voltage across the LED change with changes in R2?...
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