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EE40 Final Project

EE40 Final Project. Light Detection Circuit. Project Summary. Light-sensing circuit; When there is no light shining on the detection part of the circuit, the green LED flashes. At the presence of light, the red LED flashes instead of the green one. Possible application:…..

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EE40 Final Project

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  1. EE40 Final Project Light Detection Circuit

  2. Project Summary • Light-sensing circuit; When there is no light shining on the detection part of the circuit, the green LED flashes. At the presence of light, the red LED flashes instead of the green one. • Possible application:….. • Possible improvements:………

  3. Supply Circuit • Purpose: powers the circuit components by generating two different voltages from a single input voltage • Input: 9V • Output: 4.5V and 9V • Comments: The op-amp act as a voltage follower that outputs 4.5V. 9V 4.5 V

  4. Square Wave Oscillator • Purpose: Generates 0-9V square wave signal that makes the LED’s flash. • Input: 4.5V and 9V • Output: 0 or 9V 4.5 V 9 V

  5. Light Detection • Purpose: detects light • Input: 4.5V • Output: 0 or 4.5V 4.5 V

  6. Comparator • Purpose: compares the output of the light detector with the threshold • Input: 4.5V and 9V • Output: 0 or 9V 4.5 V 9V

  7. AND Gate 9V • Purpose: To control the flashing of the red LED based on the MOSFET’s drain

  8. Bonus circuit examples: VU Meter 500k

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