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Light Detection Circuit for LED Indicators with Voltage Supply and Control

This project outlines a light-sensing circuit that utilizes LEDs to indicate light presence: a green LED flashes in the absence of light, and a red LED flashes when light is detected. The circuit is powered by a dual voltage supply of 4.5V and 9V generated from a single 9V input. It incorporates a square wave oscillator that produces a 0-9V signal for LED flashing, a light detector to sense illumination, and a comparator to set thresholds. The design allows for potential applications in various light detection systems, with room for improvements in sensitivity and response time.

pandora-cummings
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Light Detection Circuit for LED Indicators with Voltage Supply and Control

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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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