Optical Sensor for Noise Flickering
Group Members
Eric Cheung; Lee An Min, Amanda; Loh Jia Ying Whitney
Summary
Set-Up
Equipment Needed
- Soldering Iron
- Soldering Tin
- Shrink Tubes
- Wires
- 100k Ohm Resistor
- LDR Photoresistor: GL5528 / GL5537
- 3V DC Power Supply
- OpenBCI Board
Experimental Set-up
Circuit design concept
The circuit consists of a simple potential divider, with a resistor and a photodiode. By exposing the photodiode to visual noise tags, such as the flickering of LEDs, the output voltage The LDR’s resistance is a function of light exposure. The resistance is reciprocally proportional to light intensity. Thus, by exposing the LDR to any of the visual noise tags (e.g. the flickering buttons on the screen of your computer) The output voltage mimics the behavior of the flickering pattern.
Variables
The performance of the photodiode will be determined by varying the following parameters: 1. Wavelength of LED 2. Resistor in circuit 3. Frequency of blinking
The dependent variables that will be measured are: 1.
This will allow us to determine the following parameters: 1. Efficiency (Time decay) of photodiode at different wavelengths
Timeline and Milestone
| Week 8 (11 - 15 Mar) | Complete circuit set-up on PCB and prelimary measurements | |
| Week 9（18 - 22 Mar) | Data collection (vary LEDs) | |
| Week 10（25 - 29 Mar) * Well-being day (28 Mar), Good Friday (29 Mar) | Data collection (vary resistance) | |
| Week 11 (1 - 5 Apr) | Data Analysis and further measurements (if needed) | |
| Week 12（8 - 12 Apr）* Hari Raya (10 Apr) | Data Analysis and explore other light sources (phone/computer screens) | |
| Week 13 (15 - 19 Apr) | Analyse experimental results and complete documentation |