1 Digital Light Meter by Ak Muhammad Saufi Final Year Project.
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Transcript of 1 Digital Light Meter by Ak Muhammad Saufi Final Year Project.
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Digital Light Meterby
Ak Muhammad Saufi
Final Year Project
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Contents1. Objectives of the project2. Introduction3. Implementation of the project4. Schematic Overview5. Programming flowchart6. Testing and Results7. Conclusion8. Recommendation
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1. Objectives of the project• To measure the level of light at a sensor• To display the value of the lux in a qualitative
manner on the LCD• To collect data recorded• To give an idea of the light cycle for duration of
data collected
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1.1 Project Timeline
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PlanningData Gathering
ExecutionTesting
Report Writing
June 2011 July 2011 Sep 2011 Oct 2011 Nov 2011 Nov 2011
Completed
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2. IntroductionWhat is Digital Light Meter?It measures the control parameters based on the
intensity of the ambient light.
Tool Used;Hardware – Micro controller (Arduino Uno)Software – Programming (Arduino IDE)
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3.1. Hardware ImplementationMain Components;
16 x 2 LCD Display
Arduino Uno microcontroller
Light Dependent ResistorPrototyping shield
3. Implementation of the project
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Additional Features
3.1. Hardware Implementation
The Data LoggerReal Time Clock (DS1307)
Temperature sensor (TMP32)
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3.2. Software ImplementationMain Element – Arduino IDE;
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4. Schematic Overview
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4.1 The Assembly of the ComponentsBlock Diagram
The Block Diagram of the Digital Light Meter
The Block Diagram of the Data Logger
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4.2 The Complete Circuitry Board
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5.Programming Flowchart
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6. Testing and ResultsMethods & Steps;Testing on different real environments
- Table lamp- In a refrigerator
Data LoggingPlotting the results
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Resistance vs Light level (Theory)
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Linear characteristic on logarithmic graph
Resi
stan
ce o
f LD
R in
kΩ
Light Level in Lux
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6.1 Test Results (Table Lamp)
• When a brighter light level is directed towards the sensor, the resistance is lower.• When a lower light level is directed towards the sensor, the resistance has risen dramatically
The Temperature sensor being squeezedUntil it warms up.
As the Light meter is shone brightly onto the table lamp.
Light
level (l
ux)
Tem
pera
ture
(F)
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6.2 Test Results (Refrigerator)
The data logger The 9V battery
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6.2 Test Results
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6.3. Typical Measurement
Results based on using 1kΩ Resistor
• When a brighter light level is directed towards the sensor, the resistance is lower.• When a lower light level is directed towards the sensor, the resistance has risen dramatically
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7. ConclusionThe results demonstrated that the digital light meter is functioning as per intended design, and meeting the overall project objectives.
The project is successfully implemented, within a timeframe which total cost estimated at $170.00.
Some typical applications of the equipment can be used for monitoring and recording light sensitivity and temperature such as light testing in the factory, home, office, farming, hospital, laboratory and food storage for preservation. It can also be used for trending on condition change for analysis or investigation.
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8. Areas for Improvement (Recommendation)
- Use a 1kΩ resistor and adding 2kΩ resistor series to it improve much better reading of
lux in bright lights.
- Have more than one sensor (or setups) to collect data from more than one sample
area
- Also, incorporate a temperature sensor to send signal directly to LCD display by using
the microcontroller
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Demonstration
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