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build a circuit (NEED PART 1 TO BE DONE BY THIS SUNDAY NIGHT)

Design and test a digital (Arduino based) output light sensor capable to adapt and erase the ambient light. You will prove its functionality by showing an output value of zero (or close) when the sensor is exposed to an arbitrary constant light source i.e. ambient light. The design must then show a variable output when exposed to a generated fast frequency light source, in addition to the ambient light source. The frequency of the variable output must be proportional the frequency of the fast frequency light source in presence of ambient light (i.e. not in a dark room). In other words, you can see this system as a light source frequency discriminator; it must be able to discriminate between a pulsing light source and the ambient light, i.e. ambient light, is automatically erased.

General constraints

• must use the LDR sensors (photo rheostat).

• can use up to two separate light sensors

• can only use LM741 and/or TL081/2/4 as amplifier for this project. Choice must be declared and argued.

• Arduino must be used to acquire data, for the final submission must use only the A0 channel; during debug you can acquire data from as many analogue channels you like

• Arduino must be used to control a variable light source (LED) and generate a known light pattern that should be visible in the acquired data.

(MUST) Additional Constraints

Must use the sensor(s) into a bridge for the circuit

Part 1:

For this part you will answer a briefly 3 questions:

Q1: The simulation circuit diagram, for the purpose of the simulation, your ambient light is to be modeled as a DC source and the variable light as sine wave of suitable amplitude and frequency. Tidiness and easiness of reading the schematic

Q2 : The simulation results as single graph image. It must show without doubts that your simulated circuit can fulfil the assigned specs.

Q3 : Principle of functioning. In few words (50-100) explain how the circuit works i.e. the purpose of each stage and how the simulation demonstrates the results.

Part 2 :

For this part you will answer a briefly 3 questions:

Q1 : The functioning virtual breadboard assembly. Tidiness and easiness of reading the circuit

Q2 : A high quality photo of your real breadboard. Tidiness and easiness of reading the circuit

Q3 : Principle of functioning. In few words (50-100) explain any differences between the simulated circuit and the real circuit and your preliminary results. i.e. what is the error on the real analogue measurements, and how did you tweaked components value(s) to fulfil the specifications.

Part 3:

For this part you will answer a briefly 2 questions:

Q1 : Your annotated Arduino code. Use plenty of comments and submit your code pasted into a PDF file. Include the compile result as well, if we have doubts, we may require you to submit the .ino file.

Q2 : Your PCB files collated into a single image, please use proper labels and captions. Include the schematic(s) and the 2D design of your board, not a 3D rendering. If double sided, include both sides of the board.

Part 4:

For this part you will upload a brief video demonstrating the circuit functioning.

only usable elements:

capacitor:1uF,10uF

ldr: photoresistor

arduino UNO R3

UNO R3Proto Shield V3

Resistors: 220,ohm, 1 kohm, 10 kohm

NPN transistor

PNP transistor

RGB LED

YELLOW LED

GREEN LED

BLUE LED

RED LED

Навыки: Simulation, Схемотехника, Arduino, Техника, Измерительная техника

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( 5 отзыв(-а, -ов) ) Merrylands, Australia

ID проекта: #27327347

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