Design, implement and test a full digital instrument

General constraints (common to everybody)

6) You must use the LDR sensors supplied by the school. If you want to use your own, you will

need to submit a brief statement explaining the reason why you should be allowed this

advantage; approval is granted by the teaching team and decision is final.

7) You can use up to two separate light sensors

8) You can only use LM741 and/or TL081/2/4 as amplifier for this project. Your choice must be

declared and argued.

9) Your signal conditioning for the light sensor(s) must be a fully differential amplifier.

10) Your design must be protected against aliasing, the sample rate is personalized to you (see

next section).

11) In this project you are competing with your peers, as part of this assignment you will need to

submit a 3-4 minute video of you presenting/demoing your project/circuit. The aim of this

presentation is to convince the project managers (teaching team) to select your project/circuit

for manufacturing.

12) Arduino must be used to acquire data, for the submissions 2, 3 and 4. You are expected to

show the output of the LDR(s) and the final output of your circuit recorded on the Arduino

using the ADC ports (A0, A1 and A2). Note, your circuit must discriminate the ambient light

using your analogue circuit design, and not via code.

13) 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.

Additional Constraints

Constraints SET-B (random assigned number 4,5 or 6)

For your circuit you must use the DC coupled AC pass instrumentation amplifier configuration (see

lecture notes and INA118 technical documentations). Your sample rate is 40 Hz

Submission 1 (30 Marks):

For this submission you will answer a brief vUWS quiz composed by 3 questions:

Q1 (10 Marks): 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 (must be collated on a single image if

multiple pages) will be key in getting good marks, please annotate the schematic properly i.e. import

in Word, PowerPoint etc. so that you can add captions!!!

Q2 (10 Marks): The simulation results as single graph image. It must show without doubts that your

simulated circuit can fulfil the assigned specs. Tidiness and easiness of reading the image (must be

collated on a single image if multiple panels) will be key in getting good marks. You should import

the data from the simulation in MATLAB/Excel to produce a proper plot and add proper

caption/legend/labels.

Q3 (10 Marks): Principle of functioning. In few words (100-200) explain how the circuit works i.e.

the purpose of each stage and how the simulation demonstrates the results. You must include

calculations showing how you designed your stages where applicable. Calculations, images, tables

and captions are not included in word count.

Ingeniería eléctrica Electrónica Ingeniería Diseño de circuitos Diseño digital

Nº del proyecto: #28731616

Sobre el proyecto