2017-2018 TEI3M Engineering Tasks

 

I2C Data Logger. This project requires that you capture (multiple) sensor data over a period of time and log it with the Time/Date stamp from an I2C-compatible Real-Time Clock, to a I2C-compatible 256K EEPROM IC. The expectations for the project include a high build quality from the circuit itself to the encasement and access points. Finally, the data collected is to be displayed using a creative form of visualization. This presentation can be in Processing, a connectable graphics screen, Excel, or any other form of graphic depiction.

There are a wide variety of analog sensors on the market as well as I2C sensors. The sooner you identify the concept/data you wish to log, the more time you'll have to secure an I2C sensor(s). Think creatively, simple monitoring of room temperature would demonstrate the least amount of imagination. On the other hand, a recent or upcoming lab from one of your science courses might be the perfect opportunity to apply sensor monitoring to. The Science department may even have their own sensing devices that you could interface with...

Some of the best projects will be based on a concept, principle, law, or research the engineer sets out to try to confirm or refute.

Design Considerations. In addition to CODE design decisions you make along the way as you develop your sketchs, this project requires that you make DATA design decisions as well. The use of the finite, byte- and page-oriented Serial EEPROM IC requires that you give deep consideration to the organization and design of the data you store for later retrieval. You are aware that the time and date data from the RTC is already in byte form, whereas the ADC data from analog read appears as two-byte ints [0-1024).

Note. You will present your work to your peers. In addition, this project will have a competitive side as each student will rank the other 19 projects in order of creativity, performance, build quality, etc. I'll aggregate the result and assign credit in relation to the results. Here is the evaluation page that will be used.

ER summary due Tuesday May 3 under the Subject Line: I2C Data Logger.

I2C DS1307 RTC I2C 24LC256 EEPROM Sensors

Medium ISP. See Description.


Short ISP. See Description.


Audio Frequency Spectrum Analyzer and Display. As the title suggests you are to develop a device capable of receiving an audio signal (microphone and/or 3.5mm line in jack ) analyzing/splitting the signal into 7 different frequency bands (MSGEQ7) and displaying the levels in some manner,

Day 1. ATtiny84 Stable Display on your 0.8" LED Matrix

  1. Before you read and display your audio data dynamically, you need to gain familiarity with the ATtiny84 and revisit your ability to use a PoV strategy to display a static image on your 0.8" LED matrix. The graphic to the right could be interpreted as a representation of 7-band audio sample. Create an uint8_t array of length 7. hardcoded with the EXACT displayed data to the right. It might start something like,
          uint8_t spectrum [7] = {0x01,0x03,...};
  2. Employing a PoV software technique and two chained shift registers (3 control lines max) create a static, flicker-free image of the display to the right on your 0.8" red LED matrix.

 

Day 2. ATtiny84 Dynamic Display with Dual Inputs (Line In and Electret Microphone) and MSGEQ7

  1. Review this description of 3.5mm TRRS audio jacks from http://www.cablechick.com.au
  2. Take a close look at the 3.5mm breakout board from Sparkfun: https://www.sparkfun.com/products/10588
  3. Review the product information for Adafruit's Electret Microphone with Auto Gain Control. and then review their wiring tutorial for the device.
  4. One of the most straightforward MSGEQ7 instructionals on the web is this one: http://nuewire.com/info-archive/msgeq7-by-j-skoba/. REview this tutorial and understand the code provided.
  5. Now, plan out your SINGLE breadboard with the MIC and LINE IN options under slide switch control as the inputs to the MSGEQ7.
  6. Wire the new active components into into your current hardware, together with the additional passives (caps and resistors). Provide input to the MSGEQ7 from either one of the two input devices and cable you've been LENT. After reviewing Skoba's code, blend it into your previous static display sketch (above).
  7. Confirm your prototype device displays the audio input dynamically on your LED matrix. To do so effectively (without flicker) you'll have to program your ATtiny84 for a minimum of its 8MHz internal clock. Be sure to test both and confirm BOTH audio input devices. Use your SPDT slide switch to switch inputs from one to the other. This online frequency generator can be used to test and confirm each of the seven frequency bands.
  8. (Future) Two weeks from now you'll see how straightforward it is to develop a PCB for this project. As simple as that is, open source vendors such as Adafruit and Sparkfun often supply supporting files to make the job even easier! You already have the ability to design and print a case for you projects...so, hmmm, all you have to do is imagine, dream and start creating....

Day 3. Device Commitment (For the future...)

We have suggested/introduced/explored a number of concepts and components you are encouraged to align your interest and research with. These include,

Submit to handin by midnight, Saturday February 24. with the Subject Line: Frequency Spectrum Analyzer.

You will have a few minutes to present your project to your peers on Monday February 26.


DIY Bicolor LED Display. in the spring of 2014, T. Garrow (ACES '15) asked me what he could design and render on the 3D printer he received for Christmas. I suggested a double-sided jig that ACES could use to fabricate their own LED matrix and he did just that! A class set of on-site printed jigs was impractical as the print time for a single one exceeds 2 hours. Fortunately, a company stepped in (Objex Unlimited) and printed two dozen for us in the spring of 2017, so the project became a reality.

Matrix Jig (T. Garrow, ACES '15) Partially Assembled BiColor LED Matrix

Take your time with this for better results. You may wish to review the numerous videos and tutorials available that describe how to construct and exercise 2D matrices and 3D cubes, both for the technique and the inspiration. For this task you will position the 16 Bicolor LEDs into the jig you have been provided in, oriented in such a way that, when bent, sets of four longer leads overlap (since these a bicolor LEDs I hesitate to refer to them as positive and negative). Solder each set of 4 together as in the photo, above right. AFTER SOLDERING EACH ONE use a bench power supply set to 2V to confirm the integrity of your connections. Make any adjustments to keep the leads AS STRAIGHT AS POSSIBLE.

Next, we do the same with the shorter leads, soldering in sets of 4, at right angles to their longer counterparts. Note. To avoid the possibility of electrical shorting, slide a short length of narrow heat shrink tubing over the potential problem areas. Click the photo above right to see an example of my use of clear tubing. Again, use 2V to test all 16 LEDs. I added a length of heat-shrink on the ends for additional support.

If you've made it this far you have 8 accessible leads, perfect for PORTA manipulation of the ATtiny84.

Task.

  1. You are aware that as few as three control lines are required to drive a sequence of shift registers. As such, you could use an ATtiny84, ATtiny85 or ATmega328P Arduino or standalone. If you are considering a tiny-based PCB project in the weeks ahead, you might consider using one for this project. The discussion that follows employs an ATtiny84 that has just enough pins to avoid the need for shift registers at all!
  2. Connect the 8 leads of your bicolor LED matrix to the PORTA pins of the ATtiny84. (ATtiny84 datasheet)
  3. Watch this 13s video of anactive bicolor LED Matrix. displaying a simple sequence that requires just three lines of code in the loop() function.
  4. Mid-level code for this project could use direct access to PortA on the ATtiny84 through its DDRA and PORTA IO Registers.
  5. A unit8_t array can be preloaded with values and 'played' by assigning the elements of the array in seqeunce to PORTA. Design and implement your own UNIQUE animated pattern that plays continuously and incorporates both colors simultaneously. You will eventually present this pattern to the class and any duplicate patterns will earn an unflattering score:( After all, given the infinite number of possibilities, what are the chances two guys develop the same one? Answer: infinitesimal.
  6. (For the curious) Once you have your pattern array just the way you like it, you might store it in EEPROM as a welcome message or startup sequence for some future project.
  7. (For the extremely motivated) Use LEDS with 3 leads to make a 4x4x4 3D cube.
  8. (For the insanely motivated) Flip the jig over and use 64 3mm bicolor LEDs for a higher resolution matrix that would support your own implementation of the Game of Life algorithm.

Persistence of Vision Challenge 2. Quite apart from the refreshing level of engagement that I witnessed in class on Monday, one student even wondered why we hadn't been doing this intense work since September? Hmmm....

  1. You will be given a number of additional parts in class on Friday January 29 and the details of a task, not dissimilar to your previous PoV Challenge. You will undertake the challenge is the same manner as Monday, seated at your station until the exercise is completed or the end of the period, whichever comes first.
  2. Wise ACES always read the datasheet(s) thoroughly! Ask yourself how many hours you lost on the previous Challenge because of faulty assumptions.
  3. Another time killer: hasty, low-quality builds. Again, how much time was wasted ripping out sloppy wiring? Do it right > do it once.
  4. Everyone will leave their Arduino circuit power-ready for me as they leave the DES promptly at 12:30. I will evaluate what you were able to accomplish on your own. Return to the DES no sooner than 1:15 to collect your gear and be ready for a second evaluation at the start Tuesday's class.
  5. Your challenge is to present a stable duplication of the image (below, right) on your LED Matrix.
  6. Your supplemental Parts List includes the following,

    # Part
    1
    Large Breadboard
    1
    8x8 Dot Matrix Display (BL-M12A881UR-11 or 1088AS)
    (same pin outs for both)
    1
    (additional) 74HC595 Shift Register
    (you'll need two)
    20
    3" (M/M) Jumper Wires


POV: Dual 7-Segment Display Application. In class we developed and implemented a working solution for this task. Your challenge is to integrate this circuit into a meaningful application. Submit an ER summary of your application to handin by Saturday January 20 under with the Subject Line: POV: Dual 7-Segment Display Application.

 

 

 

 


Analog Sensors. (Dig in, Take Risks, and Blaze Trails for the next generation of ACES)

Reference: Exploring Arduino, pp. 41-59.

Tutorial: NYU: Serial Output from an Arduino to Processing

This project provides you with an opportunity to explore and showcase both your technical and creative skills. We have discussed the Model-View-Controller (MVC) design of project architecture. Your understanding of how to obtain and capture analog readings on the Arduino can produce the Model. Your experience in the use of the Processing language (Grade 10) to provide compelling visualizations will provide the View. All that remains is your ability to write great (efficient, documented, etc.) code to provide the Controller aspect of the MVC design to pull the project together.

Sensors yielding varying analog voltage levels are available for monitoring almost any kind of natural phenomenon. Sparkfun offers a kit with a wide variety of them. Your toolkit comes with a few useful sensors that change resistance in response to external stimulation. The simplest one is the rotational actuation of the sweep arm of a potentiometer. P. Bagga used two of the these to manipulate the XY coordinates in his Grade 10 Etch-A-Sketch ISP. The LDR changes in response to incident light. Your TMP36 sensor yields varying voltage under changing temperature conditions. Your GP2Y0A41SK0F Sharp InfraRed distance measuring sensor is the most expensive sensor in your kit and could be used as a basis for a simple Theremin. Two of the more elaborate analog sensors from Sparkfun include the RGB Light Sensor and Triple Axis Gyro. The latter two are likely available at Creatron.

A few years ago, a Grade 11 ACE attached 6 temperature sensors to his Arduino, monitored the readings in round-robin style and placed streamed the data to the Serial port. Processing collected and recorded the data in a 6 by 100 matrix for his model, simultaneously presenting a view of the data below left. In 2015, R. Fletcher used the simulation of 5 TCRT5000L IR sensors below right to build his detection board to guide his Rover along a line.

TMP36 Temperature Sensor View TCRT5OOO IR Sensor View

The two views above (line and bar) are two common ways to present the data. There are many others you have encountered either through your experience with Excel and/or various Presentation applications. The monitor on the first floor of See House presents a view of the solar data collected using dials, line charts and a thermometer for temperature. HighCharts.js offers web developers a package of JavaScript-based views. One of which is the VU Meter to the right. Ambitious ACES may wish to have an RGB Cube rotate in response to the motion of a Triple-Axis Gyro/Accelerometer.

Task.

  1. Using two or more sensors of your choosing (and any other components), imagine and develop an interesting MVC application that integrates Arduino with Processing to provide a compelling view of a sampling of real-world analog signals. Note: Arduino and Processing is a two-way street; each can communicate with each other :)
  2. Prepare a new ER entry with the title, Project 3. Analog Sensors and submit your ER to handin no later than midnight November 15 with the email subject line of Analog Sensors.
  3. Be prepared to present your project to your peers in class on either Monday November 16 or Wednesday November 18.

Do your research as soon as possible to allow time for the creativity to flood in.

Video Results

SA, PB, NB, MB, JB, GC, TD, AE, OG, JG, NJ, MK, RK, KL, BL, MM, HM, RM, MP, ST

 


Intersection Simulation. (Since many of you will be taking driving lessons in the near future it's a good time to review the workings of an intersection.) For your first 'common' project you are asked to develop a creative, Arduino based-simulation of an intersection that has, at the least, traffic lights in each of four directions. Your kit has red, yellow, and green LEDs. The simulation includes, of course, both software and hardware assets. Note. There are other features of a real-world intersection that you may wish to consider/investigate/simulate to enhance your Arduino knowledge and skills.

Considerations

Engineering Report. Insert a page break at the end of your current ER, add TEI3M - Arduino centered on the page, and add a second page break before beginning your Intersection Simulation writeup for this project. Submit to handin by midnight, Sunday October 4. with the Subject Line: Intersection.

You will have 5 minutes to present your project to your peers on Tuesday October 6 and Thursday October 8.


- Blink Variations. Modify the Blink sketch as required to accomplish each of the following progressively-challenging tasks. You are expected to write great code; the internet offers than enough bad code already; don't add to the supply.

Great code is beautiful and as much Art as it is Science.
It is a tough, time-consuming and profoundly satisfying
pursuit.
Do not be satisfied with code that simply works.

  1. Without modifying the Blink sketch, insert an LED from your kit into the Arduino's female header in such a way as to parallel the oscillation of the onboard, surface-mount LED.
  2. Modify the Blink sketch so that the programmer only has to change one statement to have the oscillation occur on a different digital pin. Test with the support of external parts from your kit.
  3. The standard Blink sketch provides a 50% duty cycle on pin 13 (HIGH half the time). Modify the code from Step 2 to allow the programmer to affect the duty cycle of oscillation by changing one statement, only.
  4. In your kit you'll find a red/green bicolor LED. Rather than simply having a standard LED turn on, then off, on pin 13, add the simplest of external circuitry using parts from your kit to have the bicolor LED oscillate continuously between red and green using the standard, unmodified, Blink sketch. Note: It may seem that the Arduino has more than enough pins for your projects, but you'll soon realize this is not necessarily the case. Developing the ability to 'do more with less' will pay significant dividends in future projects.

Design Challenge 1 (ER). This report is a summary of your efforts to design a unique box (case and top) to house a circuit soldered to a perma-proto board from Adafruit using ViaCAD 2D/3D v10. Sections will include: Purpose, Reference, Acknowledgments, Procedure, Media and Conclusion. Mr. Paul Elia provided the instruction, with video and design support, Kreher Fiset-Algarvio and Darius Dadyburjor printed your cases and the acrylic tops were outsourced to Sawdust&Noise.


Design Challenge 1. For your next challenge you are asked to design and produce a prototype of a case that ACES (and possibly the wider maker world) can use to house their perma-proto circuits. The best three cases will earn bonus credit on their designer's TEI3M final mark to be credited in June. Final judging of the cases will be undertaken by Grade 10 & 12 ACES, ACES' Alumni, along with Mr. Elia and myself. Thirty units of the winning case will be produced and sold in the Dragon's Lair, at cost. Also, I will send Adafruit a description of the project and, with any luck, they will feature your work as they did with our 50th Anniversary Clock Project from two years ago on their blog.

While you are encouraged to dream, imagine, and create something unique, the ultimate case will be judged on a number of criteria as described below.

  1. Cost. Since the case will be sold with a perma-proto half board ($6.00), heat set inserts ($0.80/pc) and M3 screws ($0.40/pc), the base cost of a case with 6 fastening points is already up to $13.20 before you even get started. Before you say that perhaps the case should be sold without the additional hardware, think of the time and trouble the users will have to go through to source and purchase these parts themselves. The reality is these costs are unavoidable and must be considered by all entrepreneurs.
  2. Versatility, Ease of Assembly and Use. Your design should take into account possible access points for power, switches, venting, etc from both the sides and the top. Since the cost of the screws and inserts are substantial, your design should factor in how a minimum number of them holds the ENTIRE structure together. Can your box be repurposed for a future circuit? If it can, it makes the initial outlay of $20 easier to accept.
  3. Durability. Will your design stand up to the drop test? Is it waterproof so it can be used outdoors?
  4. Esthetics. Your case must have the text RSGC ACES, the RSGC ACES Logo and your name embossed in a conspicuous location and and attractive font. You may even want to add a catchy name for your creation and add it to either the side or have etched in the acrylic. A coloured body and complimentary-coloured acrylic top add to its desirability. Smoothed corners and edges and if convenient to work with.

You are asked to develop TWO separate ViaCAD files,

  1. One for the 3D case body (entitled XXXXXXCase.vc3 where XXXXXX is your surname), and,
  2. One for the 2D acrylic case top (entitled XXXXXXTop.vc3)

You are to attach these two files to an email to handin by Saturday November 18.


Digital and Analog: Reading and Writing. The presence of pedestrians or a longer-than-usual line of vehicles waiting to turn left are two situations that can influence the normal cyclic operation of a Traffic Light. at an intersection.

Task. In this followup to the previous project, you are afforded creative license to employ at least one example each of digital and analog, reading and writing, (four combinations) in a continuous simulation of your single Traffic Light. Since we've already employed appropriate digital and analog write statements, the latter being apply a PWM signal to dull the red LED, your challenge is to embed additional digital and analog read statements to make the simulation even more realistic and responsive.

The credit you receive for this submission will be based, in part, on your creativity and originality. For example, we used a potentiometer in class on Thursday, acting as a simple voltage divider, to demonstrate the use of the analogRead() statement. On the other hand, a variety of sensors exist (that are more intersection-appropriate) that either produce varying voltages themselves or can be used in conjunction with other resistive components to divide voltage. If you get an early jump on this two-week assignment you can easily secure these devices!

Include the standard Reference, Procedure, Code, Media and Conclusion subsections. Finally, your video should clearly explain your use of the four requirements (digital and analog; reading and writing).


Traffic Light Assembly and Testing. After inserting a divider page in your ER indicating the start of this course, TEI3M, begin this year's submissions with a report entitled, Traffic Light Assembly and Testing. The focus of this first summary is the soldering of the device and simple testing. For the assembly aspect of this project you will document your soldering of the device through media acquisition that you can include in your report. For the testing aspect, you will include media as well as a simple sketch based on the Blink sketch that we will explain in class on Tuesday and Thursday.

In your report, include the sections Purpose, Reference, Procedure, Code, Media, and Conclusion in Heading 2 style. A full Parts Table should appear right-aligned within the Procedure section. The schematic and board graphics of Jasper's PCB appear below and should be edited as you see fit and strategically embedded within your report.

Schematic Board Layout