Digital 5 Homework

The homework has two parts:

Capture the schematic for a circuit from a diagram. Details below.
Post a comment to this entry with a half-page proposal that outlines what you are thinking about doing for the class project. Here are some basic guidelines:
- We don’t expect this to be a description of the “how,” but rather the “what”. If you want to talk about why, or discuss more, I will be available during office hours or my appointment.
- You should incorporate at least 2 of the 4 segments that we’re covering in class: analog, digital, mechatronics, and materials.
- If you are not taking all sections, please post based on what you are taking. Your requirements will scale to the number of sections taken (which for most of you is “all of them”).
- We expect you to show your accomplishment, and then challenge yourself slightly. If you’ve come to office hours or talked to us, we have some idea of how much you know coming in. What we’re hoping to see is how you have grown through this class.

Office hours will be Monday starting at 5pm.

Schematic Capture

The circuit given here is a 16×16 wireless keypad. It uses an ATmega168, a variant of the chip you are using now.

homework 5 schematic (PNG, easier to read)

homework 5 schematic (PDF)

homework 5 partial schematic (update Sunday night to include antenna symbol)

Frames Library for class (Added Sunday for those who don’t have arrow symbols in frames.lbr)

You are to recreate what’s shown in the schematic (PNG and PDF above). You don’t have to create a 1:1 replica. Incread, use your own sense of the circuit, but make sure the electrical connections are the same. To make life easier, I have provided a schematic with some of the more difficult parts already added. Use that as a base if you want. Some other notes:

All resistors and capacitors should be 0805 package
The atmega168 must be the TQFP package (NOT the DIP package that you’re using)
Use the supply1 library for power and ground symbols
You can use a 1×1 pin header (pinhead library) for antenna (ANT) if you want
IC1P is the power circuit of IC1. Use the invoke tool on a piece of IC1 to get to it.
I have posted a frames library that does contain the extra arrow symbols (since it seems the freeware may not contain it…). Let me know if this one works out.
There is a note provided on how to make the “signal symbols”. They is done in 4 steps:
1. Draw a wire with the “net” tool.
2. Give the wire a meaningful name with the “name” tool.
3. Use the “label” tool to grab the name and place it next to the wire. Remember to rotate the text so that the cross that marks the text movement point is close to the wire rather than far from it.
4. Use the “add” tool, select the “frames” library, and from there select one of the arrow shapes that fits the text.

We will be working on routing a copy of this schematic in class on Tuesday.

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Published:: 10.18.08 / 1pm

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3/6/9/12H, TR 9:30-11:30am, Room E15-235

Techniques for Design and Fabrication is course that focuses on the realistic challenges of designing and building with technology, as well as the basic theory underlying how such systems work. The intent is to provide students with practical skills in electronics, fabrication, mechatronics, and materials selection and production, and is tailored to the requirements of the work done at the Media Lab. Rather than focusing on the low level workings of the tools used, we will point out at practical concerns and underlying rationale that drive the implementation and production of working prototypes and demos.

Elly 10.20.08 / 5pm

For my final project, I would like to create a handheld object that can react to different qualities of touch on its surface. The user will attempt to convey emotions through their touch, ideally resulting in very different qualities of touch on this object. This object can then be used in formats such as theatrical performance as a tangible interface for expressing, projecting, and controlling some aspects of the user’s desired emotional content.

This project will primarily use material from the digital and analog electronics sections of Techniques for Design and Fabrication, as those are the only sections that I am taking. My handheld object will contain force sensors, possibly multiple kinds of force sensors and other materials that change resistance with pressure, that can be used to measure both how tightly the object is being held and where the user’s hand is on the object. The output from these sensors may need some analog filtering to remove extraneous noise.

Data from the sensors will be processed in the micro-controller, with different combinations of force and hand placement mapped to different categories of touch. I will use LEDs or other visual elements to represent these different categories. For instance, the brightness of each LED could vary depending on how strongly the current sensor data matches the quality of touch represented by that LED.

Steffen 10.20.08 / 6pm

Hi,

I have two ideas for projects. Both are focused on using bi-metal stripes.

1. Lobster Robot Leg:
Lobsters have interesting legs using extrieur skeleton. Using the newest 3D-Printing techniques it should be possible to design and produce a very similar system.
Bi-metal stripes should function as muscles.

2. Tiny Spider Robot:
I can image about a designing a very tiny autarkic robot with small bi-metal stripes as legs. Maybe it is also possible to apply a kind of sensor to object to give the robot changing input.

Because we have not yet had the material and fabrication section, it is quite difficult to assess the projects.

Robin 10.20.08 / 7pm

For my final project I would like to attempt to build a plotter that prints via pen or pencil or possibly a variety of utensils.

I am less interested in the precision machining of parts in order to achieve the most accurate printing quality (in fact the imperfections of the print are what interest me). But I would like to focus more on the problem of how to communicate to this machine to print a different kinds of information. I hope to tackle issues like edge detection, registration, vector lines, possibly more complex shapes (hopefully a diagonal line, possibly a curve). Or perhaps this machine simply controls a Spirograph or Etchasketch. I see the project as an opportunity for me to work out the fundamentals of this machine and the knowledge to develop it over time.

This project should incorporate both electronics sections as well as mechatronics section. I am taking these three sections for credit but would like to sit in on the materials portion of the class.

Skylar Tibbits 10.20.08 / 8pm

My project will look at kinetic structures through a small-scale prototype that should reconfigure based on user interaction. Low-level control will be applied to each joint and will react based on local conditions. Specific joints should be constrained in movement while others are free to rotate along varying axis. A complex system of movement should be possible from congruent local systems of constraint and freedom.

The digital electronics, mechatronics and smart material sections of the Techniques class will be utilized for this proposal. Input may be taken from user interaction and/or global conditions. Possibilities include: location (pressure sensor), environment (thermistor, light sensors), local forces (wind & user forces on the system) etc. The input will be computed through the microcontroller and linked with motors that allow or restrict joint movement.

Santiago Alfaro 10.20.08 / 9pm

Good evening.

I’m interested in movement and in optical flow (the recognition of movement by comparing images at different times).

So I would like to combine these two. Maybe with a small car that as it moves it scans the surface on which it is moving and then sends that information to a second object that would react according to that information.

The use of accelerometers might also be an interesting way to achieve this.

Alex 10.20.08 / 9pm

My project will consist of drumsticks that detect what they are being struck against. I will be using microphones / piezoelectric elements to detect the frequency of the stick. This will then be processed and the resulting waveform will be used to determine the instrument to simulate.

Laura 10.20.08 / 10pm

I’d like to build a time-keeping ball that is responsive to the user’s motion and to its being rolled on the ground. The ball should function as a clock when at rest (its hands driven by motors) and when it senses movement, I’d like it to stop time. While it is responding to motion, it blinks a light to let the user know that it’s stopping time. When it goes back into its regular state, I would like it to speed up momentarily to “catch up” for lost time. The ball will also be able to be mounted on the wall as a clock that responds to its surroundings.

Daniel Leithinger 10.21.08 / 8am

I have gathered a bunch of broken harddrives and want to convert them to a clock and/or calender. The inspiration comes from the “Harddisk-Uhr” (http://gadgets.boingboing.net/2007/09/17/harddiscuhr-best-hdd.html) and various LED based HD clocks (http://www.ian.org/HD-Clock/). If possible, I want to use the original HDD motors, if not I will use servos. I thought of a combination of the two clocks cited above. The clock will show the time like the one in the first project and start spinning and go haywire with LEDs at a preset alarm time like the second one. The spinning disc could also create some awakening noises.

Adela Kalenja 10.21.08 / 8am

I’m interested in designing a complex surface composed of interconnected panels which have build in movement in them. The panels should sense when a human hand stands above them and move accordingly as the hand slides above the surface. Attention will be given to the material chosen for the panels.

Mark Watabe 10.21.08 / 8am

For my final project I want to build the first prototype of my dream of a rock sorting/printer. I would like to someday make a rock garden in which the size of the rocks gradually fluctuates across the field to create a sense that there are underlying forces determining the placement of the rocks. For now I would like to make a small ‘printer’ that places some unit (for example I could use 1/8″, 3/16″, and 1/4″ basswood cubes) on a table top according to a specified ‘map’ of the distribution of elements.

Right now I imagine it being somewhat like a laser cutter without the laser, but perhaps it would be easier to have a radial arm that drops the cubes. The mechanism that takes and drops one cube might be something I could hack if I could find the right part…

Then I also have to sense the weight of objects (I would prefer to do it by volume, but this seems much more difficult) and tell whatever mechanism to go to some point and drop the object.

Ryan O'Toole 10.21.08 / 9am

hello,

I’m taking the digital and materials sections. Here is my idea:

Fab the board and housing for the Telit 863 chip + controller + microphone + misc. components.

The Telit chip offers the feature set of a modern internet enabled cell phone. I plan on deploying my unit into the sublime / secret / natural world, where it can be called and listened to anonymously.

Keywon Chung 10.21.08 / 11am

Choice, choices…

1. Tea cup with a variable coaster
Coaster changes size and shape, shrinking in size and increasing its height as the tea cools down, making you nervous and want to keep the tea warm.

2. Wings shoes
Shoes that unfold wings when you run — either electro-mechanically using shape memory alloy (?), or displays how much you’ve walked using electroluminescent material.

Ana 10.21.08 / 2pm

I am planning to build a soft gel wristband with embedded pressure sensors.
When users squeeze it, it should send a signal to a bluetooth device. I’d like to use it as an input interface.

Wei Dong 10.21.08 / 10pm

Two possible projects,

1. Sunflower: to build something can follow the direction of environmental lightening like a sunflower (analog, digital, and mechatronics).
2. A ring: a ring can change it color according to the change of heart bit (analog, digital, and material)

I prefer to go with the second one. :p

Josh Levinger 11.13.08 / 12pm

My final project is a personal locator and location-aware feedback tool. The implementation I have in mind is a tracker for sex offenders who are barred from getting close to areas where children congregate. However, a simple switch of the locations and distance parameters could make it suitable for a wide range of different location based problems.

I’m using the Telit 863-GPS board to get the current location, parse the GPS sentence, and inform the wearer (via vibration) that they are within a predefined distance from one of a set of stored waypoints. The current location is also sent to via SMS for display on a website. Because there is a python interpreter onboard, the microcontroller aspect is not as low level as using an Atmega, but is certainly easier for the programmer. The analog portion involves a mobile power supply, serial level conversion, and a driver for visual and tactile feedback. The mechatronic portion will involve building a wearable, reasonably weatherproof case.

Keywon Chung 11.17.08 / 2pm

I have an updated project idea called “Sculpt-a-Light”
Click for description.

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