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ECE 3300 Lab 2 ECE 1250 Lab 8 – Sensor System Name ______________________ Lab Section ___ Homework Folder # ____ Invent a Sensor System Background: In previous labs and homework, you have learned to design and use: Simulation software (Multisim) Electrical test equipment o DMM (digital multimeter) to measure V,I,R (on your MyDAQ) o Oscilloscope to measure V as a function of time (on your MyDAQ) o LED indicators for output voltage (see Labs 1 and 2) DC sources (from the MyDAQ) and AC sources (the function generator on your MyDAQ) Resistive sensors o Potentiometers (for tuning) o Thermistor (for temperature) o Light sensor o Moisture sensor (the home made resistor you created) Capacitive sensors o Any way you can physically change permittivity, area, or distance … Op Amp amplifiers, summers, difference amp, buffer (voltage follower) Digital circuits (only very brief experience, but these are available for you to use as well) Block diagram approach to designing circuits (‘deck of cards’) Step-by-Step Instructions: The Lab 4 ‘extra credit’ section (see p9 of Lab 4) has a step-by-step description of how to design a simple resistive sensor system. There are also a number of places on the internet you can find circuits of all kinds. It is ok to use these resources, however you still need to go through, explain, and write up your design process. References: INCLUDE REFERENCES FOR ALL SOURCES YOU USE TO DESIGN YOUR CIRCUIT. It is appropriately professional to give credit for ideas or information you use from someone else, and you or someone else are likely to want to go back to find them again in the future. Please use the IEEE Reference format which is typically used for electrical engineering reports and papers world-wide: http://www.ieee.org/documents/ieeecitationref.pdf Overview: In this lab you will: Invent a sensor system: Design, simulate, and build a sensor system of your own devising. Build the circuit to have this sensor sense something in the environment and then DO something. It can turn on a light, motor, or buzzer, for instance. 1 UNIVERSITY OF UTAH DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING 50 S. Central Campus Dr | Salt Lake City, UT 84112-9206 | Phone: (801) 581-6941 | Fax: (801) 581-5281 | www.ece.utah.edu ECE 3300 LAB 8 Week 1: Preliminary Design Review (PDR) NOTE: For safety, your system must stay within the limits of the MyDAQ voltages and currents. Choose an R or C sensor to sense some aspect of the physical world (for example, moisture, temperature, light, etc.). Decide what your sensor is going to do (turn on a light when the temperature gets too high, for instance). Design the block diagram for your sensor. Describe in reasonable detail what you are going to build, and what will be needed to build it. Order any unusual parts needed for your system. For instance, the reference material on the lab site lists sources for many different types of sensors available. Or you might choose to use a buzzer or small DC motor instead of an LED for the ‘action’ of the system. TURN IN: Preliminary Design Report (PDR): Write up your preliminary design (the information listed above with enough explanation that another student or TA can understand what you are planning to do and how you plan to do it). This should be about 1-2 pages. o Does your report explain what you are doing in sufficient detail the TA or another student can understand it? o Is your block diagram included? o Are any graphs included and labeled (x,y axes, and captions or titles, include units if applicable) o Are any references included, in IEEE format? Preliminary Design Review: Have a TA review your design with you. o Is your design feasible? o Can you do it in the 3-week time frame? Keep it simple. It is always better to ‘promise less and deliver more’. If you have a larger project in mind, carve out a simple section of a bigger project, or do a simple demonstration of the larger project for the purposes of this lab. If you accomplish more than you plan in your PDR, that is fine. o Is your design useful, cool, creative or interesting in some way? Your final project will have an extra 50 points for ‘high cool factor’ if you make it creative, unique, beautiful, useful, or interesting in any way and post a video about your project. o Is your project safe? This class has not yet prepared you to work with higher voltages, so please limit yourself to the voltage and current limits of your MyDAQ. Don’t do anything that ‘plugs into the wall’. Week 2: Critical Design Review (CDR) Design the circuit diagram for your sensor system: Convert the block diagram from week 1 to a circuit diagram for week 2. Specify all components (resistors, capacitors, op amps, etc.) Test your sensor (measure it) to be sure it will work as planned. Test the range of resistance/voltage/current/capacitance/whatever it produces over the range of 2 UNIVERSITY OF UTAH DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING 50 S. Central Campus Dr | Salt Lake City, UT 84112-9206 | Phone: (801) 581-6941 | Fax: (801) 581-5281 | www.ece.utah.edu ECE 3300 LAB 8 environmental parameters you expect it to measure (such as the range of resistance on a thermistor for the temperature range you expect). You will need this range of values for your simulation below. Simulate your sensor with Multisim and be sure it will work as planned. HINT: Circuits have an amazing ability NOT to work the first time. If you just simulate it all together it can be very difficult to debug. Please don’t expect the TAs to look at your full circuit and magically figure out what is going wrong. It is a really really really good idea to build up your system one block at a time, testing each block as you go (in simulation and also later in hardware), so that you catch any mistakes or problems in each small bit of circuitry rather than trying to debug the whole thing at once. HINT2: Keep your simulation as simple as you can. If you are simulating a resistive sensor, for instance, it is Ok to use a potentiometer or to manually change the value of a resistor to emulate the different states of your sensors in the simulation. Check (in simulation) that the voltages and currents within the circuit are within spec for all of the parts you are using. TURN IN: Critical Design Report (CDR): Add the information from your sensor test, system simulation, and check that you will be within spec to the PDR write up you did in week 1. This should be about 2-4 pages. Does your report explain what you are doing in sufficient detail the TA or another student can understand it? Have you included your sensor test data? Is your system diagram included? (Ok to copy from Multisim) Have you included the output from simulation, showing that the system will work as planned? And that it will be within spec for all parts? Are any graphs included and labeled (x,y axes, and captions or titles, include units if applicable) Are any references included, in IEEE format? Critical Design Review (CDR): Demonstrate your simulation to a TA and have them sign off on it. Week 3: Final Design Review (FDR) Build & Test your circuit. HINT: To make this easier to debug, build and test individual circuit blocks separately. Build your circuit up in little pieces, testing as you go. TURN IN: Final Design Report (FDR): Add the information from your final build and test to the CDR write up you did in week 2. This should now be about 4-6 pages. o Include your design and build information, a PHOTO of your circuit, a description and test data for how the circuit performed in the end. o Any graphs should be labeled (x,y axes, and captions or titles, include units) o References should be in IEEE format. Final Design Review (FDR): Demonstrate your working circuit to a TA and have them sign off on it. If you are sensing something that is not easily brought in to the lab, video your demonstration at home/work. Extra Credit (50 points): If your design is useful, cool, beautiful, creative or interesting? Up to 50 points extra credit if you make and post a video about your project (upload to Canvas or include a YouTube link). 3 UNIVERSITY OF UTAH DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING 50 S. Central Campus Dr | Salt Lake City, UT 84112-9206 | Phone: (801) 581-6941 | Fax: (801) 581-5281 | www.ece.utah.edu ECE 3300 LAB 8 Equipment and Parts: The ECE stockroom carries all standard resistors, LEDs (all different colors), capacitors, potentiometers, digital components, etc. I have asked them to order some small buzzers you can use in place of LEDs. Other places you can order special components, additional types of sensors, etc: o Radio Shack o digikey.com o alliedelec.com o jameco.com o newark.com 4 UNIVERSITY OF UTAH DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING 50 S. Central Campus Dr | Salt Lake City, UT 84112-9206 | Phone: (801) 581-6941 | Fax: (801) 581-5281 | www.ece.utah.edu ECE 3300 LAB 8 ECE1250 Invent a Sensor System Cover Sheet Turn this in each week with your report. By the end of the project it will be all filled in. Name _____________________________________ Homework Locker # _______ Lab section ________ Points: Each week’s sign off is worth 50 points. The associated paper you turn in is also worth 50 points. Week 1: Preliminary Design Review (TA sign off : ____________________________) _____ Is your design feasible? _____Can you do it in the 3-week time frame? Keep it simple. It is always better to ‘promise less and deliver more’. If you have a larger project in mind, carve out a simple section of a bigger project, or do a simple demonstration of the larger project for the purposes of this lab. If you accomplish more than you plan in your PDR, that is fine. ______Is your design useful, cool, creative or interesting in some way? Your final project will have an extra 50 points for ‘high cool factor’ if you make it creative, unique, beautiful, useful, or interesting in any way and post a video about your project. ______Is your project safe? This class has not yet prepared you to work with higher voltages, so please limit yourself to the voltage and current limits of your MyDAQ. Don’t do anything that ‘plugs into the wall’. Week 2: Critical Design Review (TA sign off : ______________________________) _____ Sensor test data shows sensor works as planned. _____ Multisim shows system design will work. _____ System design is within spec for all parts. Week 3: Final design Review (TA sign off : ______________________________) _____ System works as planned! OR Video your project working and turn that in. Extra Credit (up to 50 points): If your design is useful, cool, beautiful, creative or interesting? Up to 50 points extra credit if you make and post a video about your project (upload to Canvas or include a YouTube link). Points: Week 1: PDR Week 2: CDR Week 3: FDR Extra Credit Video TA sign off on hardware and/or Write up simulation (above) (out of 50 points) (out of 50 points) (up to 50 points) 5 UNIVERSITY OF UTAH DEPARTMENT OF ELECTRICAL AND COMPUTER ENGINEERING 50 S. Central Campus Dr | Salt Lake City, UT 84112-9206 | Phone: (801) 581-6941 | Fax: (801) 581-5281 | www.ece.utah.edu