ELECTRICAL ENGINEERING TECHNOLOGY PROGRAM EET 331 – ELECTRONIC DESIGN LABORATORY EXPERIENCES LABORATORY EXPERIENCE: ELECTRONIC THERMOMETER SECTION 1: Design the circuit Using a LM34 as a temperature sensor, Operational Amplifiers and passive components, design an electronic thermometer with the following specifications: - Two simultaneous temperature outputs: Degrees Fahrenheit and Degree Celsius. - For either output, the decimal point in the voltage read should correspond to the decimal temperature. For example, a voltage reading for 44.5 should indicate a temperature of 44.5 ˚F or 44.5 ˚C. - The electronic thermometer has to allow for positive and negative temperatures. ELECTRONIC THERMOMETER Temp. ˚F Temp. ˚C There are different options to design each one of the necessary stages. Discuss them and defend your choice when writing your laboratory report. Temperature conversions: °F = (°C × 1.8) + 32 °C = (°F − 32) /1.8 SECTION 2: Circuit testing - To verify that your electronic thermometer is working correctly, mix hot and cold water in order to produce different temperatures. - Use a reasonable number of different temperatures within the range of temperatures that you can easily obtain. EET 331 – Electronic Thermometer 1/2EET 331 – Electronic Thermometer 2/2 - Carefully submerge the body of the temperature sensor making sure that the water does not shortcircuit the electric leads. - Compare the readings obtained in your thermometer with the readings from the thermometer provided by the instructor. You can create a table similar to the one below in which row corresponds to a different mixture of cold and hot water (feel free to modify): Temp. reference thermometer (degrees C) Temp. reference thermometer (degrees F) Temp. electronic thermometer (degrees C) Temp. electronic thermometer (degrees F) % error degrees C % error degrees F In your lab report, plot the temperatures obtained versus the temperature measured with the reference thermometer. Explain any discrepancies that you may observe. SECTION 4. Laboratory report - Create an individual lab report using the guidelines provided in the course’s website. Include all the information that you believe is necessary. - Once again, please comment on the difficulties and challenges of this laboratory work (i.e. what worked, what did not work, what you liked, what you didn’t like, etc.). Be assured that the grade for your laboratory work or your course will not be affected at all by your positive or negative comments. - Comment on the benefits and problems of using these new devices that we have studied in this