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Download Thermostat Circuit Worksheet
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Name: ______________________________________________ Date: __________________ Thermostat Circuit Worksheet Part 1 — Build a thermostat from a circuit diagram or pictures. Use the circuit diagram in Figure 1 (below) to create a thermostat on your breadboard. Figure 1: Circuit diagram for thermostat. Energy-Efficient Housing: Lesson 2, Thermostat Activity — Thermostat Circuit Worksheet 1 Table 1 Circuit components in the circuit diagram. Component Power source Temperature sensor (transistor) Operational amplifier Resistor 1 Resistor 2 Resistor 3 Resistor 4 LED Part Number / Value 9 Volt battery LM35 LM324 22000 Ω 470000 Ω 100000 Ω 1500 Ω 1.8V/20mA Part 2 — Circuit check After building the circuit do a few quick checks to make sure that the circuit is properly assembled. 1. First, connect the battery terminals via wires to the breadboard power and ground rows. Look to see: Are any of the components smoking and/or getting extremely hot? 2. Next, use the multimeter to check the output of the temperature sensor. Since the temperature sensor should be at or about room temperature, the output should be reading about 210-310 mV, depending on the temperature in your room. Energy-Efficient Housing: Lesson 2, Thermostat Activity — Thermostat Circuit Worksheet 2 If the voltage is above 200 the LED should be off If the LED is on, one or more of your resistances is incorrect or in the wrong place. Double-check the resistor placements and values found in Figure 1 and Table 1 respectively. If the voltage is below 200 the LED should be on If the LED is not on, one or more of your resistances is incorrect or in the wrong place. Double-check the resistor placements and values found in Figure 1 and Table 1 respectively. 3. If all of these steps check out, there is a good chance your circuit is working properly! Part 3 — Modeling the circuit (data recording) 1. After connecting the battery to the circuit, what is the measured value of the output voltage of the temperature sensor as shown above? _______ 2. What temperature does this voltage equate to if the temperature sensor has an output of 10mV/°C? Divide the voltage by 10. a. Example 260mV = 26 °C b. _______________________________________________ 3. Using a bag of ice to cool the sensor, what is the measured value of the output voltage as soon as the LED turns on? ________ 4. What temperature does this voltage equate to? _____________________________ 5. Using heat from your fingers, what is the measured value of the output voltage as soon as the LED turns off? _________ 6. What temperature does this voltage equate to? _____________________________ Energy-Efficient Housing: Lesson 2, Thermostat Activity — Thermostat Circuit Worksheet 3