Ch7_Solutions_WAM2.2

Ch7_Solutions_WAM2.2 - WAM v. 2.0 Chapter 7 Questions 1....

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WAM v. 2.0 Chapter 7 Questions 1. What kind of circuit was used to measure the photoresistor? An RC-time circuit. (p. 184) 2. What kind of measurement does the BASIC Stamp perform on this circuit? An RCTIME measurement. (p. 185 – 186) 3. How was the photoresistor test circuit different from the potentiometer test circuit from Chapter # 5? What changes had to be made to the photoresistor test program to get it to work with the new circuit? A different I/O pin was used, and the variable resistor is a photoresistor instead of a potentiometer (p. 185). The pin number had to be changed from 7 to 2. HIGH 7 was changed to HIGH 2 RCTIME 7, 1, time was changed to RCTIME 2, 1, time (p. 185) 4. If the line plotting the photoresistor increases in Stamp Plot Lite, what does that say about the light level being measured? If the value increases, it means the light level decreased. That is, it was getting darker and darker. (p. 187) The photoresistor's resistance increases as light levels decrease. (p. 186)
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Ch7_Solutions_WAM2.2 - WAM v. 2.0 Chapter 7 Questions 1....

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