130-28176 Parallax Inc, 130-28176 Datasheet - Page 188

• Manufacturer Part Number: 130-28176
• Description: KIT PARTS PROCESS CONTROL
• Manufacturer: Parallax Inc

Specifications of 130-28176

• Accessory Type: Education Kit
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• For Use With/related Products: Board of Education Full Kit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

Part B:
Challenge 5-3 Solution
Part A:
By changing the value of R
draw.
Part B:
Challenge 5-5 Solution
With a 4.7 kΩ value of R
1. With the simulated delay of 2 seconds, the fan slows noticeably, or almost stops,
2. The simulated delay should occur after measuring and plotting the speed, just
1. 5 τ = 1.1(100 kΩ)(0.68 µF) = 0.0374 seconds
2. No. It would require:
before the RPM is measured.
prior to
1 τ = 1.1(100 kΩ)(0.68 µF) = 0.0748 seconds
5 τ = 5 (0.0748 Seconds) = 0.374 seconds = Discharge time
5 x 1.1(1 MΩ)(0.68 µF) = 3.74 seconds
a. Gain = 1+R
b. Maximum output: At capacitor: 5 V out with 255 PWM Value.
c. For PWM value of 25:
d. Output step resolution: = 7.35 V/255 = 0.0288 V
e. %Resolution is still 0.392% since the number of steps is still 255.
Output of Op-Amp = V
25/255 x 7.35 V = 0.72 V
LOOP
for best control and monitoring.
f
/R
f
:
i
L
= 1 + 4.7 kΩ/10 kΩ = 1.47
to 100 kΩ, the discharge will be faster due to higher current
I
(Av) = 5 V(1.47) = 7.35 V