Difference between revisions of "Week 3 Lab"
From Robert-Depot
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* Q: How can you verify your guess? (... I have two ideas ... ) | * Q: How can you verify your guess? (... I have two ideas ... ) | ||
=== other loads === | === other loads === | ||
| + | ==== photoresistor ==== | ||
* photoresistor from your 147A kit... 160k - ~10k (depending on your lighting conditions). | * photoresistor from your 147A kit... 160k - ~10k (depending on your lighting conditions). | ||
* Q: With the same 10k resistor from the schematic above, what range of voltages (and corresponding data values) would you expect to see with this? | * Q: With the same 10k resistor from the schematic above, what range of voltages (and corresponding data values) would you expect to see with this? | ||
| − | + | ==== strain gauge ==== | |
| − | + | ||
| + | ==== ultrasonic rangefinder ==== | ||
== Analog Output == | == Analog Output == | ||
Revision as of 22:11, 12 April 2009
from Electronic Technologies for Art
Contents
Analog Input
- File->Sketchbook->Analog->AnalogInput
Potentiometer
- Q: What will the voltage at A_IN be? What are the upper and lower values?
- The important part of this sketch is the line where the microprocessor reads the analog input:
val = analogRead(potPin); // read the value from the sensor
- Q: Looking at the Arduino help for that function (
analogRead()), what do you think the valuevalwill be for those highest and lowest voltages at V_IN? - Q: How can you verify your guess? (... I have two ideas ... )
other loads
photoresistor
- photoresistor from your 147A kit... 160k - ~10k (depending on your lighting conditions).
- Q: With the same 10k resistor from the schematic above, what range of voltages (and corresponding data values) would you expect to see with this?
strain gauge
ultrasonic rangefinder
Analog Output
LED Dimming
- File->Sketchbook->Examples->Analog->Fading
analogWrite(ledpin, value); // sets the value (range from 0 to 255)
PWM (pulse width modulation)
- lights, fading
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Motor Speed Control
- Basic motor control (DC motors) see week 5
Sound, Tone Generation
- sounds, tone generation
