Difference between revisions of "Week 3 Lab"
From Robert-Depot
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== Analog Input == | == Analog Input == | ||
* File->Sketchbook->Analog->AnalogInput | * File->Sketchbook->Analog->AnalogInput | ||
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* Potentiometer | * Potentiometer | ||
[[Image:Pot_in.png]] | [[Image:Pot_in.png]] | ||
* Q: What will the voltage at A_IN be? What are the upper and lower values? | * Q: What will the voltage at A_IN be? What are the upper and lower values? | ||
| − | * Q: Looking at the Arduino help for | + | * The important part of this sketch is the line where the microprocessor reads the analog input: |
| − | + | <code> | |
| + | val = analogRead(potPin); // read the value from the sensor | ||
| + | </code> | ||
| + | * Q: Looking at the Arduino help for that function (<code>analogRead()</code>), what do you think the value <code>val</code> will be for those highest and lowest voltages in the previous question? | ||
| + | * Q: How can you verify your idea? | ||
| + | === other loads === | ||
* 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? | ||
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* strain gauge | * strain gauge | ||
| + | * ultrasonic rangefinder: | ||
== Analog Output == | == Analog Output == | ||
Revision as of 22:09, 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 in the previous question? - Q: How can you verify your idea?
other loads
- 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
<youtube v="62gWVWCyw_w" loop="true"/>
Motor Speed Control
- Basic motor control (DC motors) see week 5
Sound, Tone Generation
- sounds, tone generation
