Difference between revisions of "Week 3 Lab"
From Robert-Depot
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from [[Electronic Technologies for Art]] | from [[Electronic Technologies for Art]] | ||
| − | + | == Analog Output == | |
| + | === LED Dimming === | ||
| + | *File->Sketchbook->Examples->Analog->Fading | ||
| + | <code> | ||
| + | analogWrite(ledpin, value); // sets the value (range from 0 to 255) | ||
| + | </code> | ||
| + | PWM (pulse width modulation) | ||
| + | *lights, fading | ||
| + | <youtube v="62gWVWCyw_w" loop="true"/> | ||
== Analog Input == | == Analog Input == | ||
| + | * now... driving it with input data, instead of with a loop. | ||
* File->Sketchbook->Analog->AnalogInput | * File->Sketchbook->Analog->AnalogInput | ||
=== Potentiometer === | === Potentiometer === | ||
| Line 24: | Line 33: | ||
==== ultrasonic rangefinder ==== | ==== ultrasonic rangefinder ==== | ||
| − | == Analog Output == | + | |
| − | + | == Analog Output, Again == | |
| − | + | Other things you can control. | |
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=== Motor Speed Control === | === Motor Speed Control === | ||
Revision as of 22:20, 12 April 2009
from Electronic Technologies for Art
Contents
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"/>
Analog Input
- now... driving it with input data, instead of with a loop.
- File->Sketchbook->Analog->AnalogInput
Potentiometer
- A_IN can be any of the Analog pins (0-5) on your Freeduino.
- 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 your A_IN pin? - Q: How can you verify your guess? Try and verify your values, in some way. Anything goes!!!
other loads
photoresistor
- taking the photoresistor from your 147A kit, it has a resistance of ~160k - ~10k (depending on your lighting conditions)
- Q: With the same R2 resistor (10k) from above, replacing R1 with the photoresistor, what range of voltages (and corresponding data values) would you expect to see at your A_IN pin?
- Q: Using methods you invented above, verify your data readings.
strain gauge
ultrasonic rangefinder
Analog Output, Again
Other things you can control.
Motor Speed Control
- Basic motor control (DC motors) see week 5
Sound, Tone Generation
- sounds, tone generation
