PJ026: The Dimmable LED with Arduino

Requirement:

• Read the codes as reference, write your own code and make a working result

• Test and analyze how it works by help from serial print

Recap Knowledge (Already Known):

• Serial.begin(speed)

• Serial.print(val)

• Serial.println(val)

Core Knowledge (Must Know):

• analogWrite(pin, value)

Questions:

• What are the min and max value for analogWrite?

• Have we missed pinMode(A0, INPUT)?

Requirement:

• Read the codes as reference, write your own code and fix the red-marks to make a working result

• Test and analyze how it works

Core Knowledge (Must Know):

• analogWrite(pin, value)

• digitalWrite(pin, value)

Questions:

• What is the difference between analogWrite() and digitalWrite()?

• How about replacing line 23 by analogWrite(LED_PIN, 0)?

• How about replacing line 25 by analogWrite(LED_PIN, 255)?

Requirement:

• Based on Task 3, we add another LED, and want to see the 2 LEDs cross-dimming when rotating the potentiometer

• This is a challenging task, without reference codes, please explore and make a working result

Tips:

• Be careful to select PWM compatible digital output pins

• Use map() to map different result ranges

• Use Serial.print() to write helpful debugging logs