02 / In class : Language and Operators

Comparion Operators VS Boolean Operators

Language Reference (more info)

Comparison Operators : The system only looks for a yes or no answer ( TRUE (1) & FALSE (2))

IF statement

One condition :

if (someCondition) { // do stuff if the condition is true } else { // do stuff if the condition is false }

Multiple layers of conditions :

if (someCondition) { // do stuff if the condition is true } else if (anotherCondition) { // do stuff only if the first condition is false // and the second condition is true }

** Caution

= (one equal sign) Assignment

== (two equal signs) Equal to

Boolean operators :

&& And

ll Or

For Statement

Variable : When to start

Test : For how long

Increment : How it change overtime

SensorValue++ // mean SensorValue +1

fadeValue+=5 // tell a specific increment

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Each pin port capability.

Digital Read : All

Digital Write : All

Analog Read : A0-A5 ( only analyze 0-1023)

Analog Write : 3,5,6,9,10,11 (only analyze 0-255 (Full brightness))

For example :

when we applied "Fade", we used pin no.9 instead of no.13 because pin no.13 can't do analog write.

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"AnalogInput"

void setup() {

// declare the ledPin as an OUTPUT:

pinMode(ledPin, OUTPUT);

}

void loop() {

// read the value from the sensor:

sensorValue = analogRead(sensorPin);

// turn the ledPin on

if (sensorValue >=500) {

digitalWrite(ledPin, HIGH);}

// stop the program for <sensorValue> milliseconds:

delay(sensorValue);

// turn the ledPin off:

digitalWrite(ledPin, LOW);

// stop the program for for <sensorValue> milliseconds:

delay(sensorValue);

}

// Debug //

Problem The light only was on once!

Hypothesis I added the if statement in a wrong position, in the void setup.

Result If statement needed to be added between void loop so that it will active constantly!

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