Sketches from "Introduction To Arduino" sessions

[Paul Beard]

From session on 16/2/2016 on reading switches & pushbuttons and making beeps:

#define swtch 4
#define spk 3

int count = 0;
int countPrev = 0;
int swPrev = HIGH;

void setup() {
  pinMode(swtch, INPUT_PULLUP);
  Serial.begin(9600);
}

void loop() {
  int swNow = digitalRead(swtch);

  if (swNow == LOW && swPrev == HIGH) {
    count++;
    tone(spk, count * 100, 250);
    if (count >= 21) count = 0;
    delay(250);
  }

  swPrev = swNow;
 
  if (count != countPrev) Serial.println(count);
 
  countPrev = count;
 
}

[Paul Beard]

From session on 2/2/2016 on LEDs etc:

#define red 5
#define amber 3
#define green 6


void setup() {
  // put your setup code here, to run once:
  pinMode(red, OUTPUT);
  pinMode(amber, OUTPUT);
  pinMode(green, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(red, HIGH);
  delay(5000);
  digitalWrite(amber, HIGH);
  delay(1000);
  digitalWrite(green, HIGH);
  digitalWrite(amber, LOW);
  digitalWrite(red, LOW);
  delay(5000);
  digitalWrite(green, LOW);
  digitalWrite(amber, HIGH);
  delay(1000);
  digitalWrite(amber, LOW);

 
}