Code Club Electronics 8

So following on from the previous post. I had to look this up to remind myself how to specific a pin. Not used Arduino in a while. I found the following code as part of a stackoverflow post

However, in this, the two LEDs flash on and off alternately. Delay is set by a single line.

int delayPeriod = 1000;

So this is more so I can learn how to specify a pin.

int ledPin = 12;
int ledPin2 = 13;
int delayPeriod = 1000;

void setup()
{
  pinMode(ledPin, OUTPUT);
  pinMode(ledPin2, OUTPUT);
}

void loop()
{
  digitalWrite(ledPin, HIGH);
  digitalWrite(ledPin2,LOW);
  delay(delayPeriod);
  digitalWrite(ledPin2, HIGH);
  digitalWrite(ledPin,LOW);
  delay(delayPeriod);
  //delayPeriod = delayPeriod - 10;
}

In the video, I am just changing a single line of code to cause the delay.

Timings are in milliseconds or seconds

Links

• Easy module shield

Tags

#Electronics,#Code,#Arduino,#Hacking.#LED,#Blink

Code Club Electronics 7

Just having a look at an Arduino add-on board, that has various inputs and outputs built in. The following code (from the default IDE library) flashes an LED on and off. The delays can be changed within the code.

/*
  Blink

  Turns an LED on for one second, then off for one second, repeatedly.

  Most Arduinos have an on-board LED you can control. On the UNO, MEGA and ZERO
  it is attached to digital pin 13, on MKR1000 on pin 6. LED_BUILTIN is set to
  the correct LED pin independent of which board is used.
  If you want to know what pin the on-board LED is connected to on your Arduino
  model, check the Technical Specs of your board at:
  https://www.arduino.cc/en/Main/Products

  modified 8 May 2014
  by Scott Fitzgerald
  modified 2 Sep 2016
  by Arturo Guadalupi
  modified 8 Sep 2016
  by Colby Newman

  This example code is in the public domain.

  https://www.arduino.cc/en/Tutorial/BuiltInExamples/Blink
*/

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
}



// the loop function runs over and over again forever
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(100);                       // wait for 100 milli seconds
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(100);                       // wait for 250 milli seconds
}

The video just shows the last section of code and what happens when the delay is changed.

Timings are in milliseconds or seconds

e.g. 1000 ms = 1 second 2000 ms = 2 seconds 100 ms = 0.1 seconds 250ms = 0.250 seconds (¼ second) 500ms = 0.500 seconds (½ second)

Links

• Easy module shield

Tags

#Electronics,#Code,#Arduino,#Hacking.#LED,#Blink