Basic Arduino Programming

Notes

• Please note, I am not an expert in this area.
  • I have accomplished every task I wanted to...
  • But I don't know the language fully.
  • And very few nuances.
• The Arduino IDE is a useful way to program.
  • Available here
  • When you install it will
    • Ask for public or single user, just single user
    • Ask for admin permissions, just no on these.
    • Install a bunch of libraries, this is OK.
• You will need to set the board to be Arduino Nano.
• I tend to keep The Language Reference open.
• A first program.
  • Hello world.
  • In the loop routine
    • We need to initialize the serial port
    • Serial.begin(9600);
  • In the main routine

    • static bool firstTime{true};
      if(firstTime ){
          Serial.println("Hello World!");
          firstTime = false;
      }

  • Hit the
    • Check mark icon in the green bar to compile
    • Right Arrow icon in the green bar to compile and download.
  • When I went to run this on my work machine, I had to install the Arduino ESP32 Boards library.
  • When this runs, you may have to click on the magnifying glass on their right side of the green bar to see the serial output.
• The print command has two forms
  • println - print line
  • print
  • Either take zero to two arguments
    • The first is the thing to print.
    • The second is an optional format
      • for integer: DEC, HEX, OCT, BIN
      • For float: decimal places
  • Note the static in the declaration of firstTime
    • remind me what this does.
• Let's blink an led
  • On the variable part of the language reference they provide
    • predefined constants
    • data types
    • And other information.
  • We are interested in the following constants for the next part.
    • LED_BUILTIN refers to one of the built in leds
    • HIGH is a 1 in digital logic
    • Low is a 0 in digital logic
    • INPUT tells the board you will be reading from this pin
    • OUTPUT tells the board you will be writing to this pin
    • We will use other constants later.
  • To write to a digital pin
    • You must configure the pin.
    • pinMode(pin number, usage);
    • For our code, in the setup routine
      • pinMode(LED_BUILTIN, OUTPUT);
    • We will then need to write to it
    • In the loop routine
      • digitalWrite(LED_BUILTIN, HIGH);
      • digitalWrite(LED_BUILTIN, LOW);
    • Since these would blink too fast, add a delay
      • delay(milliseconds);
      • Remind me, what is a millisecond