• syntax highlighting
• command-line arduino interface
• org-mode babel support

Upload

In Arduino source code file, press [C-c C-c] to upload to Arduino board.

Build

In Arduino source code file, press [C-c C-v] to build.

use with package company-arduino to get Arduino code completing.

(require 'flycheck-arduino)
(add-hook 'arduino-mode-hook #'flycheck-arduino-setup)

You need have Org-mode installed, ob-arduino.el is in arduino-mode by default now.

(require 'ob-arduino)
(add-to-list 'org-babel-load-languages '(arduino . t))
(org-babel-do-load-languages 'org-babel-load-languages org-babel-load-languages)

Like the following src block, press [C-c C-c] to upload to Arduino board.

#+begin_src arduino
// 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 0.1 second
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(100);                       // wait for 0.1 second
}
#+end_src