Arduino

General

On reset or powerup, ehe Optiboot or other bootloader code is run. If an external reset was the cause, listening mode is entered, and the LED is flashed. Programming commands in STK500 protocol are listened for, of the serial line at 115200 speed. If none are received in a small timeout window (~ 1s), the normal code is executed.

The DTR line if used to trigger a reset in software IDE (see here).

• Duemilanove

millis()

• Useful for timing without using a blocking delay()
• Returns ms in an unsigned long
• Test for 1s (subtraction correctly handles truncation/rollover):
  • millis() - lastCounter > 1000

Documentation

• Arduino Language Reference

Useful Libraries

• Standard Libraries

• FastLED for WS2812B programmable LED strips
  • Code Examples
  • Colour Reference
• FreeRTOS
• LibPrintf
• LiquidCrystal_PCF8574 derived from Liquid Crystal
• OneButton
• Pin Change Interrupt
• TinyGPS

Development Environment

• Visual Studio Code, install Platform.io IDE extension
  • See [https://docs.platformio.org/en/latest/integration/ide/vscode.html#quick-start Quck Start)
• Extension icon -> New Project
  • include - header files
  • lib - libraries
  • src - C++ source files
  • platformio.ini
  • See small icons at bottom for Home, Build, Upload, Serial Monitor

• SHIFT-ALT-F to format document

Platformio.ini

• monitor_speed = 115200