Arduino: Difference between revisions

Latest revision as of 15:23, 22 August 2025

General

Startup & Programming

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 pulse 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
https://arduino.stackexchange.com/questions/12587/how-can-i-handle-the-millis-rollover/12588#12588

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

Other

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

@@ Line 1: / Line 1: @@
 == General ==
-The [https://github.com/Optiboot/optiboot Optiboot] or other bootloader runs after a reset and looks for a new program to download via RS232. If none is present, the existing one is run. See [https://rheingoldheavy.com/arduino-from-scratch-part-11-atmega328p-dtr-and-reset/ here] for description of the use of DTR.
+=== Startup & Programming ===
+On reset or powerup, ehe [https://github.com/Optiboot/optiboot 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 pulse in software IDE (see [https://rheingoldheavy.com/arduino-from-scratch-part-11-atmega328p-dtr-and-reset/ here]).
 * [https://docs.arduino.cc/retired/boards/arduino-duemilanove/ 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
+* https://arduino.stackexchange.com/questions/12587/how-can-i-handle-the-millis-rollover/12588#12588
 == Documentation ==
@@ Line 12: / Line 24: @@
 * [https://www.arduino.cc/en/Reference/Libraries Standard Libraries]
-* [https://github.com/mathertel/LiquidCrystal_PCF8574 LiquidCrystal_PCF8574] derived from [https://www.arduino.cc/en/Reference/LiquidCrystal Liquid Crystal]
 * [https://fastled.io/ FastLED] for WS2812B programmable LED strips
 ** [https://fastled.io/docs/examples.html Code Examples]
 ** [https://github.com/FastLED/FastLED/wiki/Pixel-reference Colour Reference]
+* [https://github.com/feilipu/Arduino_FreeRTOS_Library FreeRTOS]
+* [https://github.com/embeddedartistry/arduino-printf LibPrintf]
+* [https://github.com/mathertel/LiquidCrystal_PCF8574 LiquidCrystal_PCF8574] derived from [https://www.arduino.cc/en/Reference/LiquidCrystal Liquid Crystal]
+* [https://github.com/mathertel/OneButton OneButton]
 * [https://github.com/NicoHood/PinChangeInterrupt Pin Change Interrupt]
-* [https://github.com/mathertel/OneButton OneButton]
 * [https://github.com/neosarchizo/TinyGPS TinyGPS]