Arduino: Difference between revisions

Latest revision as of 08:15, 6 October 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).

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

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

Hardware

Arduino Duemilanove
- ATmega328 (16 MHz)
- PlatformIO
Arduino Uno R3
- ATmega328P (16 MHz)
- PlatformIO
SparkFun Pro Micro
- ATMEGA32U4 (16 MHz)
- PlatformIO
- Direct USB -> can appear as mouse/keyboard
Arduino Nano
- ATmega328PB (Micro USB) (16 MHz)
  - PlatformIO
- ATmega328PB (USBC) (16 MHz)
  - PlatformIO

See: 328PB additions.

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

Common additions:

lib_deps = fastled/FastLED@^3.10.3
monitor_speed = 115200
upload_port = COM3

@@ Line 1: / Line 1: @@
 == General ==
+=== 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 in software IDE (see [https://rheingoldheavy.com/arduino-from-scratch-part-11-atmega328p-dtr-and-reset/ here]).
+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]).
+=== millis() ===
-* [https://docs.arduino.cc/retired/boards/arduino-duemilanove/ Duemilanove]
+* 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 ==
 * [https://docs.arduino.cc/language-reference/ Arduino Language Reference]
+* [https://docs.arduino.cc/learn/programming/memory-guide/ Arduino Memory Guide]
 == Useful Libraries ==
@@ Line 25: / Line 34: @@
 * [https://github.com/neosarchizo/TinyGPS TinyGPS]
-== Other ==
+== Hardware ==
+* [https://docs.arduino.cc/retired/boards/arduino-duemilanove/ Arduino Duemilanove]
+** ATmega328 (16 MHz)
+** [https://docs.platformio.org/en/stable/boards/atmelavr/diecimilaatmega328.html PlatformIO]
+* [https://docs.arduino.cc/hardware/uno-rev3/ Arduino Uno R3]
+** ATmega328P (16 MHz)
+** [https://docs.platformio.org/en/latest/boards/atmelavr/uno.html PlatformIO]
+* [https://www.sparkfun.com/pro-micro-5v-16mhz.html SparkFun Pro Micro]
+** ATMEGA32U4 (16 MHz)
+** [https://docs.platformio.org/en/latest/boards/atmelavr/sparkfun_promicro16.html PlatformIO]
+** Direct USB -> can appear as mouse/keyboard
+* [https://docs.arduino.cc/hardware/nano/ Arduino Nano]
+** ATmega328PB (Micro USB) (16 MHz)
+*** [https://docs.platformio.org/en/latest/boards/atmelavr/nanoatmega328.html PlatformIO]
+** ATmega328PB (USBC) (16 MHz)
+*** [https://docs.platformio.org/en/latest/boards/atmelavr/nanoatmega328new.html PlatformIO]
+See: [https://wolles-elektronikkiste.de/en/atmega328pb-based-boards 328PB additions].
 == Development Environment ==
@@ Line 42: / Line 69: @@
 === Platformio.ini ===
-* monitor_speed = 115200
+Common additions:
+ lib_deps = fastled/FastLED@^3.10.3
+ monitor_speed = 115200
+ upload_port = COM3