====== Arduino ======

Arduino is an open-source electronics platform based on easy-to-use hardware and software. It's intended for anyone making interactive projects.

===== Arduino Uno =====

https://www.arduino.cc/en/Main/ArduinoBoardUno

==== Technical specs ====

|Microcontroller|ATmega328P|
|Operating Voltage| 5V |
|Input Voltage (recommended)| 7-12V |
|Input Voltage (limit)|6-20V |
|Digital I/O Pins|14 (of which 6 provide PWM output)|
|PWM Digital I/O Pins|6|
|Analog Input Pins|6|
|DC Current per I/O Pin|20 mA|
|DC Current for 3.3V Pin|50 mA|
|Flash Memory|32 KB (ATmega328P)\n of which 0.5 KB used by bootloader|
|SRAM|2 KB (ATmega328P)|
|EEPROM|1 KB (ATmega328P)|
|Clock Speed|16 MHz|
|Length|68.6 mm|
|Width|53.4 mm|
|Weight|25 g|

===== Arduino MEGA 2560 =====

  * https://www.arduino.cc/en/Main/ArduinoBoardMega2560

==== Arduino MEGA 2560 driver CH340 klon ====

  * http://robotdyn.com/catalog/boards/mega_2560_ch340g_atmega2560_16au_compatible_with_arduino_mega_2560/
  * http://wch.cn/download/CH341SER_ZIP.html (driver)

==== Specifikace ====

  * Arduino Mega 2560 Rev3 form-fuctor
  * ATmega 2560 (16Mhz), a microcontroller
  * CH340G - USB-UART interface
  * Input voltage 6-12V
  * Output voltage 5V - 800mA, 3.3V - 350mA
  * MicroSUB - connection socket
  * 70 digital I/O
  * 16 analog inputs
  * 14 PWM
  * 4 bus of UART

===== Libraries =====

https://github.com/NicoHood/SerialProtocol

===== Programování =====

==== Ochrana proti přetečení millis() ====

<code c>
unsigned long currentMillis = millis();
if ((unsigned long)(currentMillis - previousMillis) >= interval) {
  previousMillis = currentMillis;
}
</code>

===== Bootloader OWL =====

  * http://jtxp.org/tech/onewayloader_en.htm
  * https://www.pstehlik.cz/prezent/PokrocileBootloaderyProAVR.pdf
  * https://pstehlik.cz/prezent/owl-postup.sh