Likewise, most of the Arduino guides work out-of-the-box with Uno, but not necessarily with Leonardo Leonardo is always one of those footnotes: If you have Leonardo, you need to do this other thing instead. By default, on most of the Arduinos, SS is defined to be on pin 10, and on the Arduino Mega2560, it is on pin 53. The ICSP interface however does not expose the SS line. These devices are more correctly called “Arduino compatibles. For example, most of the Arduino posts here and on EE.SE are either based on Uno or are compatible with Uno. This is one of the reasons that some of the Arduino shields designed for Arduino Uno does not work with Arduino Leonardo when SPI communication is involved. Only boards from can officially be called an “Arduino.” (The name is trademarked.) From an open source perspective, as Arduino grew in popularity the Software, or Integrated Development Environment (IDE), has been expanded to support many other boards. Arduino Leonardo is capable of using 20 pins as compared to Uno 14 as it can use the analog pins to be I/O Extra PWN Pin. The Arduino Leonardo has the same GPIO pin-count as the other 'Uno' style boards, but more of the pins play 'double duty' as both analog and digital pins, hence the higher numbers. The Arduino MEGA above is programming an Arduino UNO connecting D51-D11, D50-D12, D52-D13, GND-GND, 5V-5V and D10 to RESET. It has 20 digital input/output pins (of which 7 can be used as PWM outputs and 12 as analog inputs), a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button. There are two elements to the name: the boards and the software. The Arduino Leonardo is a microcontroller board based on the ATmega32u4 (datasheet). First you have to wait for the Serial Monitor to open in a waiting loop, then you can send data. The Arduino Leonardo has a USB CDC device inside the microcontroller. The only difference is the lack of a DC input jack. You can send whatever you want to the TX pin, regardless if that is used or not. Its functionalities are the same as the Arduino Leonardo. Arduino is an open source hardware platform. Arduino Micro Just like Arduino Nano is a UNO in a small form factor, Arduino Micro is actually a Leonardo in a small form-factor breadboard-friendly sized board.
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