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Keyestudio Leonardo R3 Board Ks0248 (Compatiable) + Usb cable
The keyestudio Leonardo is a microcontroller board based on the ATmega32u4 It is an easy to use open-source hardware.
It has 20 digital input/output pins (of which 7 can be used as PWM outputs), 12 analogue inputs, a 16 MHz crystal oscillator, a micro USB connection, a power jack, an ICSP header, and a reset button.
It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started. Note that ICSP (In-Circuit Serial Programming) header can not only program the firmware to Atmega32u4, but also be used as SPI communication interface.
The keyestudio Leonardo can be powered via the micro USB connection, or via an external power supply jack (DC 7-12V) or even with female headers Vin /GND (DC 7-12V).
The Leonardo differs from other Arduino boards using separate USB-Serial chip in that the ATmega32u4 has built-in USB communication, eliminating the need for a secondary processor. This allows the Leonardo to appear to a connected computer as a mouse and keyboard.
|Input Voltage (recommended)||DC7-12V|
|Digital I/O Pins||20 (of which 7 provide PWM output)|
|PWM Digital I/O Pins||7|
|Analog Input Pins||12|
|DC Current per I/O Pin||40 mA|
|DC Current for 3.3V Pin||50 mA|
|Flash Memory||32 KB (Atmega32u4) of which 4 KB used by bootloader|
|SRAM||2.5 KB (ATmega32u4)|
|EEPROM||1 KB (Atmega32u4)|
|Clock Speed||16 MHz|
- PCB Dimensions: 71mm*54mm*15mm
- Weight: 18.4g
Element and Interfaces
Specialized Functions of Some Pins
|Digital I/O pins||D0-D13 and A0-A5 (D18-D23); Note that if the digital pins are not enough, the ICSP pins can be used as digital pins. MISO (D14); SCK(D15); MOSI (D16).|
|Analog Inputs||A0-A5, A6-A11 (on digital pins 4, 6, 8, 9, 10, and 12). That is, D4 (A6)、D6 (A7)、D8 (A8)、D9 (A9)、D10 (A10) and D12 (A11).|
Pins A0-A5 appear in the same locations as on the Uno; inputs A6-A11 are on digital i/o pins 4, 6, 8, 9, 10, and 12 respectively. Each analog input provide 10 bits of resolution (i.e. 1024 different values). By default the analog inputs measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and thean alogReference() function.
|PWM (Pulse-Width Modulation)||D3, D5, D6, D 9, D10, D11 and D13. Provide 8-bit PWM output with the analogWrite()function.|
|External Interrupts||D3 (interrupt 0); D2 (interrupt 1); D0 (interrupt 2), D1 (interrupt 3) and D7 (interrupt 4).|
These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value. See the attachInterrupt() function for details.
|Serial communication||D0 (RX) and D1 (TX).|
|SPI communication||On the ICSP header.|
These pins support SPI communication using the SPI library. Note: the SPI pins are not connected to any of the digital I/O pins as they are on the Uno. They are only available on the ICSP connector. This means that if you have a shield that uses SPI, but does NOT have a 6-pin ICSP connector that connects to the Leonardo's 6-pin ICSP header, the shield will not work.
|AREF||Reference voltage for the analog inputs.|
Used with analogReference() Sometimes used to set the external reference voltage (0-5 volts) as the upper end of analog input pins.
|IOREF||The voltage at which the i/o pins of the board are operating (i.e. VCC for the board).|
This is 5V on the Leonardo. Used to configure the operating voltage of microcontroller.
- Automatic (Software) Reset:
Rather then requiring a physical press of the reset button before an upload, the Arduino Nano is designed in a way that allows it to be reset by software running on a connected computer.
- USB Overcurrent Protection:
The Leonardo has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed.
Detailed Use with ARDUINO Software as follows
Step1| Download the Arduino IDE
When you get the board, first you should install the Arduino software and driver.
We usually use the Windows software Arduino 1.5.6 version. You can download it from the link below:
Or you can browse the ARDUINO website to download the latest version from this link, https://www.arduino.cc, pop up the following interface.
In this software page, on the right side you can see the version of development software for different operating systems. ARDUINO has a powerful compatibility. You should download the software that is compatible with the operating system of your computer.
We will take WINDOWS system as an example here. There are also two options under Windows system, one is installed version, the other is non-installed version. For simple installed version, first click Windows Installer, you will get the following page.
This way you just need to click JUST DOWNLOAD, then click the downloaded file to install it.
For non-installed version, first click Windows ZIP file, you will also get the pop-up interface as the above figure.
Click JUST DOWNLOAD, and when the ZIP file is downloaded well to your computer, you can directly unzip the file and click the icon of ARDUINO software to start it.
Installing Arduino (Windows)
Wait for the installing process, if appear the interface of Window Security, just continue to click Install to finish the installation.