KEYESTUDIO Leonardo R3 Development Board with USB Cable for Arduino

This development board offers incredible value with its exceptional quality and impressive performance, making it a top choice for Arduino enthusiasts. Highly recommended.

Highly recommend the Leonardo developing board, the time response to the quality to the number of inputs/outputs and its variations is very competitive to other developing board in economical cost.

Does exactly what I needed it to do. It arrived quickly and works as expected with no problems. Price is better than other options. Highly recommended.

I needed an Arduino for a custom sim racing pedal setup and this board delivered. I was able to load a script into it that works seamlessly and the board overall is of nice quality. Thank you

I bought this to use for a midi controller drum pad. It arrived quickly and works as expected with no problems. Price is better than other options.

This bit of kit is an enabler for all those who either have low level microprocessor development back grounds but no access to the kit anymore or those that are brand new to the fun and games. It is a well made piece of kit that, as far as I can tell fully conforms. Good stuff!

Overview: I am pleased w/ this purchase. I use it as an "Uno substitute": its useful for prototyping, but I'm unlikely to use as the final MCU in a project. It is 50x70mm, matching the board size of a Genuino Uno. Details and testing: Packaging: Arrived in a Keyestudio display (cardboard) box, inside a 2nd crush-resistant cardboard box. The package includes a serial cable. Appearance: The board has "spiffy" yellow labelling and yellow headers on a black background. Components & electrical testing: The microprocessor, in the 44-pin TQFP form factor, is labelled "Atmel mega32U4, -MU, 2335 PU". On-board voltage regulator is the AMS1117-5v. With a 9-v battery plugged to the barrel jack (or the Vin pin), Vout is 5.04v. Functional testing: (a) Program upload: With a 9-v battery attached, the on-board LED flashed at 1 Hz, implying the "blink sketch" is running and the Bootloader is present. No need to install other software (e.g., QMK firmware). I opened the Arduino IDE, plugged in the serial cable, then checked Tools|Port. The IDE recognized the board as "COM# (Arduino Leonardo)". (b) UART-USB-Serial interface: Unlike some 32U4 boards, this MCU has on-board UART IC, making serial programming easy. I selected Tools|Board|Arduino AVR boards and chose "Leonardo". I created & uploaded a "Hello World" sketch and opened a serial window => success. (c) Analog pins/ADC: The ADC and all analog pins were functional. I created ~2v at the mid-pt of a voltage divider and measured the value returned from the A0 pin. The value was in the expected range (422, corresponding to 2.2v, w/ similar values fr pins A1-A5, as well as, a Genuino Uno). d) PWM pins: I successfully made LEDs attached to PWM pins (3, 5, 6, 9, 10, & 11) fade. e) Memory: successful access to flash [32kb (28.7kb+bootloader)], SRAM (2.5kb) and EEPROM (1kb), confirming the expected values.

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