OLIMEXINO-32U4 - Open Source Hardware Board
OLIMEXINO-32U4 - Open Source Hardware Board OLIMEXINO-32U4 - Open Source Hardware Board OLIMEXINO-32U4 - Open Source Hardware Board
Open Source Hardware ARDUINO LEONARDO like development board
Price12.95 EUR
10 - 49 pcs11.66 EUR
50 - 10000 pcs10.36 EUR
In Stock

ARDUINO Leonardo like board with ATMEGA32U4.


  • ATMEGA32U4 microcontroller, all in one USB communication no need for external FTDI chip.
  • mini USB connector
  • Input power supply 7-12VDC
  • ULTRA LOW POWER voltage regulators and the consumption is only few microamps, which enables hand-held and battery powered applications.
  • Li-Ion rechargeable battery power supply option with a BUILD-IN on board charger, so when you attach a battery, it is automatically charged and kept in this state until the other power source (USB or external adapter) is removed and it will AUTOMATICALLY power the board - no jumpers, no switches!
  • Works both on 3.3V and on 5V which can be selected with a jumper, so 3.3V and 5V shields can be used
  • UEXT connector which allows many existing modules like RF, ZIGBEE, GSM, GPS to be connected
  • Allows real-time clock (Q1 can be replaced by RTC).
  • NOISE IMMUNE design
  • The LEDs and the button BUT are on the edge of the board so there is easy access even if the boards have shields on them
  • All of the components are LOWER than the connectors, so that the shields don't interfere with them
  • Original design had a flaw - the connectors were not spaced at 0.1" which made bread board use impossible, to keep the compatibility we have the original spacing but we also added a 0.1'' connector which customer can use with bread boards (and jumper wires) saving the hustle of soldering
  • All signals on the connectors are printed on the top of the board, so when you check with a probe you will know exactly which port you are measuring
  • 4 mount holes make board attachment easier
  • Industrial grade -45+85C





  • I can't find compatible drivers in the latest 1.0.1 Arduino IDE/drivers folder. What should I do?
  • You have to program the board with the latest bootloader available.
  • There is no 3.3V on pin #1 of the UEXT connector. Why?
  • The power output at the UEXT is controlled by pin D8, also called UEXT_PWR_E. This signal is connected to a FET. You need to drive D8 to low level to enable 3.3V on the UEXT. Use the following code:

    // UEXT power enable --> PORTB4 --> D8
    pinMode(8, OUTPUT);
    digitalWrite(8, LOW);
  • I installed version 1.0.0 of Arduino IDE but I can't find Leonardo under boards
  • Un-comment the Leonardo section in the "\hardware\arduino\boards.txt" file in your Arduino IDE install location
  • I disabled all interrupts and entered an infinite loop code on my board and now the bootloader won't start. How do I start it?
  • You need a programmer to program the bootloader again. Avoid disabling interrupts at all costs.