Next, use the "dfu-programmer" command to set the Adruino into DFU mode and upload the PM firmware ( Arduino-usbserial-uno.hex).First, you must connect two points of the Adruino UNO board to ground.The process is similar to going from PM to KM,except that this time the "dfu-programer" command is used to upload the PM firmware (.hex) file: So, when you are finished running the KM sketch, you need to use DFU mode to upload the original PM firmware ( Arduino-usbserial-uno.hex). IMPORTANT: While the Arduino UNO board is in keyboard mode, you can no longer upload new sketches. The KM sketch will begin to run.įor details, please refer to DFU Mode Arduino UNO without soldering.
Next, use the "dfu-programmer" command to set the Adruino into DFU mode and upload the keyboard firmware ( Arduino-keyboard-0.3.hex) file.So, to start, compile and upload your "Keyboard Mode (KM)" sketch the same way you would normally for non-KM sketches. The original Adruino UNO board starts in "Programming Mode (PM)".Connect a USB cable to the Arduino UNO board.
So the programming sequence goes like this: The fore-mentioned DFU mode is a more commonly used term that we will recognize as an intermediate state required to "toggle" between these other two states. KM is the "mode" where your sketchĬan interface with you computer as if it were a standard USB keyboard.
PM refers to the "mode" where the standardĪrduino USB firmware is installed to the Arduino UNO board. These are just terms I have created for the purpose of this description. In the following discussion, I am going to refer to "Programming Mode (PM)" and "Keyboard Mode (KM). While a keyboard device, an Adruino sketch can include sending "keystrokes" to the USB host device such as a PC or Mac. While in DFU mode, the Arduino board's USB interface firmware is changed from a USB Arduino programming device to a USB keyboard interface device. Here's the gist of the solution: The Arduino UNO board needs to be put into Device Firmware Update (DFU) Mode. Better yet, there are several Arduino-savvy power users who have figured out and shared their knowledge with the rest of the Arduino user community. keyboard) while supporting uploading compiled sketches to the microprocessor.įortunately, I am not the first Arduino UNO user who has run across this limitation. The root of the problem, is that the Arduino UNO board cannot behave like a USB HID (e.g. Unfortunately, this support does not extend to the Arduino UNO boards. I started out by searching the online Arduino help web pages and discovered that native Arduino software libraries exist to support creating a USB Human Interface Devices (HID) such as a keyboard, mouse or gaming joystick.
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