Build arduino usb host shield
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For the rest, the HID support in the library is designed in such a way that almost everything happens automatically, the only device-specific piece of code being the parser. If you’re curious about the protocol details, this trace contains scale initialization performed by a Windows 7 PC, as well as report polling. I recently started a github repository containing USB device traces. The code is very similar to one written to poll a Logitech joystick, the main differences being (obviously) report data structure and parsing as well as using an LCD for the output along with the terminal. If everything is good, the following will be printed:Īs I said before, the scale is a HID device and it works similarly to any other HID device – after initialization it starts responding to requests from the host reporting its state. Now it’s time to load a sketch, connect the scale to the USB port of the shield and open a terminal. In order to see the characters, the display must be biased – a 5K-10K pot with wiper on Vo and other two pins on 5V and ground will provide contrast adjustment. In addition to data lines, 5V and ground must also be connected to the shield’s 5V and GND terminals the RW pin must be grounded – I do it on the LCD itself. In this project, the LCD is connected to the shield’s GPOUT pins, as documented in max_LCD.h header file. It has been tested with Arduino IDE version 1.0.5.
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The example code is also hosted at github, as well as in ‘examples’ section of the library under ‘HID’. Scales are standard HID devices with usage table 0x8d, therefore, scales from other brands may work as well with no or minimal modifications to the code
#Build arduino usb host shield serial
If you’re planning to use this sketch for something else, like data logging, the display is optional – all output from the scale is repeated to the serial port Toshiba HD44780-compatible LCD display, in 16×1 or 16×2 configuration.Standard size board, such as UNO, Duemilanove or Leonardo, will work The secondary objective of this project was to demonstrate LCD support in USB Host shield library. I also wrote a small sketch which polls the scale and outputs the weight. To test this theory I made a simple setup consisting of Arduino UNO, USB Host shield and HD44780-compatible LCD display. However, since the scale is a USB HID device reading data from it should be as easy as from a joystick and Arduino board should be adequate to provide a display function for it. The scale doesn’t have a display making any kind of standalone use difficult. It is a nice little scale which works very well (much better than service itself) while attached to my workstation. I am the proud owner of Model 510 5lb digital scale.