- #Arduino usb host shield logitech rumblepad serial
- #Arduino usb host shield logitech rumblepad driver
- #Arduino usb host shield logitech rumblepad code
- #Arduino usb host shield logitech rumblepad windows 7
Uint8_t reportID // scale ID – should be “A” Im trying to automate my home brewery □ and am using scales with a usb/serial output similar to yours though mine spit out ascii text.īased on the following description of my output string am i on the right track with the following edits to your sourcesīyte 8,9,10,11,12,13 NNN.NN Where N = 0to9 (float)īyte 14,15 = Chosen Units abrv (Kg,lb,oz, lb-oz) will focus on Kg string may be longer if lboz selected ? more testing needed.Ĭhanges to make to scale_rptparser.h are.
Here’s the fragment of the definition section: Next I want to show how these classes are instantiated in the main sketch.
If you don’t need to write your own parser but just want to change the behaviour of this example, the only place which needs to be modified is OnScaleChanged() method.
#Arduino usb host shield logitech rumblepad driver
HID driver periodically calls this name when it polls the HID device. Now, Where does this method actually gets called? In the same file several lines earlier from a method called Parse(). I first calculate the real weight (line 40) and then output it Line 37 – this status means the valid weight is present in the report.Almost every status means some kind of error so I just print the error message and return Line 19 – the switch statement handling status field of the report.Line 8 – I’m checking the report ID and return an error if the ID is wrong.Lines 4-6 – here I’m clearing the LCD screen to prepare for the new output.Void ScaleEvents :: OnScaleChanged ( const ScaleEventData *evt ) The meaning of the bytes, from left to right, is as follows: Below is a report returned by empty scale. Let’s go through the steps to change a joystick parser into a scale parser.
#Arduino usb host shield logitech rumblepad code
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.
#Arduino usb host shield logitech rumblepad windows 7
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. 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
#Arduino usb host shield logitech rumblepad 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
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.