Developing apps for the Raspberry Pi that utilize the Xbox 360 Kinect is best accomplished with libfreenect. Libfreenect is an open-source library that provides access to the sensors and motors on the Kinect.
Raspbian’s apt repository has version 0.2 of libfreenect, which is quite old and seems to be missing a lot of the features that the latest code has. I’ve documented the steps for building the latest LibFreenect source code and dependencies, below (0.5.3 as of this post).
Continue reading “Kinect support for Raspberry Pi using libfreenect”
Commands like timeout.exe were added to Windows to make waiting in a batch file easier. Unfortunately timeout.exe still leaves much to be desired. There are several alternatives people use to simulate a delay in the Windows Command Prompt (cmd.exe).
Below you can see an analysis of the suggestions from this StackOverflow post, along with one additional suggestion I have that will increase precision (method 1 below).
The key factors I’m analyzing is the time precision of a command and I attempt to determine the compatibility with past versions of Windows. I also want this to work out-of-the-box with Windows and not require an external executable to be loaded.
My test consisted of the following methods:
- Method 1: Custom Function
call :waitfor 5000>nul (see below for implementation details)
- Method 2: Ping.exe (dummy IP, timeout)
ping.exe -n 1 -w 5000 126.96.36.199 >nul 2>&1
- Method 3: Ping.exe (localhost, 1 sec between pings)
ping.exe -n 6 -w 1 127.0.0.1 >nul 2>&1
- Method 4: Powershell.exe
powershell.exe -command "Start-Sleep -Milliseconds 5000">nul
- Method 5: Timeout.exe
timeout.exe /t 5 /nobreak >nul 2>&1
- Method 6: VBScript (cscript.exe)
echo WScript.Sleep^(WScript.Arguments^(0^)^) >"%temp%sleep.vbs" && cscript "%temp%sleep.vbs" 5000 >nul
Continue reading “Waiting (or “sleeping”) in a batch file”