Download RasPi Magazine [UK], Issue 16 (2015) PDF
From the workforce at the back of Linux consumer & Developer journal, RasPi is the fundamental consultant to getting the main out of the Raspberry Pi credit-card sized laptop. jam-packed with professional tutorials on tips on how to layout, construct and code with the Raspberry Pi, this electronic journal will teach and encourage a brand new new release of coders and makers.
Read or Download RasPi Magazine [UK], Issue 16 (2015) PDF
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It takes a little longer to build than you’d think some virtual joysticks – one for movement and the other for camera control. This is optimised for smartphones with multi-touch capabilities but works fine with a mouse. The stream has very little lag, especially at close range, however in a building with busy Wi-Fi signals you’ll be a little limited in how far away you can control it. The programming is all Python and Arduino-based, available via the Dawn Robotics website, so you can easily program some autonomy into the robot and add it to the SD card plugged into the robot.
We’ll start by looking at the lowest level available to Python. The standard Python library includes a module called ‘socket’. By importing this module, you can talk to a network interface and observe what’s happening on it. Remember that you will need root access to talk to physical devices, like the network interface. This means that you need to either be the root user or to run your Python code under sudo. socket(socket. IPPROTO_TCP)’. The first parameter is the address family, the second is the socket type and the last is the protocol type.
If you can hit this machine at this port, the connect will succeed. Otherwise, it will fail with an error. Then send out an ICMP packet to this host. You will need to use the pack() of the Python struct module to create a binary struct that you can send on the socket connection – don’t forget to close this socket before moving on. If you have specific services that you want to check, you can create a stream socket. Then connect this new socket to the host and port where the service is located and you can use the sendall() function to send some query.