I'll describe two methods for using the Raspberry Pi camera in the Wolfram language. Once you have set up the camera, you are ready to start using your camera module with Wolfram. You'll also find a description of how to use the camera at the Raspberry Pi Foundaion website. (The commands described in this section will also work at the Wolfram command-line interface, but because the command line doesn't offer a graphical interface, you won't see the graphical output from the camera, making the experience a bit lackluster.) If you want to see pictures, use Mathematica.īefore you start, you need to attach your camera and set it up as described in a previous article in Raspberry Pi Geek. Mathematica also offers some interesting options for accessing and programming the Raspberry Pi camera module. If you have enjoyed this intro to GPIO interfacing in Wolfram and would like to try some more complex projects, I highly recommend searching the Wolfram community Raspberry Pi forum, which includes a large number of project examples posted by friendly community members – including controlling stepper motors and importing data from GPS modules and accelerometers. The Wolfram language, and hence Mathematica, is capable of interfacing with many devices over the GPIO pins, and this is just a basic example. The program will execute the traffic light simulation and repeat it three times. After entering the code, press Shift+Enter to execute. The code to achieve this pattern is shown in Listing 4. To simulate a real traffic light system (at least the way they work in the UK – the sequence will be different depending on where you live), you will want the red LED to come on first, then the yellow LED should come on briefly while the red is still on, and then the yellow and red should go out and the green should come on then, the yellow should show briefly, followed by the red. You can then turn them off again using the same command by just replacing the 1 with a 0: Do[
This code turns on the green LED first, then the yellow, and then the red, with a gap of 0.5 seconds between each. Then, you can turn all the LEDs on in sequence as follows: Do[ You then need to define which pins you are using to automate the LED on/off process: ledpins = Turn the Raspberry Pi on and start Mathematica or the Wolfram command-line interface.
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