You can actually delete the module folder and tar. More information on how this works can be found here:. FYI, many Python modules can be found in Windows. A good resource for Windows binary files for bit and bit OS can be found here:. Simply, connect the TX pin to the RX pin with a wire to form a loopback. Anything that gets sent out of the serial port transmit pin gets bounced back to the receive pin. This test proves your serial device works and that you can send and receive data.
We can see a list of available ports by typing this:. Now download the piece of code below and open it in a text editor make sure everything is tabbed in 4 space intervals!!
If you are running linux, read the comments above for ser. The readline function will read in a series of bytes terminated with a new line character i. For more information on how to use pyserial, look here. Just be aware that 'print' does not mean print out to the serial port, it prints to the console window.
Notice, we don't define the type of variables i. If you need to make calculations, you will need to type cast your variables as floats.
An example of this is in the GPS tracking section below. Now try to run the script by typing remember you need to be working out of the directory of the pythonGPS. This script will open a port and display the port number, then wait for you to enter a string followed by the enter key. You have just made yourself a very simple serial terminal program that can transmit and receive data! Now that we know how to run a python script and open a serial port, there are many things you can do to create computer applications that communicate with embedded hardware.
In this example, I am going to show you a program that reads GPS data over a serial port, saves the data to a txt file; then the data is read from the txt file, parsed, and plotted on a map. There are a few steps that need to be followed in order for this program to work.
Install the modules in the order below. The above process worked for me on my W7 machine, but I had to do some extra steps to get it to work on Ubuntu. Same might be said about Macs. With Ubuntu, you will need to completely clean your system of numpy, then build the source for numpy and matplotlib separately, so that you don't mess up all of the dependencies.
Here is the process I used for Ubuntu. Once you have all of these modules installed without errors, you can download my project from github and run the program with a pre-loaded map and GPS NMEA data to see how it works:. Any map image will work, all you need to know are the bottom left and top right coordinates of the image. The map I used was a screen shot from Google Earth. I set placemarks at each corner and noted the latitude and longitude of each corner. Be sure to use decimal degrees coordinates.
Then I cropped the image around the two points using gimp. The more accurate you crop the image the more accurate your tracking will be. Save the image as 'map. It is probably best to allow the GPS to get a lock by leaving it powered for a few minutes before running the program.
If the GPS doesn't have a lock when you run the program, the maps will not be generated and you will see the raw NMEA data streaming in the console window. If you don't have a GPS connected and you try to run the program, you will get out-of-bound errors from the parsing.
You can verify your GPS is working correctly by opening a serial terminal program. Save the python script into a folder and drop your map. People also like. Upgrade WP Free. Windows Insider Free. Update Central Free. Firmware Update Check - Update assistant for legacy Win. WinDroid Lollipop Free. Xender Free. Additional information Published by Ananthan Unni. Published by Ananthan Unni. Developed by Ananthan Unni. How can I connect my GPS to my computer? Many companies sell identical products - I have a feeling they all come from the same overseas source and differ only in the model name sticker and the name on the little CD driver that comes with the package.
The first thing you need to do is to install the driver software that comes with the USB to Serial Adapter. If you don't have the driver, you can go to the manufacturer's Web site to download and install it. This Agreement is the complete statement of the Agreement between the parties on the subject matter, and merges and supersedes all other or prior understandings, purchase orders, agreements and arrangements.
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