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I have a MacBook Pro running OS X Yosemite (10.10.3). I connected my Arduino UNO R3 to my computer for the first time after the Yosemite upgrade - it worked fine before this! When I opened the Arduino IDE I selected Tools Board 'Arduino UNO', but when I try to choose a Serial Port the only options are. Mac OSX 10.14.6 Arduino IDE 1.8.11 VSCode 1.43.0 Arduino-Extension 0.2.29. Going through the command palette didn't work either. After setting the port manually through arduino.json upload worked, but serial monitor still does not. NEW UPDATE HERE TO FIX THE SERIAL PORT ON MAC OS SIERRA: There is a tutorial to. While entering the serial port name into the code in arduino IDE, enter the whole port address i.e: /dev/cu.usbmodem. or /dev/cu.UG-. where the. is the port number. And for the port number in case of mac just open terminal and type. Ls /dev/. and then search for the port that u have set in arduino IDE. Permissions on the USB port. As a Linux user you'll need to be a member of the group dialout to be able to read and write to any /dev/tty. connections. Thus, making the connection world-writable or running the Arduino IDE as root is both not the way to go. It will be enough to add your user to the group dialout and re-login afterwards. Sudo adduser.username. dialout.

Released:

Use your Arduino as a data acquisition card under Python

Project description

PyFirmata2 turns your Arduino into a data acquisition card controlled by Python.

Just upload the default firmata sketch into your Arduino and you are all set.

pyFirmata2 is an updated version of pyFirmata which adds precise samplingto the API so that it’s possible to filter signals and in general dosignal processing. Instead of “sleep” commands which have unreliable timingthe Arduino performs the sampling in its firmware and transmits the datathen to pyFirmata2. The Python application simply registers a callbackwhich is then called every time after new data has arrived.

This API has been used in my Digital Signal Processing (DSP) class topractise realtime filtering of analogue sensordata. Examples can be viewed on the YouTube channel of theclass: https://www.youtube.com/user/DSPcourse

Installation

Upload firmata

Install the Arduino IDE on your computer: https://www.arduino.cc/en/Main/Software

Start the IDE and upload the standard firmata sketch into your Arduino with:

Install pyfirmata2

The preferred way to install is with pip / pip3. Under Linux:

and under Windows/Mac type:

You can also install from source with:

Under Linux type:

Under Windows / Mac:

Usage

Initialisation

Create an instance of the Arduino class:

which automatically detects the serial port of the Arduino.

If this fails you can also specify the serial port manually, for example:

Under Linux this is usually /dev/ttyACM0. Under Windows this is aCOM port, for example COM4. On a MAC it’s /dev/ttys000, /dev/cu.usbmodem14101 orcheck for the latest addition: ls -l -t /dev/*.

Starting sampling at a given sampling interval

In order to sample analogue data you need to specify asampling interval in ms. The smallest interval is 10ms:

Calling samplingOn() without its argument setsthe sampling interval to 19ms.

Enabling and reading from analoge pins

To process data at a given sampling interval register a callbackhandler and then enable it:

where myCallback(data) is then called every time after data has been receivedand is timed by the arduino itself.

You can also read additional analogue pins any time by issuing a readcommand:

This is useful for reading additional pins within a callback handlerto process multiple pins simultaneously. Note that the data obtainedby read() is read from an internal buffer which stores the mostrecent value received from the Arduino. This call is non-blocking.You also need to run enable_reporting() on that pin before you can use read().

Writing to a digital port

Digital ports can be written to at any time:

For any other functionality use the pin class below.

The pin class

The command get_pin requests the class of a pinby specifying a string, composed of‘a’ or ‘d’ (depending on if you need an analog or digital pin), the pinnumber, and the mode (‘i’ for input, ‘o’ for output, ‘p’ for pwm). Allseperated by :. Eg. a:0:i for analog 0 as input or d:3:p fordigital pin 3 as pwm:

Closing the board

To close the serial port to the Arduino use the exit command:

Example code

The directory https://github.com/berndporr/pyFirmata2/tree/master/examplescontains two realtime Oscilloscopes with precise sampling rate,a digital port reader, the ubiquitous flashing LED program anda program which prints data using the callback handler.

Troubleshooting

Spyder

Start your program from the (Anaconda-) console / terminal and never within Spyder. Here isan example for Windows:

The problem with Spyder is that it won’t let your Python program terminate properlywhich leaves the serial port in an undefined state. If you then re-run your programit won’t be able to talk to your Arduino. In the worst case you need to reboot yourcomputer. Bottomline: use Spyder for editing, run the program from the console / terminal.

After an update still the old version is being used

If you use the –user option to install / update packages Python might keep older versions.

Solution: Do a pip uninstall pyfirmata2 multiple times until no version is lefton your computer. Then install it again as described above.

Credits

The original pyFirmata was written by Tino de Bruijn.The realtime sampling / callback has been added by Bernd Porr.

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2.0.1

2.0.0

1.1.9

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1.1.7

1.1.6

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1.1.1

1.1.0

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1.0.2

1.0.1

1.0.0

0.9.9

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0.9.7

Arduino To Arduino Serial

0.9.6

0.9.5

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0.9.3

0.9.2

0.9.1

Arduino Ports Com

0.9.0

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Serial Port For Mac Arduino Pinout