Skip to main content

A serial-port based oscilloscope

Project description

PyPI version

A serial port dual-channel oscilloscope. Python 3 only.

Screenshot (v0.1.3)

$ pip install SerialScope --user    # just for you

or,

$ sudo -E pip install SerialScope   # for all users

After installation, launch it.

$ serialscope

Path ~/.local/bin should be in your PATH environment variable.

or,

$ python3 -m SerialScope 

The default baud rate is 115200. The oscilloscope will automatically find any serial port which has arduino connected to it.

TODO/FIXME You can change these values from command line

usage: serialscope [-h] [--port PORT] [--baudrate BAUDRATE]

Arduino NeuroScope.

optional arguments:
  -h, --help            show this help message and exit
  --port PORT, -p PORT  Serial port.
  --baudrate BAUDRATE, -B BAUDRATE
                        Baudrate of Arduino board.

Dependencies

  • pyserial
  • pysimplegui
  • screeninfo (optional)

How it works

This oscilloscope has two channels. It assumes that 1 byte of data is sent for each channel. If you are using arduino's analog pins to read data, then your resolution would be 5/255 volts.

Arduino board

Function analogRead returns 10 bit value i.e., between 0 and 1023. You should scale it to 255, cast it to char before writing to serial port. This is for efficiency. Sending 10 bits data requires sending 2 bytes. For 2 channels, this would slow down the sampling rate by 4X compared to when only 1 byte is sent per channel.

You can use following snippets in your sketch.

Make sure that your arduino is set to use maximum possible baud-rate. I have used 115200 baud rate.,

// Two critical functions.
char intToChar( int val)
{
    // analogRead is 10 bits. Change it to 8 bits.
    char x = (char) (255.0 * val/1023.0);
    return x;
}

void write_data_line( )
{
    // channel A is on pin A0 and channel B is on A1
    char a = intToChar(analogRead(A0));
    char b = intToChar(analogRead(A1));
    Serial.print(a);
    Serial.print(b);
    Serial.flush();
}

A sketch is available in SerialScopeArduino/ directory. Open it in your arduino IDE and upload to your Arduino board.

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for SerialScope, version 0.2.2
Filename, size File type Python version Upload date Hashes
Filename, size SerialScope-0.2.2.tar.gz (86.8 kB) File type Source Python version None Upload date Hashes View hashes

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN DigiCert DigiCert EV certificate StatusPage StatusPage Status page