Merge branch 'master' into dash-cytoscape-phylogeny

Author: ronniebugia

apps/dash-daq-iv-tracer/.gitignore

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+*.pyc
+.DS_Store
+venv/
+venv
+.vscode/settings.json

apps/dash-daq-iv-tracer/Procfile

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+web: gunicorn --pythonpath apps/dash-daq-iv-tracer demo:server

apps/dash-daq-iv-tracer/README.md

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+# Dash DAQ IV Curve Tracer
+
+Dash abstracts away all of the technologies and protocols required to build an interactive web-based application, and
+is a simple and effective way to bind a user interface around your Python code. To learn more about Dash, check out our
+[documentation](https://dash.plot.ly/).
+
+## About the app
+
+`dash-daq-iv-tracer` uses the graphic elements of Dash DAQ to create an interface for acquiring current-voltage I-V curves with a Keithley 2400 SourceMeter.
+[Try this demo app](https://github.com/plotly/dash-sample-apps/tree/master/apps/dash-daq-iv-tracer) on the Dash Deployment Server], and read more about the code in [our blog post](https://www.dashdaq.io/build-an-i-v-curve-tracer-with-a-keithley-2400-sourcemeter-in-python).
+
+### IV Curves
+
+I-V curve is a good way to characterize electronic components (diode, transistor or solar cells) and extract their operating properties. It is widely used in electrical engineering and physics.
+The Keithley 2400 SourceMeter provides precision voltage and current sourcing as well as measurement.
+
+### dash-daq
+
+[Dash-DAQ](http://dash-daq.netlify.com/#about) is a data acquisition and control package built on top of Plotly's
+[Dash](https://plot.ly/products/dash/). It comprises a robust set of controls that make it simpler to integrate data
+acquisition and controls into your Dash applications.
+
+## Getting Started
+
+### Controls
+
+- Single measurement mode: Adjust the value of the source with the knob at the bottom of the graph area and click on the `SINGLE MEASURE` button, the measured value will be displayed. Repetition of this procedure for different source values will reveal the full IV curve.
+
+- Sweep mode: Set the sweep parameters `start`, `stop` and `step` as well as the timevspent on each step, then click on the button `START SWEEP`, the result of the sweep will be displayed on the graph. The data is never erased unless the button `CLEAR GRAPH` is pressed, or if the source type is changed.
+
+- Dark/light theme: Click on theme toggle on top of the page to view dark/light layout.
+
+### Running the app locally
+
+First create a virtual environment with conda or venv inside a temp folder, then activate it.
+
+```
+virtualenv venv
+
+# Windows
+venv\Scripts\activate
+# Or Linux
+source venv/bin/activate
+
+```
+
+Clone the git repo, then install the requirements with pip
+
+```
+
+git clone https://github.com/plotly/dash-sample-apps
+cd dash-sample-apps/apps/dash-daq-iv-tracer
+pip install -r requirements.txt
+
+```
+
+Run the app
+
+```
+
+python demo.py
+
+```
+
+## Screenshots
+
+![IV Curve Tracer](screenshots/iv-tracer-screenshot.png)
+
+![IV Curve Tracer](screenshots/iv-tracer-dark.png)
+
+![animated](screenshots/iv-tracer-demo.gif)