DashR DAQ IV Tracer (plotly#275)

Author: CanerIrfanoglu

apps/dashr-daq-iv-tracer/Aptfile

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+libcurl4-openssl-dev
+libxml2-dev
+libv8-3.14-dev

apps/dashr-daq-iv-tracer/DOKKU_SCALE

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+web=1

apps/dashr-daq-iv-tracer/Procfile

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+web: R -f /app/apps/"$DASH_APP_NAME"/app.R

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

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+# DashR 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 R or Python code. To learn more about Dash, check out our
+[documentation](https://dashr.plot.ly/).
+
+## About the app
+
+`dashr-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/dashr-daq-iv-tracer) on the Dash Deployment Server.
+
+Also, you can access the Python version in the [Dash Gallery](https://dash-gallery.plotly.host/dash-daq-iv-tracer/).
+### 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.
+
+### dashr-daq
+
+[Dash-DAQ](https://www.dashdaq.io/) 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 time spent 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
+
+Clone the git repo:
+
+```
+git clone https://github.com/plotly/dash-sample-apps
+cd dash-sample-apps/apps/dashr-daq-iv-tracer
+```
+
+Run `Rscript init.R` to install all of the required packages
+
+Run `Rscript app.R`:
+
+The app should automatically open in your default browser. If it does not, navigate to 127.0.0.1:8050. You should see something like this: 
+
+
+## Screenshots
+
+![IV Curve Tracer](screenshots/iv-tracer-screenshot.png)
+
+![IV Curve Tracer](screenshots/iv-tracer-dark.png)
+
+![animated](screenshots/iv-tracer-demo.gif)
+