====== Current Voltage Logger (CVL) ======

The CVL is an in-house, open sourced data logger that will assist SCEL students when doing their analysis of components and boards. We had a need to collect current and voltage readings over a time interval so we can estimate the power consumption of devices. 

This particular project hopes to build a cheap and useful tool that will also serve as an educational tool for future students in the lab. 

----
===== Specifications =====
[[ Initial Specification ]]
==== Current Specifications ====
  * Collect current and voltage readings from DUT
  * Transmit data to a computer at real time through a USB to RS232 converter
  * Display data after collection
  * Export data as a .csv file
  * DUT must have a maximum of 10 V and 3.2 A
  * Current repository can be [[https://github.com/alliekim13/GUI|found here]]

----
===== Goals =====
  * Develop an open-source tool for measuring real-time current and voltage
  * Create a GUI that will allow users to visualize and export data as .csv files

----
===== Remaining Tasks and Future Improvements =====
  * Live plotting
  * Dynamically select USB port (must currently be hard-coded)
  * Testing system performance for high resolution readouts
  * Power-saving features
  * Simple data analysis tools 

----
===== Block Diagrams =====
==== Overall Block Diagram ====
{{:instrumentation:cvl:ee_496x_block_diagram_final.png|}}

==== User Interface State Diagram ====

{{:instrumentation:cvl:finalblock.png|}}

----
===== Meeting Minutes =====
[[Meeting Minutes April 28, 2016]]

[[Meeting Minutes April 14, 2016]]

[[Meeting Minutes April 7, 2016]]

[[Meeting Minutes March 31, 2016]]

[[Meeting Minutes March 17, 2016]]

[[Meeting Minutes March 10, 2016]]

[[Meeting Minutes March 3, 2016]]

[[Meeting Minutes February 25, 2016]]

[[Meeting Minutes February 18, 2016]]

[[Meeting Minutes February 11, 2016]]

[[Meeting Minutes February 4,2016]]

[[Meeting Minutes January 28,2016]]

[[Meeting Minutes January 21,2016]]

----

===== Presentations =====
{{:instrumentation:cvl:instrumentation_final.pdf|}}

{{:instrumentation:cvl:instrumentation_cdr.pdf|}}

{{:instrumentation:cvl:instrumentation_pdr.pdf|}}

{{:instrumentation:cvl:instrumentation_proposal.pdf|}}

----
===== Bill of Materials =====
{{:instrumentation:cvl:instrumentation_billofmaterials.png|}}
----
===== Schematic  =====
{{:instrumentation:cvl:schematic_layout.png|}}
----
===== Board Layout  =====
{{:instrumentation:cvl:board_layout.png|}}
----
===== Resources =====

{{:instrumentation:cvl:current_sensor_ina219.pdf|}}

[[https://learn.adafruit.com/adafruit-ina219-current-sensor-breakout/overview]]

[[https://learn.adafruit.com/adafruit-ina219-current-sensor-breakout/library-reference]]

[[https://blog.udemy.com/arduino-voltmeter/ ]]

[[https://www.arduino.cc/en/Main/Standalone]]

[[https://www.arduino.cc/en/Tutorial/ArduinoToBreadboard]]

==== Link to Project ====
As this is a work in progress, please see [[https://github.com/alliekim13/GUI|this link]] for updated versions of the GUI. 

===Instructions to run script.===
  * Install python if not already installed.
  * Install necessary libraries by using the following commands. 
    * Install [[http://matplotlib.org/users/installing.html|matplotlib]]
    * Install [[http://pyqt.sourceforge.net/Docs/PyQt4/installation.html|PyQt]]
    * Install [[http://pyserial.readthedocs.io/en/latest/pyserial.html|pyserial]]
  * Through command line, navigate to project main directory and run: python main.py