Constant Current Source for Coulometry (Group D) Nick Ben, Louis Muldrow, Yuan Liu, Bastien Levadoux, Nayyara Shaik Mentors: Frank Cardone, Dr. Skip Pomeroy
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Statement of Work (SOW) Our Role: Gather coulometer's data and use a cell phone as the I/O device. (Current and time need to be logged during the analysis). Analog switch replaced by digital switch (Bluetooth enabled) Data communicated from the coulometer to a cell phone Various readings displayed on Mobile Application
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Parts we Received
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Coulometer Device Schematic
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Built Constant Current Source
Analog Switch
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SOW (Main Goals) Analog Switch in Coulometer replaced by Digital Switch NPN Transistor
Data communicated from the coulometer to a cell phone Arduino Uno Module + BLE Module
Various readings displayed on Mobile Application Android App Displays: 1. Interval X Voltage, 2. Interval X Current, 3. Interval X Charge
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SOW Goal 1 Analog Switch Replaced by Digital Switch
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Analog Switch Replaced by Digital Switch
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NPN BJT Transistor Switch Base voltage < 0.6v
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BJT Open circuit
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No current flow
Base voltage > 0.6v •
Base current above 0
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BJT Short circuit
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emmiter connected to ground
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BJT Switch On
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BJT Switch Off
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SOW Goal 2 Data Communicated from Coulometer to Cell Phone
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Data Communicated from Coulometer to Cell Phone Bluetooth Low Energy: - Low cost - Low consumption - Small
- Fast (enough) - Easy to use coupled with a mobile app
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Data Communicated from Coulometer to Cell Phone Initiate the communication :
Communicate between devices :
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Data Communicated from Coulometer to Cell Phone
Prepend char X
Extendable
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Data Communicated from Coulometer to Cell Phone Older version of command receiving
single character limit no prepend
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Data Communicated from Coulometer to Cell Phone New version
Loop time controllable
Transmission controllable
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SOW Goal 3 Various Readings Displayed on Mobile Application
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Various Readings Displayed on Mobile Application Main Activity
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Various Readings Displayed on Mobile Main Activity App Bluetooth Connection
V/I Data + Charge
Start/Pause/Save/Reset Buttons
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Various Readings Displayed on Mobile Collecting Data w/ Application (2) Pause/Resume
Collecting Data
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Various Readings Displayed on Mobile Application (3) Stretch Goal - Saved Data Page
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Various Readings Displayed on Mobile Application (4) Activity Sketches (3rd Screen)
Experiment Details
V/I Data
Charge Data + Buttons
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SOW (Main Goals) Analog Switch in Coulometer replaced by Digital Switch NPN Transistor
Data communicated from the coulometer to a cell phone Arduino Uno Module + BLE Module
Various readings displayed on Mobile Application Android App Displays: 1. Interval X Voltage, 2. Interval X Current, 3. Interval X Charge
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Things to work on...
Digital Switch needs to be implemented...
Test Application (Fix Discrepancy between Multimeter and App)
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Stretch Goals Improve constant current circuit to make current as a f(time)
Compute concentration of electrons in the acid
Display system in a clear case/prototype stage
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Our Stretch Goals Save/Store/View Data, all marked by timestamps Display I, V, Charge when user hits 'Stop'
Display total duration of each test
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Gantt Chart Update
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Sources Swim, James, Edward Earps, and David Paul. Constant-Current Coulometric Titration of Hydrochloric Acid. Tech. no. 7, Pg 680. Vol. 73. University of Arkansas: Department of Chemistry, July 1996. Print.
" Coulometric Titration of HCL" Experimental Guidelines - Dr. Skip Pomeroy
Various readings displayed on Mobile Application. Android App Displays: 1. Interval X Voltage, 2. Interval X Current, 3. Interval ... Page 10. BJT Switch On. 10 ...
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