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EVAL-CN0428-EBZ Overview
Boards Used
Features
Documents Needed
Software Needed
General Setup
Equipment Required
Equipment Recommended
Setup
Hardware Setup
BNC Sensor Probe
Connectors
RCA Sensor Probe
Connectors
Switch Configurations
Header
Surface Mount Interface
Connector
Stand Alone Mode for
EVAL–ADICUP3029 Board
Software Setup
Programming the EVAL-
ADICUP3029 Board
Setting up the Serial
Terminal Software to
Communicate with the
Boards
Programming the CN0428
IDE Setup
Schematic, PCB Layout, Bill of
Materials
Software
This version (07 Dec 2018 19:20) was approved by sshaikh2.
The Previously approved version (07 Dec 2018 17:00) is available.
EVAL-CN0428-EBZ Overview
Many important liquid analyses like pH rely on electrochemistry, a branch of chemistry that
characterizes the behavior of reduction-oxidation (redox) reactions by measuring the transfer of
electrons from one reactant to another. Electrochemical techniques can be used directly or indirectly
to detect several important parameters that affect water quality, including chemical indicators,
biological and bacteriological indicators and even some low level contaminants like heavy metals.
Many of these indicative measurements are pertinent to determining important quality parameters of
the tested analyte.
The CN0428 circuit shown is a modular sensing platform that allows the user to design a flexible
electrochemical water quality measurement solution. Its high level of integration enables an
electrochemical measurement platform applicable to a variety of water quality probes including pH,
oxidation reduction potential (ORP), and conductivity cells.
The system allows up to four probes to be connected at one time for different water quality
measurements.
Boards Used
Following are the three boards used for setting up the Water Quality Measurement System:
EVAL-M355-ARDZ-INT Arduino Shield Board
EVAL-ADICUP3029 Board
Features
Capable of measuring pH, Conductivity, Temperature and ORP of a solution
The board can be configured for customized measurements such as Dissolved Oxygen (DO) measurement, Ion Concentration
measurement, i.e., Ion Selective Electrode (ISE) measurement and many other water quality factors.
Up to 4 sensor boards can be connected for measurements simultaneously.
Temperature can be measured on one or all sensor boards.
Documents Needed
ADuCM355 Data Sheet
CN0428 Circuit Note
EVAL–ADICUP3029 User Guide
Software Needed
Serial Terminal Software (PuTTY, TeraTerm or similar)
IAR ARM 8.30.2 (Optional)
General Setup
Equipment Required
Hardware
EVAL-ADICUP3029 circuit board.
EVAL-M355-ARDZ-INT Arduino-compatible platform.
EVAL-CN0428-EBZ Water Quality Sensor Board loaded with firmware. (Up to 4)
PC with a USB port and Windows® 7 (32-bit) or higher.
USB type A to USB micro cable.
Test solutions.
BNC connectorized probe. (Up to 4)
(Optional) RCA connectorized temperature probe. (Up to 4)
(Optional) Beaker.
(Optional) Probe holder/stand.
(Optional) Calibration buffers for probe calibration.
Software
Serial terminal software. (PuTTY, Tera Term, or similar)
ADuCM302x_DFP.
CN0428 ADuCM355 Firmware.
ADICUP3029 Firmware.
Equipment Recommended
The following analog-output 2-electrode probes are recommended:
Cole-Parmer 100-series Replacement pH/Temperature Electrode
Cole-Parmer 100-series Replacement Conductivity/Temperature Probe, K=1
Sensorex S550C-ORP Heavy-Duty ORP Sensor
Setup
To set up the circuit for evaluation, consider the following steps:
1. Before plugging all boards together, user should ensure the switches are set correctly on the EVAL-ADICUP3029 board and EVAL-M355-
ARDZ-INT shield board as follows:
a. Power switch S5 set to “Wall/USB” and switch S2 to “USB” on the EVAL-ADICUP3029 board.
b. Switch S2 set to “I2C” on the EVAL-M355-ARDZ-INT shield board.
2. Before plugging the three boards together, mount the sensor board(s) and secure them with the included hardware as shown in the pictures.
This mounting should include two bolts, two standoffs and two nuts for each of the EVAL-CN0428-EBZ board. Use of the hardware mount for
the EVAL-CN0428-EBZ board is strongly recommended to ensure mechanical stability and to protect the Samtec connector on the bottom of
the board.
3. Mount up to four EVAL-CN0428-EBZ boards onto the EVAL-M355-ARDZ-INT shield board, using hardware as needed. Then plug the
EVAL-M355-ARDZ-INT shield board into the EVAL-ADICUP3029 board.
4. Choose the desired measurement probe and connect it to the EVAL-CN0428-EBZ board.
5. Ensure the switch setting on EVAL-CN0428-EBZ board is the correct configuration for desired measurement (refer to the Switch
Configurations section).
6. Connect the USB which will supply power to all boards.
7. Set the serial terminal software to match the setting of the EVAL-ADICUP3029 board's firmware and select the correct virtual COM port.
Ensure baud rate is set to 9600 bps (Refer to the Software Setup for Serial Terminal Software settings).
8. Once the serial terminal window comes up, type 'help' and hit enter. The software displays list of available commands for water quality
measurements.
Complete Board Setup
Hardware Setup
BNC Sensor Probe Connectors
The EVAL-CN0428-EBZ board has a 5-1634503-1 BNC connector by TE Connectivity LTD. It has a straight body style with vertical orientation.
The impedance offered by this connector is 50 Ohms. The sensor probe (pH sensor, conductivity sensor, etc.) with a BNC connector needs to be
plugged in and twisted clockwise to connect the senor with the board through this connector. The recommended BNC probes are:
Cole Palmer pH Probe
Cole Palmer Conductivity Probe
Sensorex ORP Probe
RCA Sensor Probe Connectors
The EVAL-CN0428-EBZ board also comes with a RCJ-023 RCA connector by Switchcraft. Just like the BNC, it also has a vertical orientation. A
wide variety of sensor probes come with a RCA jack to it along with the BNC connector. This jack plugs into the RCA connector to offer
temperature measurement as well as help with temperature error compensation.
Some of the common sensors that come with RCA connector are:
Cole Palmer pH Probe
Cole Palmer Conductivity Probe
Switch Configurations
Switch Configuration for EVAL-CN0428-EBZ Water Quality Board
There are 2 switches present on the EVAL-CN0428-EBZ board, namely switches S1 and S2. S1 is CAS-220TA switch, while S2 is CJS-1200TA
switch, both by by Nidec Copal Electronics.
The accurate position of these switches lets us choose the appropriate measurement condition, such as pH, Conductivity, ORP, etc. The options
available on S1 are 'pH' and 'Z', signifying voltage based measurements (for pH, ORP, etc.) and impedance based measurement (for conductivity,
electrochemical impedance spectroscopy sweep, etc.) respectively. Switch S2 offers 2 options to choose between 'INT' and 'Hi-Z', allowing the
user to choose between lower range impedance or higher range impedance. Also, while performing voltage based measurements, the position of
switch S2 does not matter. Summarizing these switch configurations, we get the following table:
Desired Measurement S1 Setting S2 Setting
pH, ORP, etc. pH n/a
Conductivity, Impedance, etc. with autoranging from 100 Ohms to 10 MOhms ZInt
Low Current Conductivity or Impedance greater than 200 KOhms ZHI-Z
Switch Configuration for EVAL-M355–ARDZ–INT Arduino Shield Board
There are two switches present on the EVAL-M355-ARDZ-INT board, namely switches S1 and S2. S1 is SS-44D04-G 4 switch, while S2 is
JS202011CQN switch, both by C&K.
Switch S2 has two options to choose from, namely the I2C and UART. It is recommended that this switch S2 remains in I2C mode as this will keep
the board in a default communication mode with the FW that ships with the system. Switching to the UART mode enables a communication
platform exclusively between the EVAL-M355-ARDZ-INT board and the EVAL–ADICUP3029 board. Switch S1 is a top slide switch and has 4
options, namely CH1, CH2, CH3 and CH4. It selects which channel is connected to the SWD programming port. It is also used to download the
firmware onto the EVAL-CN0428-EBZ water quality board.
Switch Configurations for EVAL–ADICUP3029 Board
There are 2 switches present on the EVAL–ADICUP3029 board, namely switches S2 and S5. S2 is JS203011CQN switch, while S5 is
JS202011CQN switch, both by C&K.
Switch S2 has 3 options, 'USB', 'Arduino' and 'WiFi. While in USB mode, the board communicates over the USB with the PC. This is the
recommended setting for water quality measurements. When the switch is on Arduino mode, it establishes a UART communication with the
Arduino chip on the board. WiFi mode, as the name suggests, allows the user to communicate with the board over WiFi with the help of an
external WiFi Board.
Switch S5 has two options, 'Wall/USB' and 'Battery'. These options allows the user to choose between powering the board using USB (choosing
Wall/USB on switch S5) or using 2 AAA Batteries (choosing Battery on switch S5).
Along with the switches, the EVAL-CN0428-EBZ has provision for a 2 - pin header. It is TSW-102-08-G-S by Samtec Inc, mounted vertically,
with a pitch of 0.100“ (2.54mm).
Header P3 is available to measure the temperature inputs for cases when an RCA plug or RCA adapter are not available.
Surface Mount Interface Connector
The EVAL-CN0428-EBZ also comes with a 14 pin male, surface mount connector at the bottom of the board. It is TFM-107-02-L-D by Samtec
Inc.
This connector connects the EVAL-CN0428-EBZ to the EVAL–M355–ARDZ–INT Arduino shield interface board.
Stand Alone Mode for EVAL–ADICUP3029 Board
More details about this option, and how to use it, can be found by looking at the Stand Alone Mode section.
Software Setup
Programming the EVAL-ADICUP3029 Board
Before setting up the Water Quality Measurement System, it is important to program the EVAL-ADICUP3029 board. The firmware required to
be flashed on this board is a .hex file which is available here. The user should download the .hex firmware file prior to flashing it on the board.
Following are the steps then required to be completed to set up the EVAL-ADICUP3029 board for Water Quality Measurements:
1. Plug the micro-USB from the PC into the EVAL-ADICUP3029 board. An orange LED should light on the EVAL ADICUP3029 board as shown
below.
Header
2. Download the mbed windows serial port driver. It should be an .exe file. Click on it after it downloads to run.
3. Once the pop-up appears, click on install.
4. The previous step was successful if there appears a DAPLINK device under 'This PC' in Windows File Explorer, as shown below.
5. Copy and Paste or Drag and Drop the .hex file onto the DAPLINK device/folder. This downloads the firmware on the EVAL-ADICUP3029
board.
6. The DAPLINK device should disappear momentarily and then reappear.
7. If the download fails, you will find a FAIL.TXT file on the DAPLINK device.
8. If the download is successful, the .hex file will disappear from the DAPLINK device and no FAIL.TXT file will be present.
9. Perform a hard reset by unplugging the micro-USB cable from the PC and then reconnect it again. This completes the firmware installation for
EVAL-ADICUP3029 board.
Setting up the Serial Terminal Software to Communicate with the Boards
The EVAL-CN0428-EBZ board comes with a pre-installed base code. The user needs to install a serial terminal software on their PC to
communicate with the board. The recommended software is PuTTY which is easily available over the internet for free installation. Once PuTTY is
installed, user needs to go to the Device Manager terminal through the Start option in Windows. The Device Manager terminal opens as follows:
The new options that appear in the Device Manager window, as shown in the picture above, shows that the PC has detected the EVAL–
ADICUP3029 board. User should note the port number of the USB Serial Device (COM4 as seen above). With a right click on the USB Serial
Device (COM4), user can then access the properties of the board connected. Note the speed shown here is 9600.
Once these steps have been followed, user should now start the PuTTY application and enter certain values in the configuration window. The
three important settings that needs to be defined in the configuration window are the Session settings, the Terminal settings and the Serial
settings. In the Session window, the speed should be set at 9600 and the serial line is the port number taken from Device manager (COM4 in our
case).
The user should save these settings by a particular name (we call it Water_qual) and load them whenever needed. Other important
configurations include the terminal settings and the connection serial settings. They should be set as follows before launching the Putty
application:
Once all the configurations have been defined, launch the PuTTY terminal by selecting the 'Open' option. After the PuTTY terminal launches,
type 'help' and hit enter on your keyboard to see the different commands in the PuTTY terminal for various water quality measurements. The list
of commands that appear in the PuTTY terminal are as follows:
Command Description
help Displays all the available commands.
sensortype Chooses the type of sensor that is connected. Default is pH sensor. But for measuring conductivity, user needs to type
'sensortype conductivity' to select the conductivity measurement after connecting the conductivity probe. Similarly
'sensortype ORP'for ORP measurement. And type 'sensortype ph' to return to pH mode measurements after connecting a
pH probe.
measuretemp Measures an prints current temperature value.
measuresensor Makes sensor measurement for configured sensor (pH, Conductivity, etc.)
measureeis Performs EIS sweep on sensor and estimates sensor health.
printhealth Prints sensor health value from last EIS measurement.
printtemp Prints the temperature of the last sensor measurement (it doesn't update any measurement before printing, but in turn
prints the last measured temperature).
printconfig Prints the configuration (sensortype, HiZmode, temperature enabled)
printserialnumber Prints the unique ID present on the EVAL-CN0428-EBZ board. This can be used to store calibraions.
enabletemp Calibrates selected channel or all channels. = 1 to enable and = 0 to disbale.
enablehizmode This command either enables or disables the high impedance TIA. Switch S2 on EVAL-CN0428-EBZ board matches this
setting. 'enablehizmode 1' = enable and 'enablehizmode <0>' = disable.
renamesensor Renames the selected channel or all channels. = new name (less than 16 characters).
switchsensor Switch to sensor board at . = 1, 2, 3, 4; Channel number of the sensor board to swith to.
Programming the CN0428
The Eval -CN0428-EBZ board ships with a dedicated firmware. However if the user wishes to modify the firmware for custom measurements,
they need to download and install IAR ARM 8.30.2 (or above) workbench. Along with this the user also needs to download the ADuCM355
support package, cut traces for the Serial Wire Debug (SWD) line (refer to the Stand Alone Mode for EVAL-ADICUP3029 board for more
details about this process) and use the included cable to connect the debugger to the shield board.
IDE Setup
1. Install IAR Embedded Workbench for ARM
Please visit https://www.iar.com/ to download IAR Embedded Workbench for ARM (version 8.30.2 or above)
2. License Installation
Once downloaded, the IAR window pops up as shown below. To activate the IAR workbench, click on the help tab.
Then select the License Manager option. This will open a tab asking the user to register for a license key.
When the user clicks on register, they are redirected to IAR website wherein they need to fill out their details to get access to a license
number. Upon successfully filling up the details, the user will receive a license number which has to be entered back in the tab above
then hit Next. This completes the IAR setup and the user can validate their IAR license by looking at this window that pops up in the
License Manager option now.
The user now needs to load the ADuCM355 support package and modify the code by reprogramming it. After cutting the traces and
programming the boards, the cable needs to be connected to the EVAL-ADICUP3029 board again to allow USB communication.
Further details of using IAR can be found here.
Schematic, PCB Layout, Bill of Materials
EVAL-CN0428-EBZ Design & Integration Files
Schematics
PCB Layout
Bill of Materials
Allegro Project
Software
CN0428 ADuCM355 Source Code
CN0428 ADICUP3029 Source Code
End of Document
resources/eval/user-guides/circuits-from-the-lab/cn0428.txt · Last modified: 07 Dec 2018 19:20 by sshaikh2
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