EVAL-CN0216-ARDZ

EVAL-CN0216-ARDZ Datasheet

CN0216 Shield Evaluation Board User Guide

Part	Datasheet
EVAL-CN0216-ARDZ	EVAL-CN0216-ARDZ (pdf)

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One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106 • Tel • Fax • CN0216 Shield Evaluation Board User Guide Overview CN-0216 is a precision weigh scale signal conditioning system. It uses the AD7791, a low power buffered 24-bit sigma-delta ADC along with dual external ADA4528-2 zero-drift amplifiers. This solution allows for high dc gain with a single supply. Ultralow noise, low offset voltage, and low drift amplifiers are used at the front end for amplification of the low-level signal from the load cell. The circuit yields bit noise-free code resolution for a load cell with a full-scale output of 10 mV. This circuit allows great flexibility in designing a custom low-level signal conditioning front end that gives the user the ability to easily optimize the overall transfer function of the combined sensor-amplifier-converter circuit. The AD7791 maintains good performance over the complete output data range, from Hz to 120 Hz, which allows it to be used in weigh scale applications that operate at various low speeds. The EVAL-CN0216-ARDZ evaluation board is compatible with the Arduino Shield form factor. This user guide will discuss how to use the evaluation software to collect data from the EVAL-CN0216-ARDZ Evaluation Board CN-0216 Board Required Equipment q EVAL-CN0216-ARDZ Evaluation Board q Arduino Processor Board Uno/Mega 2560/Leonardo or Similar q LINX Firmware loaded on the Arduino q CN0216 Shield Evaluation Software q PC with the following Minimum Requirements r Windows Vista/7 32-bit r USB type A Port r Processor rated at 1GHz or faster r 1GB RAM and 500 MB available hard disk space q Tedea Huntleigh Model 1042 Load Cell NOTE - Any 4 or 6 wire load cells can be used with the CN-0216 Board. This guide was written with the Tedeah Huntleigh Model 1042 in mind. General Setup q The EVAL-CN0216-ARDZ CN-0216 Shield Board connects to a Shield form factor Arduino Board q Power the system through the Arduino using an external wall wart 7V-12V recommended for best performance q Connect the system to the PC using a USB cable q The Tedeah Huntleigh Model 1042 load cell connects to the EVAL-CN0216-ARDZ via the 8 pin header Jumper Settings q “0” Position shown below r P2 - Connects REFIN+ to Sensor +Sense pin r P3 - Connects REFIN- to Sensor -Sense pin q “1” Position r P2 - Connects REFIN+ to 5V supply r P3 - Connects REFIN- to GND Installing the Software Extract the file CN0216 Eval Software.zip and open the file setup.exe. NOTE It is recommended that you install the CN0216 Shield Evaluation Software to the default directory path and all National Instruments products to Click Next to start the installation Click Finish to complete the installation. Please make sure Arduino USB drivers are installed and your Arduino processor board is flashed with the latest LINX Firmware Connecting the Hardware Connect the Tedeah-Huntleigh Model 1042 Load Cell to 8-pin header of the EVAL-CN0216-ARDZ CN-0216 Board as depicted below. NOTE If a different Load Cell is used other than the Tedeah-Huntleigh Model 1042, the wiring schematic will be different! Using the Evaluation Software Software Controls and Indicators Description Run r When this button is pressed, the system start collecting ADC Data and presents it in the display and chart Stop r When this button is pressed, the systems stops/pauses data acquisiton Clear Chart r When this button is pressed, data in the chart is cleared/erased Save Data r When this button is pressed, it opens a prompt to allow the user to save data to a spreadsheet Calibration Weight r Allows the user to specify the calibration weight used in grams Calibrate r When this button is pressed, it will start the calibration process and give the user instructions on how to proceed ADC Mode Radio Buttons r This control is used to set the mode of the AD7791. The default value is Unbuffered Mode and is highlighted in bold on the Calibrate System Tab. s Buffered Mode - Selecting this mode turns the on-chip analog input channel buffer of the AD7791 ON. s Unbuffered Mode - Selecting this radio button turns the on-chip analog input channel buffer of the AD7791 OFF. ADC Channel Select Radio Buttons r This control is used to select the analog input channel of the AD7791 for conversion. The default value is AIN + -AIN - and is highlighted in bold on the Calibrate System Tab. s AIN + -AIN - - Selecting this radio button allows for normal operation of the AD7791. s AIN - -AIN - - Selecting this radio button shorts the analog input channels of the AD7791. s Vdd Monitor - Selecting this radio button monitors the voltage applied to the Vdd pin of the AD7791. The voltage is attenuated by 5 and the resultant voltage is applied to the modulator using an internal V reference for analog to digital conversion. Update Rate Radio Buttons r This control is used to change the output word rate of the AD7791. The default value is Hz and is highlighted in bold on the Calibrate System Tab. Configure ADC Button r When this button is pressed the current value of the ADC Mode Radio Buttons, ADC Channel Select Radio Buttons, and Update Rate Radio Buttons are used to configure the AD7791. System Status String Indicator r This indicator displays a message to the user detailing the current state of the software. System Status LED Indicator r This indicator displays the current state of the software in the form of an LED. There are three status LED colors. Inactive Busy Error Current Weight Numerical Indicator r This indicator displays the mass in grams on the load cell. Weight/Code Chart r This indicator displays the data in chart form. Chart Controls r These controls allow the user to zoom-in, zoom-out, and pan through the data collected. Select Units Radio Buttons r This control determines the Y-Axis units of the data displayed in the chart. More Information q CN-0216 Webpage q CN0216 Shield Evaluation Software q AD7791 Product Page q ADA4528-2 Product Page q Arduino Official Website q LINX Firmware Download

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One Technology Way
• P.O. Box 9106
• Norwood, MA 02062-9106
• Tel
• Fax
•

CN0216 Shield Evaluation Board User Guide

Overview

CN-0216 is a precision weigh scale signal conditioning system. It uses the AD7791, a low power buffered 24-bit sigma-delta ADC along with dual external ADA4528-2 zero-drift amplifiers. This solution allows for high dc gain with a single supply. Ultralow noise, low offset voltage, and low drift amplifiers are used at the front end for amplification of the low-level signal from the load cell. The circuit yields bit noise-free code resolution for a load cell with a full-scale output of 10 mV. This circuit allows great flexibility in designing a custom low-level signal conditioning front end that gives the user the ability to easily optimize the overall transfer function of the combined sensor-amplifier-converter circuit. The AD7791 maintains good performance over the complete output data range, from Hz to 120 Hz, which allows it to be used in weigh scale applications that operate at various low speeds. The EVAL-CN0216-ARDZ evaluation board is compatible with the Arduino Shield form factor. This user guide will discuss how to use the evaluation software to collect data from the EVAL-CN0216-ARDZ Evaluation Board CN-0216 Board

Required Equipment
q EVAL-CN0216-ARDZ Evaluation Board q Arduino Processor Board Uno/Mega 2560/Leonardo or Similar q LINX Firmware loaded on the Arduino q CN0216 Shield Evaluation Software q PC with the following Minimum Requirements
r Windows Vista/7 32-bit r USB type A Port r Processor rated at 1GHz or faster r 1GB RAM and 500 MB available hard disk space q Tedea Huntleigh Model 1042 Load Cell

NOTE - Any 4 or 6 wire load cells can be used with the

CN-0216 Board. This guide was written with the Tedeah Huntleigh Model 1042 in mind.

General Setup
q The EVAL-CN0216-ARDZ CN-0216 Shield Board connects to a Shield form factor Arduino Board q Power the system through the Arduino using an external wall wart 7V-12V recommended for best
performance q Connect the system to the PC using a USB cable q The Tedeah Huntleigh Model 1042 load cell connects to the EVAL-CN0216-ARDZ via the 8 pin header Jumper Settings q “0” Position shown below
r P2 - Connects REFIN+ to Sensor +Sense pin r P3 - Connects REFIN- to Sensor -Sense pin
q “1” Position r P2 - Connects REFIN+ to 5V supply r P3 - Connects REFIN- to GND

Installing the Software

Extract the file CN0216 Eval Software.zip and open the file setup.exe. NOTE It is recommended that you install the CN0216 Shield Evaluation Software to the default directory path and all National Instruments products to

Click Next to start the installation

Click Finish to complete the installation. Please make sure Arduino USB drivers are installed and your Arduino processor board is flashed with the latest LINX Firmware

Connecting the Hardware

Connect the Tedeah-Huntleigh Model 1042 Load Cell to 8-pin header of the EVAL-CN0216-ARDZ CN-0216 Board as depicted below. NOTE If a different Load Cell is used other than the Tedeah-Huntleigh Model 1042, the wiring schematic will be different!

Using the Evaluation Software

Software Controls and Indicators Description

Run r When this button is pressed, the system start collecting ADC Data and presents it in the display and chart

Stop r When this button is pressed, the systems stops/pauses data acquisiton

Clear Chart r When this button is pressed, data in the chart is cleared/erased

Save Data r When this button is pressed, it opens a prompt to allow the user to save data to a spreadsheet

Calibration Weight r Allows the user to specify the calibration weight used in grams

Calibrate r When this button is pressed, it will start the calibration process and give the user instructions on how to proceed

ADC Mode Radio Buttons r This control is used to set the mode of the AD7791. The default value is Unbuffered Mode and is
highlighted in bold on the Calibrate System Tab. s Buffered Mode - Selecting this mode turns the on-chip analog input channel buffer of the AD7791 ON. s Unbuffered Mode - Selecting this radio button turns the on-chip analog input channel buffer of the AD7791 OFF.

ADC Channel Select Radio Buttons r This control is used to select the analog input channel of the AD7791 for conversion. The default value is AIN + -AIN - and is highlighted in bold on the Calibrate System Tab. s AIN + -AIN - - Selecting this radio button allows for normal operation of the AD7791. s AIN - -AIN - - Selecting this radio button shorts the analog input channels of the AD7791. s Vdd Monitor - Selecting this radio button monitors the voltage applied to the Vdd pin of the AD7791. The voltage is attenuated by 5 and the resultant voltage is applied to the modulator using an internal V reference for analog to digital conversion.

Update Rate Radio Buttons r This control is used to change the output word rate of the AD7791. The default value is Hz and is highlighted in bold on the Calibrate System Tab.

Configure ADC Button r When this button is pressed the current value of the ADC Mode Radio Buttons, ADC Channel Select Radio Buttons, and Update Rate Radio Buttons are used to configure the AD7791.

System Status String Indicator r This indicator displays a message to the user detailing the current state of the software.

System Status LED Indicator r This indicator displays the current state of the software in the form of an LED. There are three status LED colors. Inactive Busy Error

Current Weight Numerical Indicator r This indicator displays the mass in grams on the load cell.

Weight/Code Chart r This indicator displays the data in chart form.

Chart Controls r These controls allow the user to zoom-in, zoom-out, and pan through the data collected.

Select Units Radio Buttons r This control determines the Y-Axis units of the data displayed in the chart.

More Information
q CN-0216 Webpage q CN0216 Shield Evaluation Software q AD7791 Product Page q ADA4528-2 Product Page q Arduino Official Website q LINX Firmware Download

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Datasheet ID: EVAL-CN0216-ARDZ 517892