The most recent version of this page is a draft.
This version (24 Aug 2023 08:02) was approved by Zuedmar Arceo.
This version (24 Aug 2023 08:02) was approved by Zuedmar Arceo.This is an old revision of the document!
Table of Contents
EVAL-CN0579-ARDZ Quad-Channel IEPE Vibration Sensor Measurement System User Guide
Condition-based monitoring (CbM) enables early detection and diagnosis of machine and system abnormalities. Identifying and isolating these issues creates opportunities for optimizing replacement part inventories, scheduling downtime for planned maintenance, and making run-time process adjustments that can extend the life of equipment.
The reference design shown is a 4-channel, high resolution, wide bandwidth, high dynamic range, IEPE-compatible interface data acquisition (DAQ) system that interfaces with IC piezoelectric (ICP®)/IEPE sensors. While most solutions that interface with piezoelectric sensors in the market are AC-coupled and lack DC and subhertz measurement capabilities, this solution is DC-coupled. By looking at the complete data set from an IEPE vibration sensor in the frequency domain (DC to 50 kHz), the type and source of a machine fault can be better predicted using the position, amplitude, and number of harmonics found in the fast Fourier transform (FFT) spectrum.
Hardware
Primary side
Sensor Input
The main input on the CN0579 are right-angle SMA connectors on the primary side of the board, as such it is highly recommended to connect the sensor using an SMA cable. If this is not possible, due to the type of sensor or otherwise, there is also the headers which can be connected to with standard wires.
Current source jumper
The EVAL-CN0579-ARDZ includes solder jumpers to control current source. The jumpers connects the current source to the circuit and may be removed for testing without a current source.
LED Indicators
The PWR LEDs (DS1-DS2) are in the bottom-left corner indicates if the board is currently powered. The FAULT LEDs (DS3-DS6) are located near each SMA connector and indicates whether or not the switch's fault flag is raised. The yellow SHUTDOWN LED (DS7) located at left side of U19 which indicates if shutdown logic/ buffer, FDA, SW disable are enabled.
Secondary side
Arduino Interface
All connector pinouts for the EVAL-CN0579-ARDZ are described in the table below.
| Connector | Pin No. | Pin Name | CN0579 Pin Function |
|---|---|---|---|
| Arduino DIO 1 (P12) | 1 | SCL | SCL |
| 2 | SDA | SDA | |
| 3 | AREF | NC (Not connected) | |
| 4 | GND | GND | |
| 5 | 13 / SCLK | SCLK | |
| 6 | 12 / MISO | MISO | |
| 7 | 11 / PWM / MOSI | MOSI | |
| 8 | 10 / PWM / CS | CS_ADC | |
| 9 | 9 / PWM | DRDY_N | |
| 10 | 8 | DCLK | |
| Arduino DIO 0 (P14) | 1 | 7 | DOUT0 |
| 2 | 6 / PWM | DOUT1 | |
| 3 | 5 / PWM | DOUT2 | |
| 4 | 4 | DOUT3 | |
| 5 | 3 / PWM | SHUTDOWN_N | |
| 6 | 2 | RESET_N | |
| 7 | TX | NC | |
| 8 | RX | NC | |
| Arduino Analog (P13) | 1 | AIN0 | NC |
| 2 | AIN1 | NC | |
| 3 | AIN2 | NC | |
| 4 | AIN3 | NC | |
| 5 | AIN4 | NC | |
| 6 | AIN5 | NC | |
| Arduino Power (P11) | 1 | NC | NC |
| 2 | IOREF | IOREF | |
| 3 | RESET | NC | |
| 4 | 3.3V | 3V3 | |
| 5 | 5V | 5V | |
| 6 | GND | GND | |
| 7 | GND | GND | |
| 8 | Vin | NC |
To achieve reasonable noise measurements, the piezo accelerometer must be either stabilized using an active shaker table which cancels environmental vibrations or anchored to a massive object which makes sensor still. Anchoring to a massive object was used for a following measurements, where the piezo accelerometer was connected directly to the input of the signal chain.
Test Points
The board also has many test points, most of which are labelled and are fairly self-explanatory. The table below describes some of the most significant test points and their connections.
| Test Point | Description |
|---|---|
| 26V8 | Connects to the 26.8V rail before it's reduced to 26V. |
| 26V0 | Connects to the 26V rail. |
| 5V5 | Connects to the 5.5V rail before it's reduced to 5V. |
| 5V0 | Connects to the 5V rail. |
| TP1 | Connects to the voltage reference of the DAC for IEPE sensor. |
| TP6 / TP11 / TP16 / TP21 | Connects to signal chain after passing through the fault protection switch |
| TP7 / TP12 / TP17 / TP22 | Connects to VOCM. |
| TP8 / TP13 / TP18 / TP23 | Connects to signal chain that is level shifted. |
| TP9 / TP14 / TP19 / TP24 | Connects to FDA_OUT_N0 of the ADC driver. |
| TP10 / TP15 / TP20 / TP25 | Connects to FDA_OUT_P0 of the ADC driver. |
| TP27 / TP29 / TP31 / TP33 | Connects to output from the bias voltage correction. |
| TP34 | Connects to ADC reference buffer. |
| TP35 | Connects to differential conversion reference buffer output / VOCM. |
| TP36 | Connects to 32.768MEGHz clock output. |
| TP37 | Connects to VCM of ADC. |
General Setup Using DE10-Nano
Required equipment
The following is the list of items needed in order to replicate this demo.
Hardware:
-
- 5V/2A Wall Power supply with barrel jack (comes with DE10-Nano)
- mini USB to USB Type A (comes with DE10-Nano)
- Class 10 16GB SD Card with boot files in cn0579_boot_files.zip
- Ethernet cable
- IEPE Compatible Sensor
Software:
Block Diagram
Software setup
Preparing the SD Card
To prepare the SD-card for the DE10-Nano board:
- Validate, Format, and Flash the SD Card
Download and Install IIO-Oscilloscope
- Down the latest IIO-Oscilloscope release from Github, and install it on your PC. (You may need to right-click the installer, and run as “Elevated” in order to get it to install. )
- Once microSD card has been imaged, safely remove the hardware from the SD card writer, and insert the card directly into the microSD card slot on the DE10-Nano.
Hardware setup
- Mount the EVAL-CN0579-ARDZ on the DE10 Nano.
- Connect the monitor to the DE10 Nano using HDMI cable.
- Connect a OTG to USB connector to- USB OTG of DE10 Nano. If necessary, connect the USB hub to the USB-OTG connector.
- Connect the keyboard and mouse USB dongle to the USB OTG adapter/USB hub.
- Plug the power cable of the DE10 Nano.
- Wait for the system to boot up. Upon boot up, screen like image below will appear.
General Setup Using Cora Z7
Required equipment
The following is the list of items needed in order to replicate this demo.
Hardware:
- Ethernet cable
- Micro USB to USB Type A cable
- IEPE Compatible Sensor
Software:
Block Diagram
Software setup
Preparing the SD Card
To prepare the SD-card for the DE10-Nano board:
- Validate, Format, and Flash the SD Card
Download and Install IIO-Oscilloscope
- Down the latest IIO-Oscilloscope release from Github, and install it on your PC. (You may need to right-click the installer, and run as “Elevated” in order to get it to install. )
- Once the microSD card has been imaged, safely remove the hardware from the SD card writer, and insert the card directly into the microSD card slot on the DE10-Nano.
Hardware setup
- Mount the EVAL-CN0579-ARDZ on the Cora Z7.
- Connect ethernet cable on the Cora Z7 and on your PC.
- Power up Cora Z7 by plugging its power supply or connecting microUSB.
- Wait for the system to boot up. Upon boot up, open command terminal or any similar applications like PuTTy to communicate with the board.
Application Software
The CN0579 is supported by the Libiio library. This library is cross-platform (Windows, Linux, Mac) with language bindings for C, C#, Python, MATLAB, and others. Two easy to examples that can be used with the EVAL-CN0579-ARDZ are:
Connection
To be able to connect your device, the software must be able to create a context. The context creation in the software depends on the backend used to connect to the device as well as the platform where the EVAL-CN0579-ARDZ is attached. The platforms currently supported for the CN0579 are Cora-Z7 and DE-10 Nano using the ADI Kuiper Linux. The user needs to supply a URI which will be used in the context creation. The Libiio is a library for interfacing with IIO devices.
Install the Libiio package on your machine.
The iio_info command is a part of the libIIO package that reports all IIO attributes.
Upon installation, simply enter the command on the terminal command line to access it.
For Windows machine connected to ZedBoard via Ethernet cable:
Using SSH Terminal Software:
Open SSH Terminal Software (PuTTY, TeraTerm, or similar). The user should now start the PuTTY application and enter certain values in the configuration window. In the terminal, run:
analog@analog:~$ iio_info -u ip:<ip_address>
Using command terminal:
iio_info -s
Prompting this on the command terminal in your Windows PC will give you the IP address to access the EVAL-CN0579-ARDZ.
ssh analog@<ip_address>
analog@analog:~$ iio_info -u ip:<ip_address>
IIO Commands
There are different commands that can be used to manage the device being used. The iio_attr command reads and writes IIO attributes.
analog@analog:~$ iio_attr [OPTION]...
Example:
- To look at the context attributes, enter this code on the terminal:
analog@analog:~$ iio_attr -a -C
IIO Oscilloscope
Make sure to download/update to the latest version of IIO-Oscilloscope.
https://github.com/analogdevicesinc/iio-oscilloscope/releases
- Once done with the installation or an update of the latest IIO-Oscilloscope, open the application. The user needs to supply a URI which will be used in the context creation of the IIO Oscilloscope and the instructions can be seen in the previous section.
- Press refresh to display available IIO Devices, once cn0579 appeared, press connect.
Debug Panel
Below is the Debug panel of ltc2387 wherein you can directly access the attributes of the device.
DMM Panel
Access the DMM panel to see the instantaneous reading of the ADC voltages.
Pyadi-IIO
PyADI-IIO is a Python abstraction module for ADI hardware with IIO drivers to make them easier to use. This module provides device-specific APIs built on top of the current libIIO Python bindings. These interfaces try to match the driver naming as much as possible without the need to understand the complexities of libIIO and IIO.
Running the Example
After installing and configuring PYADI-IIO on your machine, you are now ready to run Python script examples. In our case, run the cn0579_example.py.
- Connect the CN0579 to the DE10 Nano or Cora Z7.
- Open command prompt or terminal and navigate through the examples folder inside the downloaded or cloned pyadi-iio directory.
- Run the example script using the command.
.../pyadi-iio/examples $ python3 cn0579_example.py
The expected output should look like this:
Without input signal:
With input from ADALM2000 (1Vpp, 1kHz) on Channel 0:
Github link for the Python sample script: CN0579 Python Example
Reference Demos & Software
More Information and Useful Links
Schematic, PCB Layout, Bill of Materials
EVAL-CN0579-ARDZ Design & Integration Files
- Schematics
- PCB Layout
- Bill of Materials
- Allegro Project
Registration
Receive software update notifications, documentation updates, view the latest videos, and more when you register your hardware. Register to receive all these great benefits and more!
End of Document
/srv/wiki.analog.com/data/pages/resources/eval/user-guides/circuits-from-the-lab/cn0579.txt · Last modified: 04 Sep 2023 05:26 by Joyce Velasco