Related Manuals for GSS CozIR-LP3
Summary of Contents for GSS CozIR-LP3
- Page 1 CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 CozIR®-LP3 Evaluation Board User Guide Page | 1 For regular updates, go to https://gassensing.co.uk...
-
Page 2: Table Of Contents
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 TABLE OF CONTENTS INTRODUCTION ..........................4 USB DRIVER ............................ 5 SOFTWARE INSTALLATION ......................5 INSTALLING THE SENSOR ........................ 5 EVALUATION BOARD CONCEPT ....................... 6 STANDALONE OPERATION ......................8 SENSOR POWER SUPPLY ......................... 9 Method 1 - External Power Supply ..................... - Page 3 CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 DATA DISPLAY ..........................27 DATALOGGING ..........................29 TERMINAL VIEW ........................... 31 TERMINAL VIEW – UART READ ...................... 32 TERMINAL VIEW – UART WRITE ....................33 TERMINAL VIEW – I C WRITE ......................34 TERMINAL VIEW –...
-
Page 4: Introduction
Revision 1.5: 15 December 2020 INTRODUCTION This evaluation board is designed to provide a fast and easy start for evaluation of the GSS CozIR®- LP3 sensor. The evaluation board brings several interfaces and interconnections shown in Figure 1. The CozIR®-LP3 Evaluation Board is designed to allow the user to evaluate all the hardware and software functions of the sensor. -
Page 5: Usb Driver
Choose “VCP Drivers” and select the correct driver for your operating system. SOFTWARE INSTALLATION The GSS evaluation board software is available direct from the GSS web site. Download the .zip file to your computer. Unzip and click on Setup.exe and follow the instructions on the screen. -
Page 6: Evaluation Board Concept
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 EVALUATION BOARD CONCEPT Figure 1: Evaluation Board Key Components The evaluation board consists of a USB interface device, which connects to an on-board micro-controller. The on-board microcontroller connects to the sensor using either its UART or I C interface. - Page 7 CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 Figure 2: Top Side Evaluation Board Figure 3: Bottom Side Evaluation Board Page | 7 For regular updates, go to https://gassensing.co.uk...
-
Page 8: Standalone Operation
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 STANDALONE OPERATION The sensor can be completely isolated from the rest of the evaluation board electronics. This allows the user to conveniently control the sensor directly via edge connectors J3, J4 and J5. To operate in this manner, the DIP switches (S5) must be set to isolate the sensor from the microcontroller by putting them into the off position. -
Page 9: Sensor Power Supply
If the sensor is to be evaluated in isolation and separately from the evaluation board USB interface and software, it must be provided with power. There are three methods to provide power to the sensor. Note the sensor must be powered via the USB interface if the GSS evaluation software is to be used. -
Page 10: Method 3 - Variable External Power Supply
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 Method 3 - Variable External Power Supply The user can also drive the sensor directly with an external power supply, bypassing the on-board low noise LDO and FET switch. This allows the user to evaluate the behaviour of the sensor with different supply voltages or power sources. - Page 11 CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 NAME TYPE DESCRIPTION I2C_SCL Digital Input C serial clock input. Open drain, external 3.3kΩ resistor pulled high to VDD required I2C_SDA Digital C serial data input/output. Open drain, external Input/Output 3.3kΩ...
-
Page 12: Sensor Power Consumption Measurement
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 SENSOR POWER CONSUMPTION MEASUREMENT The sensor evaluation board contains circuitry to allow the user to accurately measure sensor current consumption. A high-precision, high-side current-sense amplifier is used to measure the current through a 1.5ohm resistor R6. -
Page 13: Software User Interface
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 SOFTWARE USER INTERFACE All the main sensor and evaluation board functions are controlled through a single user interface, displayed above. Hovering over a button will display the tips for that function. Page | 13 For regular updates, go to https://gassensing.co.uk... -
Page 14: Running The Software
RUNNING THE SOFTWARE The software may start automatically after installation. If it does not, you can start it from the “Program” Menu in the Start Menu. Look for the filename GSS Customer Evaluation Board. The opening screen is below. To connect to the sensor, select the correct COM port from the drop-down Connection list, then click the CONNECT button. -
Page 15: Sensor Selection
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 SENSOR SELECTION Select the correct sensor type and the full-scale range (CO ppm) of the sensor. The sensor should automatically start to take CO measurements after 2-3 seconds. These measurements are shown graphically in the middle of the screen. -
Page 16: Co 2 Sensor Measurement Mode
Revision 1.5: 15 December 2020 SENSOR MEASUREMENT MODE GSS CO sensors have several measurement modes. The number and type of modes available depend on the sensor and the digital interface mode. Select the ‘Mode’ using one of the 3 buttons. -
Page 17: Uart Communications Mode
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 UART Communications Mode When the UART interface is chosen, all three measurement modes are available. By default, except for the Blink range of products, after power-on, the sensor will automatically start taking measurements in ‘Continuous’... -
Page 18: Other Environmental Sensors
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 OTHER ENVIRONMENTAL SENSORS The evaluation board also contains on-board temperature, humidity, pressure and current sensors. These can be set to take measurements automatically at a pre-set period or set to take readings manually. - Page 19 CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 The current measurement function behaves slightly differently to the other sensors. The ‘Average Current’ displayed in the lower centre of the screen is the average current consumed by the sensor over a single reading period.
-
Page 20: Graphing Sensor Data
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 GRAPHING SENSOR DATA The user can graph sensor data. Click on the appropriate sensor box to graph the data in the upper central area of the user interface. Note, only one sensor can be graphed at a time. The graph update rate is set to the measurement rate, defined by the ‘Polling’... -
Page 21: Zero-Point Setting The Sensor
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 ZERO-POINT SETTING THE SENSOR There are a several methods available to the user to set the zero point of the sensor. In all cases, the best zero is obtained when the gas concentration is stable, and the sensor is at a stable temperature. Note the zero-point settings are not cumulative and only the latest zero-point setting is effective. -
Page 22: Zero In A Known Gas Concentration
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 diffused into the sensor. If there is no value in the ‘Set to’ dialogue box, when ‘Ambient’ is clicked, the sensor will be zeroed assuming the ambient environment is 400ppm. The CO concentration fresh air zero level is programmable over a range from 0ppm to the full scale of the sensor. -
Page 23: Auto-Zero Level
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 AUTO-ZERO LEVEL The background concentration will depend on sensor location. Ambient levels are typically in the range of 400ppm - 450ppm. The factory default is set to 400ppm. The user can change the background ambient level used for auto-zeroing. -
Page 24: Pressure Compensation
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 PRESSURE COMPENSATION GSS sensors are calibrated at a nominal 1013mbar. The CO reading from the sensor will vary from the nominal output if the mean barometric pressure is different from the calibration setting. -
Page 25: Digital Filter Setting
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 DIGITAL FILTER SETTING measurements are filtered by default. The digital filter value can be varied between 1-256. If set to 1, there is no digital filtering. The default value is 16. Reducing the digital filtering increases sensor response rate at the expense of measurement noise. -
Page 26: Sensor Communications
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 SENSOR COMMUNICATIONS The sensor has two control interface modes. To ensure the sensor behaviour is representative of real-world use, the evaluation board microprocessor will communicate with the sensor in either UART or I C mode dependent on this setting. -
Page 27: Data Display
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 DATA DISPLAY Essential sensor data is displayed numerically in the lower half of the user interface. Sensor Data Type Description Units Sensor ID No. Unique sensor ID concentration Temperature Ambient temperature °C Pressure Ambient pressure... - Page 28 CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 Sensor Data Type Description Units Mode Measurement mode Poll Period Measurement update period Seconds Filter Digital filter setting Decimal Last Zero Value Value used to re-zero the sensor Pressure Comp Pressure value used by CO sensor mbar...
-
Page 29: Datalogging
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 DATALOGGING and other sensor data can be recorded. To initiate the recording process, click ‘Record’. To stop the recording process, click ‘Stop’. Clicking on ‘Record’ brings up the following screen. Page | 29 For regular updates, go to https://gassensing.co.uk... - Page 30 The data will be recorded as a .csv file that can subsequently be opened in a spreadsheet program. The sensor data will be timestamped, allowing easy analysis of all environmental parameters. The measurement period for each sensor type follows the settings on the user interface. Recorded by GSS Sensor Evaluation Board 16/11/2020 13:02 437674...
-
Page 31: Terminal View
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 TERMINAL VIEW Access to all CO sensor functions and register settings are available to the user using the Terminal View. Terminal View allows the user to read and write directly to the CO sensor. -
Page 32: Terminal View - Uart Read
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 TERMINAL VIEW – UART READ To open the terminal window for UART communications, first ensure that ‘UART Comms’ has been selected under the ‘Communications’ menu. To read a value, write the command into the dialogue box, and click ‘Send. In this example, the Command ‘*’... -
Page 33: Terminal View - Uart Write
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 TERMINAL VIEW – UART WRITE Write the command into the dialogue box and click ‘Send. In this example, the X Command is shown. X is the command to zero the sensor in a known gas concentration, in this case 1000ppm. Sending a command followed by an integer (X 1000 in this case) will write the value into the appropriate register. -
Page 34: Terminal View - I 2 C Write
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 TERMINAL VIEW – I C WRITE To open the terminal window for I C communications, first ensure that ‘I C Comms’ has been selected under the ‘Communications’ menu. To write to an I C register, the instruction must be formatted correctly. -
Page 35: Terminal View - I 2 C Read
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 TERMINAL VIEW – I C READ To read from an I2C register, the instruction is formatted as “%rd” followed by the number of bits to read as noted in the datasheet, followed by the register number in decimal. For example: “%rd16 2”... - Page 36 CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 The “%” in the I C commands denotes to the evaluation board that a special command that must be pre-processed before passing on to the sensor. If the interface is set to I C mode, and if the % is missing, the evaluation board assume the command is a UART command and sending it on to the sensor will return a timeout.
-
Page 37: Mechanical Diagram
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 MECHANICAL DIAGRAM Page | 37 For regular updates, go to https://gassensing.co.uk... -
Page 38: Important Notice
GSS is not liable for applications assistance or customer product design. The customer is solely responsible for its selection and use of GSS products. GSS is not liable for such selection or use nor for use of any circuitry other than circuitry entirely embodied in a GSS product. -
Page 39: Revision History
CozIR®-LP3 Evaluation Board User Guide Revision 1.5: 15 December 2020 REVISION HISTORY DATE RELEASE DESCRIPTION OF CHANGES PAGES 21/07/2020 1.0 First revision 20/10/2020 1.1 Full first draft 13/11/2020 1.2 Updates 25/11/2020 1.3 Final UI 5/12/2020 First formal release 15/15/2020 1.5 Mechanical Diagram and Pin Out Pg 37 Description...
Need help?
Do you have a question about the CozIR-LP3 and is the answer not in the manual?
Questions and answers