CozIR-Blink Sensor Evaluation Board User Guide
39Pages

CozIR®-Blink Evaluation Board User Guide Gas Sensing Solutions Ltd. Page | 1 For regular updates, sign up at https://gassensing.co.uk Revision 1.2, 29 March 2021 Copyright © 2021 Gas Sensing Solutions Ltd.

For regular updates, sign up at https://gassensing.co.uk Revision 1.2, 29 March 2021 Copyright © 2021 Gas Sensing Solutions Ltd.

Gas Sensing Solutions Ltd. Page | 3 For regular updates, sign up at https://gassensing.co.uk Revision 1.2, 29 March 2021 Copyright © 2021 Gas Sensing Solutions

USER GUIDE INTRODUCTION This evaluation board is designed to provide a fast and easy start for evaluation of the GSS CozIR®Blink-N sensor. The CozIR®-Blink-N sensor is designed to be power cycled and pre-programmed to take one reading per power cycle. This means that power to the sensor must be removed and reapplied before the sensor will take another reading. Power cycling can be done using the evaluation board software, or manually. The evaluation board brings several interfaces and interconnections shown in Figure 1. The CozIR®-Blink-N Evaluation Board is designed to allow the user to...

USER GUIDE USB DRIVER To interface to a PC, the evaluation board requires a USB-A to USB-Mini B cable and a USB driver to function correctly. Recent versions of Windows will automatically identify and install the USB driver when you plug in the lead. If the USB driver is not installed, or the evaluation board will not connect to a COM port, please download the USB driver from the FTDI website: https://www.ftdichip.com/Drivers/VCP.htm Choose “VCP Drivers” and select the correct driver for your operating system. SOFTWARE INSTALLATION The GSS evaluation board software is available direct from...

USER GUIDE EVALUATION BOARD CONCEPT Figure 1: Evaluation Board Key Components The evaluation board consists of a USB interface device, which connects to an on-board microcontroller. The on-board microcontroller connects to the sensor using either its UART or I2C interface. The interface mode from the microcontroller to the sensor is user selectable. The microcontroller also interfaces to the environmental monitoring sensors. The evaluation board comes with temperature, humidity, pressure, and current sensors. Gas Sensing Solutions Ltd. Page | 6 For regular updates, sign up at...

USER GUIDE Figure 2: Top Side Evaluation Board Figure 3: Bottom Side Evaluation Board Gas Sensing Solutions Ltd. Page | 7 For regular updates, sign up at https://gassensing.co.uk Revision 1.2, 29 March 2021 Copyright © 2021 Gas Sensing Solutions Ltd.

USER GUIDE 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. SWITCH POSITION Page | 8 For regular updates, sign up at https://gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

USER GUIDE 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. In all cases, the CozIR®-Blink-N must be powered cycled to function correctly. The CozIR®Blink-N is pre-programmed to take a single reading per power cycle. This means that power to the sensor must be removed and re-applied before the sensor will take another reading. Note the sensor must be powered via the USB interface (method 2) if the GSS evaluation...

USER GUIDE 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. To enable this mode of operation, the following settings need to be configured. The evaluation board has pull-up resistors for the I2C serial data input/output lines in each of these modes. They pull-up to either the on-board 3.3V supply, or the external VDD on J5, pin 2 and pin 4. All the sensor...

Page | 11 For regular updates, sign up at https://gassensing.co.uk Copyright © 2021 Gas Sensing Solutions Ltd.

USER GUIDE 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. The signal is digitised by the on-board microcontroller. The application software graphically displays the current draw of the sensor over the initial part of the measurement cycle and displays the average current draw whilst it is powered up. The sensor power consumption measurement application operates when using...

USER GUIDE 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. Gas Sensing Solutions Ltd. Page | 13 For regular updates, sign up at https://gassensing.co.uk Revision 1.2, 29 March 2021 Copyright © 2021 Gas Sensing Solutions Ltd.

USER GUIDE 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, and click the CONNECT button. The drop-down list will only show ports with active devices attached. If you do not know the appropriate port select “device manager” on your PC, select Ports, and unplug the SEB and then plug back in. The Com port will show up...

USER GUIDE SENSOR SELECTION Select the correct sensor type and the full-scale range (CO2 ppm) of the sensor. The power LED1 will illuminate green showing the sensor evaluation board is running. Gas Sensing Solutions Ltd. Page | 15 For regular updates, sign up at https://gassensing.co.uk Revision 1.2, 29 March 2021 Copyright © 2021 Gas Sensing Solutions Ltd.