CozIR
®
-LP3 Evaluation Board User Guide
Revision 1.5: 15 December 2020
Page | 12 For regular updates, go to https://gassensing.co.uk
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 displays the current draw of the sensor over a measurement cycle. The
sensor power consumption measurement application operates when using sensor power method 2.
It cannot be used when powering the sensor using method 1 or 3.
ENVIRONMENTAL CONDITION MONITORING
In addition to CO
2
measurement, the sensor evaluation board comes with the ability to measure
relative humidity, temperature and pressure in real time. These functions operate independently of
the CO
2
sensor. The application software displays and can store these conditions. The evaluation
board must be powered either via the USB interface (method 2), or the external power supply
(method 1).
EVALUATION BOARD BUTTONS, JUMPERS AND LED INDICATORS
BUTTON DESCRIPTION
S1
USB power or external power
S2
Blink mode. Cuts power to the sensor with CozIR®-Blink. Unused for CozIR®-LP3.
S3
Unused
S4
Unused
S5
Evaluation board micro to sensor interface
S6
Reset MCU
JUMPER DESCRIPTION
PL1
No fit for CozIR®-LP3
PL2
Allows sensor to be isolated from USB or S1 power connections. Remove jumper if
using external power via J5
LED
DESCRIPTION
LED1
Green. Shows Evaluation board is running
LED2
Green. Shows transmission of data to the board in UART mode
Red. Shows transmission of data to the board in I
2
C mode
LED3
Green. Shows transmission of data from the sensor in UART mode
Red. Shows transmission of data from the sensor in I
2
C mode
