EZO-CO2. Gaseous CO2. Reads. 0 10,000 ppm. Range. Factory calibrated. Calibration. 1 reading per second. Response time. 1 ppm.

Transcription

1 V 1.0 9/12/18 EZO-CO2 Embedded NDIR CO2 Sensor Reads Range Calibration time Resolution Accuracy Warmup time Cable length Data protocol Default I 2 C address Data format Operating voltage Gaseous CO2 0 10,000 ppm Factory calibrated 1 reading per second 1 ppm +/- 3% +/- 30 ppm 10 seconds 1 meter UART & I 2 C 105 (0x69) ASCII 3.3V 5V Written by Jordan Press Designed by Noah Press This is an evolving document, check back for updates.

2 Table of contents Operating principle Physical properties Sensor properties Pin out Sensor warm-up Calibration theory Custom calibration Available data protocol UART I 2 C Default state UART mode Receiving data from device Sending commands to device LED color definition UART quick command page LED control Find Continuous mode Single reading mode Alarm Custom calibration Export/import calibration Enable/disable internal temp Naming device Device information codes Reading device status Sleep mode/low power Change baud rate Protocol lock Factory reset Change to I2C mode Manual switching to I2C I 2 C mode Sending commands Requesting data codes Processing delay LED color definition I 2 C quick command page LED control Find Taking reading Alarm Custom calibration Export/import calibration Enable/disable internal temp Device information Reading device status Sleep mode/low power Protocol lock I 2 C address change Factory reset Change to UART mode Manual switching to UART Datasheet change log Firmware updates Warranty Copyright Atlas Scientific LLC

3 Attention The EZO-CO2 is 100% operational out of the box. CALIBRATION IS UNNECESSARY This sensor detects GASEOUS CO2 This sensor does not read dissolved CO2. DO NOT SUBMERGE! 3 Copyright Atlas Scientific LLC

4 CO 2 Operating principle The Atlas Scientific EZO-CO2 Embedded CO2 Sensor uses a non-dispersive infra-red (NDIR) gas detection cell to derive CO2 content in a gaseous matrix. The NDIR detection cell is a single wavelength spectrophotometer that has been specifically designed to detect 4.2μm infrared radiation. Inlet Active detector CO 2 CO 2 CO 2 CO 2 CO 2 CO 2 CO 2 CO 2 CO2 CO 2 CO 2 CO 2 CO 2 CO 2 CO 2 CO 2 CO 2 IR light source Outlet Reference detector Gaseous CO2 has a prominent absorption band centered at 4.2μm. CO2 content is derived by quantifying how much light energy has been lost when it travels through a gaseous matrix over a fixed distance. Active and reference detectors Mirrors IR blub source Outside Parabloic reflector Inside Optical path 4 Copyright Atlas Scientific LLC

5 Physical properties The EZO-CO2 sensor only detects gaseous CO2 concentrations. This device cannot read dissolved CO2 concentrations. DO NOT SUBMERGE IN LIQUID. 66.2mm (2.6 ) 19.8mm (0.7 ) 10.9mm (0.4 ) 19.3mm (0.7 ) 15.8mm (0.6 ) 27mm (1 ) 1/2 NPT 20mm (0.7 ) Cable Length 1m (3.2 ) 50.4mm (1.9 ) Weight 133g Sensor properties Mirror Filters Detector PCB Bulb Gas permeable lid Parabolic reflector Parabolic reflector 5 Copyright Atlas Scientific LLC

6 Pin out Data and power cable pinout White Green Black Red Blue RX/SCL TX/SDA GND VCC ALM The interrupt pin will go high when a set CO2 level has been crossed. 800ppm *Alarm set to 800ppm If unused leave ALM floating. Do not connect ALM to VCC or GND. See page 20 to enable CO2 level alarm. Power consumption Absolute max ratings LED MAX SLEEP Parameter MIN TYP MAX 5V ON OFF 45 ma 44 ma 3.4 ma Storage temperature Operational temperature -65 C 75 C -20 C 25 C 50 C 3.3V ON OFF 42 ma 41 ma 3.0 ma VCC 3.3V 3.3V 5.5V Humidity Range 0 to 95% rh non-condensing 6 Copyright Atlas Scientific LLC

7 Sensor warm-up When the Atlas Scientific EZO-CO2 Embedded CO2 Sensor is first powered on (or wakes up from sleep mode) the sensor must warm-up before it can output readings. The warm-up process takes 10 seconds to complete. 10 sec During the first 10 seconds of operation the output will be: *warm Once warming is finished, CO2 readings will be output. The device will continue to warm-up over several minutes. As the internal temperature stabilizes, so will the CO2 readings. Thermal equilibrium Temp CO2 *Equilibrium time may vary depending on envirmonent. 0 min 5 min 10 min To see the internal temperature of the sensor and watch as it stabilizes, use the O command found on page Copyright Atlas Scientific LLC

8 Part # EZO-CO2 Part # EZO-CO2 Part # EZO-CO2 Part # EZO-CO2 Part # EZO-CO Embedded NDIR CO2 Meter Part # EZO-CO2 Embedded NDIR CO2 Meter EZO-CO2 Calibration theory The Atlas Scientific EZO-CO2 Embedded CO2 Sensor comes pre-calibrated, and does not need to be recalibrated. Atlas Scientific performs a two-point factory calibration as part of the manufacturing process. CALIBRATION COMPLETE EZO-CO2 Embedded NDIR CO2 Meter Reads Range Calibration time Resolution Accuracy Warmup time Data protocol Data format Operating voltage Gaseous CO2 0 10,000 ppm Factory Calibrated 1 reading per second 1 ppm +/- 5% +/- 50 ppm ~15 seconds UART & I 2 C ASCII 3.3V 5V Reads Range Calibration time Resolution Accuracy Warmup time Data protocol Data format Operating voltage Gaseous CO2 0 10,000 ppm Factory Calibrated 1 reading per second 1 ppm +/- 5% +/- 50 ppm ~15 seconds UART & I 2 C ASCII 3.3V 5V Embedded NDIR CO2 Meter EZO-CO2 Embedded NDIR CO2 Meter EZO-CO2 Embedded NDIR CO2 Meter EZO-CO2 Embedded NDIR CO2 Meter EZO-CO2 Embedded NDIR CO2 Meter EZO-CO2 Embedded NDIR CO2 Meter EZO-CO2 EZO-CO2 Embedded NDIR CO2 Meter EZO-CO2 Low point calibration = 0 ppm High point calibration = 4,000 ppm The factory calibration data is permanently stored in the sensor and cannot be erased. Custom calibration One or two-point calibration can be done at any time. When custom calibration is used, factory calibration will be ignored. To revert back to the factory calibration simply clear the custom calibration. See page 21 for custom calibration commands. 8 Copyright Atlas Scientific LLC

9 Available data protocols default Unavailable data protocols 9 Copyright Atlas Scientific LLC SPI Analog RS-485 Mod Bus 4 20mA

10 Default state UART mode Baud Readings Speed LED 9,600 continuous 1 second on 1 second Green Standby Cyan Taking reading Transmitting Settings that are retained if power is cut Baud rate Calibration Continuous mode Device name Enable/disable response codes Hardware switch to I 2 C mode LED control Protocol lock Software switch to I 2 C mode Settings that are NOT retained if power is cut Sleep mode 10 Copyright Atlas Scientific LLC

11 UART mode 8 data bits 1 stop bit Baud no parity no flow control 300 1,200 2,400 9,600 default 19,200 38,400 57, ,200 RX TX RX Data in TX RX RX TX TX Data out RX TX Vcc 0V 3.3V 5V VCC 0V CPU Data format Units PPM Encoding ASCII Format string Terminator carriage return Data type imal places Smallest string Largest string unsigned int 0 2 characters 12 characters 11 Copyright Atlas Scientific LLC

12 Receiving data from device 2 parts ASCII data string Command Carriage return Terminator 9,600 baud (default) RX TX RX TX TX CPU TX RX RX Sender Receiver 6500 Advanced ASCII: Hex: D : Copyright Atlas Scientific LLC r 0.1

13 Sending commands to device 2 parts Command (not case sensitive) ASCII data string Carriage return Terminator RX TX RX TX TX CPU TX RX RX Receiver Sender Sleep Advanced ASCII: S l e e p Hex: 53 6C D : Copyright Atlas Scientific LLC r 0.1

14 LED color definition Green UART standby Cyan Taking reading Purple Changing baud rate Red Command not understood White Find 5V LED ON +2.5 ma 3.3V +1 ma 14 Copyright Atlas Scientific LLC

15 UART mode command quick reference All commands are ASCII strings or single ASCII characters. Command Function Default state Alarm enable/disable alarm pg. 20 n/a Baud change baud rate pg. 29 9,600 C enable/disable continuous mode pg. 18 Cal performs custom calibration pg. 21 Export/import export/import calibration pg. 22 enabled n/a n/a Factory enable factory reset pg. 31 n/a Find finds device with blinking white LED pg. 17 n/a i device information pg. 25 I2C change to I 2 C mode pg. 32 L enable/disable LED pg. 16 Name set/show name of device pg. 24 O enable/disable internal temperature pg. 23 Plock enable/disable protocol lock pg. 30 n/a not set enabled not set disabled n/a R returns a single reading pg. 19 n/a Sleep enter sleep mode/low power pg. 28 n/a Status retrieve Status Information pg. 27 n/a *OK enable/disable response codes pg. 26 n/a 15 Copyright Atlas Scientific LLC r 0.1

16 LED control L,1 L,0 LED off L,? LED on default LED state on/off? L,1 *OK L,0 *OK L,??L,1 *OK or?l,0 L,1 L,0 16 Copyright Atlas Scientific LLC r 0.1

17 Find This command will disable continuous mode Send any character or command to terminate find. Find LED rapidly blinks white, used to help find device Find *OK 17 Copyright Atlas Scientific LLC r 0.1

18 Continuous mode C,1 C,n C,0 disable continuous readings C,? enable continuous readings once per second default continuous readings every n seconds (n = 2 to 99 sec) continuous reading mode on/off? C,1 *OK CO2 (1 sec) CO2 (2 sec) CO2 (n sec) C,30 *OK CO2 (30 sec) CO2 (60 sec) CO2 (90 sec) C,0 *OK C,??C,1 or?c,0 or?c,30 *OK 18 Copyright Atlas Scientific LLC r 0.1

19 Single reading mode R takes single reading R 6500 *OK Green Standby Cyan Taking reading Transmitting 1 second 19 Copyright Atlas Scientific LLC r 0.1

20 Alarm The alarm pin will = 1 when CO2 levels are > alarm set point. Alarm tolerance sets how far below the set point CO2 levels need to drop before the pin will = 0 again. Alarm,en,[1,0] Alarm,n Alarm,tol,n Alarm,? enable / disable alarm sets alarm sets alarm tolerance (0-500 ppm) alarm set? Alarm,en,1 *OK Enable alarm Alarm,1200 *OK Alarm,tol,100 *OK CO2 level must fall 100 ppm below set point for alarm to reset. Alarm,??,alarm,1200,100 if all are enabled Alarm (1200) Tolerence (100) 1100 CO2 Alarm (Alarm set point - tolerance) ( ) Alarm on Alarm off 20 Copyright Atlas Scientific LLC r 0.1

21 Custom calibration High point calibration can be from 3,000 ppm to 5,000 ppm. Calibration outside of that range my lead to accuracy issues. Cal,n Cal,0 Cal,clear Cal,? calibrates the high point calibrates the zero point restores calibration to factory settings device calibrated? Cal,3900 *OK Cal,0 *OK Cal,clear *OK Cal,??Cal,0 or?cal,1 or?cal,2 or no calibration?cal,3 zero and high point calibration only zero point calibration *OK only high point calibration This device comes pre-calibrated. Custom calibration should not be performed without scientific grade calibration gasses. 21 Copyright Atlas Scientific LLC r 0.1

22 Export/import calibration Export: Use this command to save calibration settings Import: Use this command to load calibration settings Export Import Export,? export calibration string from calibrated device import calibration string to new device calibration string info Export,? 10,120 breakdown 10, 120 # of strings to export # of bytes to export Export strings can be up to 12 characters long, and is always followed by Export Export (8 more) Export Export 59 6F (1 of 10) F 6F 6C *DONE (2 of 10) (10 of 10) Disabling *OK simplifies this process Import, n (FIFO) Import, 59 6F (1 of 10) 22 Copyright Atlas Scientific LLC r 0.1

23 Enable/disable internal temperature from output string O,t,[1,0] enable or disable internal temperature O,t,1 *OK enable temperature O,t,0 *OK disable temperature O,??O,ppm,t if internal temp is enabled Enabling the internal temperature should only be used to confirm that the device is at thermal equilibrium. Refer to page 6 23 Copyright Atlas Scientific LLC r 0.1

24 Naming device Name,n Name,? set name show name n = Up to 16 ASCII characters Name,zzt *OK Name,??Name,zzt *OK Name,zzt Name,? *OK Name,zzt *OK 24 Copyright Atlas Scientific LLC

25 Device information i device information i?i,co2,1.0 *OK breakdown?i, CO2, 1.0 Device Firmware 25 Copyright Atlas Scientific LLC

26 codes *OK,1 *OK,0 *OK,? enable response disable response response on/off? default R 6,500 *OK *OK,0 no response, *OK disabled R 6,500 *OK disabled *OK,??*OK,1 or?*ok,0 Other response codes *ER *OV *UV *RS *RE *SL *WA unknown command over volt (VCC>=5.5V) under volt (VCC<=3.1V) reset boot up complete, ready entering sleep mode wake up These response codes cannot be disabled 26 Copyright Atlas Scientific LLC r 0.1

27 Reading device status Status voltage at Vcc pin and reason for last restart Status?Status,P,5.038 *OK breakdown?status, P, Reason for restart Voltage at Vcc Restart codes P S B W U powered off software reset brown out watchdog unknown 27 Copyright Atlas Scientific LLC

28 Sleep mode/low power Send any character or command to awaken device. Sleep enter sleep mode/low power Sleep *SL Any command *WA wakes up device 5V MAX SLEEP 45 ma 3.4 ma 3.3V 42 ma 3.0 ma Sleep 28 Copyright Atlas Scientific LLC

29 Change baud rate Baud,n change baud rate Baud,38400 *OK Baud,??Baud,38400 *OK n = default Baud,38400 (reboot) Standby Green Changing Purple baud rate *OK Green Standby 29 Copyright Atlas Scientific LLC

30 Protocol lock Locks device to UART mode. Plock,1 Plock,0 Plock,? enable Plock disable Plock Plock on/off? default Plock,1 *OK Plock,0 *OK Plock,??Plock,1 or?plock,0 Plock,1 I2C,100 TX ALM Green *OK Red cannot change to I 2 C *ER cannot change to I 2 C 30 Copyright Atlas Scientific LLC r 0.1

31 Factory reset Clears custom calibration "*OK" enabled Factory enable factory reset Factory *OK Factory (reboot) Green *OK Green *RS *RE Baud rate will not change 31 Copyright Atlas Scientific LLC

32 Change to I 2 C mode Default I 2 C address 105 (0x69) I2C,n sets I 2 C address and reboots into I 2 C mode n = any number I2C,100 *OK (reboot in I 2 C mode) Wrong example I2C,139 n > 127 *ER I2C,100 Green Green *OK (reboot) Cyan Blue now in I 2 C mode 32 Copyright Atlas Scientific LLC r 0.2

33 Manual switching to I 2 C Make sure Plock is set to 0 Disconnect ground (power off) Disconnect TX and RX Connect TX to ALM Confirm RX is disconnected Connect ground (power on) Wait for LED to change from Green to Blue Disconnect ground (power off) Reconnect all data and power Manually switching to I 2 C will set the I 2 C address to 105 (0x69) Short Wrong Disconnect RX line Short RX TX ALM 33 Copyright Atlas Scientific LLC r 0.1

34 I 2 C mode The I 2 C protocol is considerably more complex than the UART (RS 232) protocol. Atlas Scientific assumes the embedded systems engineer understands this protocol. To set your EZO TM device into I 2 C mode click here Settings that are retained if power is cut Calibration Change I 2 C address Hardware switch to UART mode LED control Protocol lock Software switch to UART mode Settings that are NOT retained if power is cut Sleep mode r 0.1

35 I 2 C mode I 2 C address (0x01 0x7F) 105 (0x69) default Vcc 3.3V 5.5V Clock speed SDA khz SCL SDA SCL SCL SCL SDA SDA VCC SCL SDA 0V 0V CPU Data format Reading Units Encoding Format CO2 PPM ASCII string Data type unsigned int imal places 0 Smallest string 2 characters Largest string 12 characters 35 Copyright Atlas Scientific LLC

36 Sending commands to device 5 parts Start I 2 C address Write Command (not case sensitive) Stop 105 (0x69) ASCII command string Start 105 (0x69) Write Sleep Stop I 2 C address Command SDA SDA SCL SDA SDA SCL CPU SCL SCL Advanced Address bits The entire command as ASCII with all arguments SDA SCL A6 A5 A4 A3 A2 A1 A0 W ACK First letter of command ACK Last letter of command ACK Start W = low Stop 36 Copyright Atlas Scientific LLC r 0.1

37 Requesting data from device 7 parts Start I 2 C address Read code Data string Null Stop 105 (0x69) 1 byte "413" Terminator ( 0) 413 SDA SDA SCL SDA SDA SCL CPU SCL SCL Advanced Address bits N bytes of data All bytes after data are Null R = High SDA SCL A6 A0 R ACK code ACK Data ACK Data N ACK Null ACK Null Start NACK Stop ASCII = Copyright Atlas Scientific LLC r 0.1

38 codes & processing delay After a command has been issued, a 1 byte response code can be read in order to confirm that the command was processed successfully. Reading back the response code is completely optional, and is not required for normal operation. Send command CPU Processing delay Receiving data I2C_start; I2C_address; I2C_write(EZO_command); I2C_stop; delay(300); I2C_start; I2C_address; Char[ ] = I2C_read; I2C_stop; Processing delay If there is no processing delay or the processing delay is too short, the response code will always be 254. codes Single byte, not string no data to send still processing, not ready syntax error successful request 38 Copyright Atlas Scientific LLC r 0.2

39 LED color definition Blue I 2 C standby Green Taking reading Purple Changing I 2 C ID# Red Command not understood White Find 5V LED ON +2.5 ma 3.3V +1 ma 39 Copyright Atlas Scientific LLC

40 I 2 C mode command quick reference All commands are ASCII strings or single ASCII characters. Command Alarm Baud Cal Function enable/disable alarm switch back to UART mode performs custom calibration pg. 44 pg. 54 pg. 45 Export/import export/import calibration pg. 46 Factory Find i I2C L enable factory reset finds device with blinking white LED device information change I 2 C address enable/disable LED pg. 53 pg. 42 pg. 48 pg. 52 pg. 41 O enable/disable internal temp pg. 47 Plock R Sleep Status enable/disable protocol lock returns a single reading enter sleep mode/low power retrieve status information pg. 51 pg. 43 pg. 50 pg Copyright Atlas Scientific LLC

41 LED control L,1 LED on default L,0 LED off L,? LED state on/off? 300ms processing delay L,1 Wait 300ms 1 0 Null L,0 Wait 300ms 1 0 Null L,? Wait 300ms 1?L,1 0 ASCII Null or Wait 300ms 1?L,0 0 ASCII Null L,1 L,0 41 Copyright Atlas Scientific LLC r 0.1

42 Find 300ms processing delay Find LED rapidly blinks white, used to help find device Find Wait 300ms 1 0 Null 42 Copyright Atlas Scientific LLC

43 Taking reading 900ms processing delay R return 1 reading R Wait 900ms ASCII 0 Null Green Taking reading Wait 900ms Transmitting Cyan Standby 43 Copyright Atlas Scientific LLC

44 Alarm 300ms processing delay The alarm pin will = 1 when CO2 levels are > alarm set point. Alarm tolerance sets how far below the set point CO2 levels need to drop before the pin will = 0 again. Alarm,en,[1,0] Alarm,n Alarm,tol,n Alarm,? enable / disable alarm sets alarm sets alarm tolerance (0-500 ppm) alarm set? Alarm,en,1 Wait 300ms 1 0 Null Enable alarm Alarm,1200 Wait 300ms 1 0 Null Alarm,tol,100 Wait 300ms 1 0 Null CO2 level must fall 100 ppm below set point for alarm to reset. Alarm,? Wait 300ms 1?,alarm,1200,100 ASCII 0 Null if all are enabled Alarm (1200) 1100 Tolerence (100) CO2 Alarm (Alarm set point - tolerance) ( ) Alarm on Alarm off 44 Copyright Atlas Scientific LLC

45 Custom calibration 900ms processing delay High point calibration can be from 3,000 ppm to 5,000 ppm. Calibration outside of that range my lead to accuracy issues. Cal,n Cal,0 Cal,clear Cal,? calibrates the high point calibrates the zero point restores calibration to factory settings device calibrated? Cal,3900 Wait 900ms 1 0 Null Cal,0 Wait 900ms 1 0 Null Cal,clear Wait 300ms 1 0 Null Cal,? Wait 300ms 1?Cal,0 ASCII no calibration 0 Null or 1?Cal,1 ASCII 0 Null only zero point calibration or 1?Cal,2 ASCII 0 Null only high point calibration or 1?Cal,3 ASCII 0 Null zero and high point calibration This device comes pre-calibrated. Custom calibration should not be performed without scientific grade calibration gasses. 45 Copyright Atlas Scientific LLC

46 Export/import calibration Export: Use this command to save calibration settings Import: Use this command to load calibration settings Export Import Export,? export calibration string from calibrated device import calibration string to new device calibration string info 300ms processing delay Export,? Wait 300ms 1 10,120 ASCII 0 Null breakdown 10, 120 # of strings to export # of bytes to export Export strings can be up to 12 characters long Export Wait 300ms F ASCII 0 Null (1 of 10) (8 more) Export Wait 300ms F ASCII 0 Null (10 of 10) Export Wait 300ms 1 *DONE ASCII 0 Null Import, n (FIFO) Import, 59 6F ASCII (1 of 10) 46 Copyright Atlas Scientific LLC r 0.1

47 Enable/disable internal temperature from output string 300ms processing delay O,t,[1,0] enable or disable internal temperature O,t,1 Wait 300ms 1 0 Null enable temperature O,t,0 Wait 300ms 1 0 Null disable temperature O,? Wait 300ms 1?O,ppm,t ASCII 0 Null if internal temp is enabled Enabling the internal temperature should only be used to confirm that the device is at thermal equilibrium. Refer to page 6 47 Copyright Atlas Scientific LLC r 0.1

48 Device information 300ms processing delay i device information i Wait 300ms 1?i,CO2,1.00 ASCII 0 Null breakdown?i, CO2, Device 1.00 Firmware 48 Copyright Atlas Scientific LLC r 0.1

49 Reading device status 300ms processing delay Status voltage at Vcc pin and reason for last restart Status Wait 300ms 1?Status,P,5.038 ASCII 0 Null breakdown?status, P, Reason for restart Voltage at Vcc Restart codes P S B W U powered off software reset brown out watchdog unknown 49 Copyright Atlas Scientific LLC

50 Sleep mode/low power Sleep enter sleep mode/low power Send any character or command to awaken device. Sleep no response Do not read status byte after issuing sleep command. Any command wakes up device 5V STANDBY SLEEP 45 ma 3.4 ma 3.3V 42 ma 3.0 ma Sleep Standby Sleep 50 Copyright Atlas Scientific LLC r 0.1

51 Protocol lock 300ms processing delay Plock,1 enable Plock Locks device to I 2 C mode. Plock,0 disable Plock default Plock,? Plock on/off? Plock,1 Wait 300ms 1 0 Null Plock,0 Wait 300ms 1 0 Null Plock,? Wait 300ms 1?Plock,1 ASCII 0 Null Plock,1 Baud, 9600 TX ALM cannot change to UART cannot change to UART 51 Copyright Atlas Scientific LLC r 0.1

52 I 2 C address change 300ms processing delay I2C,n sets I 2 C address and reboots into I 2 C mode I2C,101 device reboot Warning! Changing the I 2 C address will prevent communication between the circuit and the CPU until the CPU is updated with the new I 2 C address. n = any number Default I 2 C address is 105 (0x69). I2C,101 (reboot) 52 Copyright Atlas Scientific LLC r 0.2

53 Factory reset Factory reset will not take the device out of I 2 C mode. Factory enable factory reset I 2 C address will not change Factory device reboot Clears custom calibration LED on codes enabled Factory (reboot) 53 Copyright Atlas Scientific LLC r 0.1

54 Change to UART mode Baud,n switch from I 2 C to UART Baud,9600 reboot in UART mode n = Baud,9600 (reboot) Blue Purple Green Changing to UART mode 54 Copyright Atlas Scientific LLC r 0.1

55 Manual switching to UART Make sure Plock is set to 0 Disconnect ground (power off) Disconnect TX and RX Connect TX to ALM Confirm RX is disconnected Connect ground (power on) Wait for LED to change from Blue to Green Disconnect ground (power off) Reconnect all data and power Short Wrong Disconnect RX line Short RX RX ALM 55 Copyright Atlas Scientific LLC r 0.1

56 Datasheet change log Datasheet V 1.0 New datasheet Firmware updates V1.0 Initial release (Sept 12, 2018) 56 Copyright Atlas Scientific LLC

57 Warranty Atlas Scientific Warranties the EZO-CO2 Embedded NDIR CO2 Sensor to be free of defect during the debugging phase of device implementation, or 30 days after receiving the EZO-CO2 Embedded NDIR CO2 Sensor (which ever comes first). The debugging phase The debugging phase as defined by Atlas Scientific is the time period when the EZO-CO2 Embedded NDIR CO2 Sensor is connected into a bread board, or shield. If the EZO-CO2 Embedded NDIR CO2 Sensor is being debugged in a bread board, the bread board must be devoid of other components. If the EZO-CO2 Embedded NDIR CO2 Sensor is being connected to a microcontroller, the microcontroller must be running code that has been designed to drive the EZO-CO2 Embedded NDIR CO2 Sensor exclusively and output the EZO-CO2 Embedded NDIR CO2 Sensor data as a serial string. It is important for the embedded systems engineer to keep in mind that the following activities will void the EZO-CO2 Embedded NDIR CO2 Sensor warranty: Soldering any part to the EZO-CO2 Embedded NDIR CO2 Sensor. Running any code, that does not exclusively drive the EZO-CO2 Embedded NDIR CO2 Sensor and output its data in a serial string. Embedding the EZO-CO2 Embedded NDIR CO2 Sensor into a custom made device. Removing any potting compound. 57 Copyright Atlas Scientific LLC

58 Reasoning behind this warranty Because Atlas Scientific does not sell consumer electronics; once the device has been embedded into a custom made system, Atlas Scientific cannot possibly warranty the EZO-CO2 Embedded NDIR CO2 Sensor, against the thousands of possible variables that may cause the EZO-CO2 Embedded NDIR CO2 Sensor to no longer function properly. Please keep this in mind: 1. All Atlas Scientific devices have been designed to be embedded into a custom made system by you, the embedded systems engineer. 2. All Atlas Scientific devices have been designed to run indefinitely without failure in the field. 3. All Atlas Scientific devices can be soldered into place, however you do so at your own risk. Atlas Scientific is simply stating that once the device is being used in your application, Atlas Scientific can no longer take responsibility for the EZO-CO2 Embedded NDIR CO2 Sensor continued operation. This is because that would be equivalent to Atlas Scientific taking responsibility over the correct operation of your entire device. 58 Copyright Atlas Scientific LLC