Arduino MEGA 2560 Application Note

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©16March2017CO2Meter,Inc.AllRightsReserved 1
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ApplicationNoteAN‐157:
ArduinoUARTInterfacetoTelAireT6613CO2Sensor
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Introduction
TheArduinoUNO,MegaandMega2560areidealmicrocontrollersfor
readingCO2sensors.Arduinoboardsareusefulforabeginnerlevel
projectuptointegrationintoacompletesensorproduct.TheArduinoto
sensorinterfaceisvia19,200BAUDserialTXD‐RXDconnection.
IfyouarenewtoArduino,theselowcostdevelopmentboardsare
availablefrommanysources.Werecommendyoustartwithauthentic
Arduinoproducts.
TheAmphenolTelAireT6613CO2Sensorisanon‐dispersiveinfrared
(NDIR)carbondioxidesensorfactorycalibratedtomeasureCO2levels
upto2,000ppm(0.2%).ItisoneofthemostpopularC02sensorsever
produced.Thedualchanneldesigneliminatestheneedforcalibration
inmostapplications.Itsflexibleinterfaceisdesignedtobeeasily
connectedtoanArduinoorsimilarmicrocontroller.Thesensor
requires5VDC,180mApeakcurrentand33mAaveragecurrent.
RuntheArduinoBlinkExample
ThebestwaytobecomefamiliarwiththeArduinoGraphicalUser’sInterface(GIU)istocreatean
ArduinoprojectandruntheexampleBlink.Thissimpletestprogramconfirmsthatanumberof
connectiondetailsandthattheGUIareworkingproperly.
Caution:DonotconnectyourArduinoboardtoyourcomputer’sUSBportuntiltheArduinosoftware
isinstalled.OtherwiseWindowswouldinstallagenericdriver,notdesiredhere.
Step1:InstallArduinosoftwareonyourcomputer.FromthispageselecttheWindowsInstaller.
https://www.arduino.cc/en/Main/Software
Step2:ToruntheBlinkexamplefollowtheseinstructions:https://www.arduino.cc/en/Tutorial/Blink
NotethattheMEGAArduinoshaveaLEDonboard.TheArduinoUNOmayrequireaLEDandresistor
beaddedasspecifiedinthetutorial.
OnceBlinkrunsproperly,youcanconnectthesensor.

Arduino MEGA 2560 Specifications

General

Microcontroller	ATmega2560
Operating Voltage	5V
Input Voltage (recommended)	7-12V
Input Voltage (limit)	6-20V
Digital I/O Pins	54
PWM Channels	15
Analog Input Pins	16
DC Current per I/O Pin	20 mA
DC Current for 3.3V Pin	50 mA
Flash Memory	256 KB of which 8 KB used by bootloader
SRAM	8 KB
EEPROM	4 KB
Clock Speed	16 MHz
LED_BUILTIN	13
Length	101.52 mm
Width	53.3 mm
Weight	37 g