Va_Tech_EE

I have no idea what you're talking about. What do you mean it doesn't work on an UNO? If you're trying to do headtracking on a single Arduino, use the HeadTracking_Gyro_TEST.ino code.

That's very simple. Just use the softSerial library instead of Serial2 to transmit data (this will dictate which two data pins you hook up the XBee to the Nano with). Everything else a can stay the same. You will have to look up which pins are SDA and SCL on the Nano, though (this dictates how you hook the gyroscope to the Nano).

Ahh, I see. Arduino handles floats like any other C++ microcontroller. When you divide by 10, just write it as 10.0 and make sure the variable the value is being stored in is type "float"

Sorry to say, but I believe there is a bug in your code!If you look in the sensor datasheet, you do not construct an int out of the low and high bytes of PM10 and PM2.5 like in the code you posted. The datasheet says to do this instead:PM2.5 value: PM2.5 (μg /m3) = ((PM2.5 High byte *256) + PM2.5 low byte)/10PM10 value: PM10 (μg /m3) = ((PM10 High byte *256) + PM10 low byte)/10datasheet link: http://inovafitness.com/software/SDS011%20laser%20PM2.5%20sensor%20specification-V1.3.pdf

Sorry to say, but I believe there is a bug in your code!If you look in the sensor datasheet, you do not construct an int out of the low and high bytes of PM10 and PM2.5 like in the code you posted. The datasheet says to do this instead:PM2.5 value: PM2.5 (μg /m3) = ((PM2.5 High byte *256) + PM2.5 low byte)/10PM10 value: PM10 (μg /m3) = ((PM10 High byte *256) + PM10 low byte)/10datasheet link: http://inovafitness.com/software/SDS011%20laser%20PM2.5%20sensor%20specification-V1.3.pdf PM10 value: PM10 (μg /m3) = ((PM10 high byte*256) + PM10 low byte)/10