Example code for COZIR CO2 sensor works fine with an Arduino Uno, but not with a Pro Mini 5V (using external 3,3V supply for the sensor)
Example code at Application Note 128 - Arduino UART to Interface to COZIR Sensor
This is how the two hook up:
SoftwareSerial mySerial(12, 13); // RX, TX pins on Ardunio
I only see the "Demonstration" line via the Serial Monitor when using the Pro Mini 5V.
Shouldn't this work without any modifications?
I don't have a 3.3V Pro Mini yet...