I have a functioning weather station (temp/humid, MQ-2 smoke sensor, anemometer), and want to add a barometer. The weather station is outside, linked to my inside display and RTC by the I2c&Power modules and ethernet cable. The cable supplies 12v and I use a small converter to provide the 5v to run the I2c&Power board and the rest.
So I have 12v and 5v available out at the weather box.
Inside along with the RTC and LCD display I have a 2-port I2C&Power which will be used in the future (with the new pgpio library) to feed the info to an Rpi3 to create a web page to show changes over time.
The barometer module I bought is the BMP-180. It is nice and tiny and looks perfect for the job, but the instructions all over the web tell me that it will burn up if powered by 5V. The Arduino Nano does not have a 3.3v output pin like the Uno does.
Q: What is the easiest way to accomplish adding this 3.3v board to the weather station?