Best way to add multiple sensors?

[PaddyB]

i so I would go for multiple sensors and connect them via I2C. The I2C bus uses only two pins + VC and GND and it's very easy to use. 

With openplotter it's actually probably better to go for the ds18n20 thermometers, they connect via 1wire. Openplotter has a tab for this, easy to set up. 

I have them connected to cylinder head, exhaust and alternator then convert the cylinder head to nmea water temperature so it's visible in the opencpn dashboard. 

Also, a breakout board makes things a bit easier when connection to the gpio pins..

  

https://learn.adafruit.com/adafruits-ras...ng/ds18b20