Got a BMP 180 in the mail today. It’s 3.3 volts only (simpler card than my previous Adafruit breakout), so I power it from the Teensy 3.3V output (the main power is 5V, because everything was compatible with it until now, and the modem is only 5V). By using my old Arduino code, I realize it’s built under the assumption that int are 16 bits wide, not true on the Teensy (which is using a Cortex M4 32 bits K20 processor), so I have to correct that. Ok for the temperature, still some work to do on the pressure.