Look at the section on I2C
If SDO is tied to ground the slave address is 0x76
If SDO is tied to Vcc the slave address is 0x77
I don't have either a Puck or the BMP chip, so I hope this helps. If not maybe someone else can help.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
The Datasheet can be found at:
https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMP280-DS001-18.pdf
Look at the section on I2C
If SDO is tied to ground the slave address is 0x76
If SDO is tied to Vcc the slave address is 0x77
I don't have either a Puck or the BMP chip, so I hope this helps. If not maybe someone else can help.