bmp180 pressure only sea level ?

[alienos]

How to set the altitude and the real pressure?
I use nodemcu latest.bin error not enough memory
nodemcu_20150123.bin working fine.
Sorry for my english

[javieryanez]

Hi,

the read pressure is the absolute pressure. In the datasheet of the bmp180 (https://www.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf) is indicated how calculate the relative pressure (sea level) and the altitude. But this needs floating point, and the floating point support in NodeMcu has only a few days. You can try calculate it using the information of the datasheet.

I don't test the module with the last version. Is very possible that with the introduction of the floating point the module fails. I have not tested yet. I have already corrected the module to DHT22. I have to find time to review the BMP180 module.

Sorry for my english ;)

[jtheires]

Javier,
Thanks for posting this Lua code for the BMP180.
I'm new to Lua script - are there any parts of the bmp180.lua source code which need to be modified for my particular implementation? Do you have a tutorial or other "how-to" information that may help me get started?
I wish to connect my 8266 esp-01 module to my bmp180 (no Arduino) and send temp/press values to thingspeak.
Thanks!