bme280.xlua

-- BME280 documentation: 
-- A basic example designed to test your BME280 wiring.
-- To run this code: https://realtimelogic.com/ba/ESP32/source/BME280.html

-- Wire up a BME280 via I2C:
-- https://learn.sparkfun.com/tutorials/sparkfun-bme280-breakout-hookup-guide/all
--  1: Upload the bme280.lua module to the .lua directory i.e. to
--     http://esp32-ip/fs/.lua/ (ESP32 web-file-manager and WebDAV address)
--  2: Create an app using Xedge and add this file to the app
--  3: Set your I2C GPIO settings below
--  4: Save and run

-- Check out the MQTT Sparkplug-Enabled Weather Station after testing
-- this example: http://bit.ly/3DwZYZY

local SDA_GPIO <const> = 21 -- the GPIO number; if you connect SDA to GPIO8, then set this to 8
local SCL_GPIO <const> = 22 -- the GPIO number; if you connect SCL to GPIO9, then set this to 9

local BME280_I2C_ADDR <const> = 0x76 -- Default BME280 I2C address

local settings={
   tStandby=1,
   filter=4,
   pressOverSample=5,
   humidOverSample=1,
   tempOverSample=2
}

bme,err = require"bme280".create(0, BME280_I2C_ADDR, SDA_GPIO, SCL_GPIO, settings)
if bme then
   local temperature, humidity, pressure = bme:read()
   print(string.format("Temperature:  %0.2f, Humidity:  %0.2f, Pressure:  %0.2f",
                       temperature,humidity,pressure/100))
   bme:close()
else
   print("Cannot create bme280 instance:", err)
end