BME280 example doc updates

Author: Andrew Menagarishvili

Examples/Microsoft.PowerShell.IoT.BME280/README.md

@@ -5,11 +5,16 @@ This PowerShell module is for interacting with [BME280 environmental sensor](htt
 ## Hardware setup
 
 Several vendors have breakout boards with BME280 sensor. In this example we'll use [BME280 breakout board from Adafruit](https://www.adafruit.com/product/2652).
+
 BME280 sensor supports both I2C and SPI interfaces; in this example we'll use I2C.
+
 Later, in the software section, we'll need to use I2C address of the BME280 sensor.
 The default I2C address is 0x77. It can be changed to 0x76 by connecting SDO to GND.
+
 Wiring diagram with Raspberry Pi 3 is like this:
 
+![bme280_schema](https://user-images.githubusercontent.com/11860095/38394384-1899c3d4-38e3-11e8-8f8d-a93918971773.png
+
 ## Software setup
 
 ### Install PowerShell Core on Raspberry Pi
@@ -18,10 +23,10 @@ Installation instructions can be found [here](https://github.com/PowerShell/Powe
 
 ### Enable I2C interface on Raspberry Pi
 
-1. sudo raspi-config
-2. 5 Interfacing options
-3. P5 I2C
-4. Would you like ARM I2C interface to be enabled -> Yes
+1. `sudo raspi-config`
+2. `5 Interfacing options`
+3. `P5 I2C`
+4. `Would you like ARM I2C interface to be enabled -> Yes`
 
 ### Start Powershell and install modules
 
@@ -34,10 +39,14 @@ Import-Module ./PowerShell-IoT/Examples/Microsoft.PowerShell.IoT.BME280
 
 ### Collect Data
 ```powershell
-PS /home/pi> $d = Get-BME280Device -Id 0x77 # I2C address of the sensor
-PS /home/pi> Get-BME280Data -Device $d
+PS /home/pi> $device = Get-BME280Device -Id 0x77 # I2C address of the sensor
+PS /home/pi> $data = Get-BME280Data -Device $device
+PS /home/pi> $data
 
 Temperature Pressure Humidity
 ----------- -------- --------
       26.08  1009.41    29.21
+
+PS /home/pi> "Temperature in Fahrenheit = $($data.Temperature * 1.8 + 32)"
+Temperature in Fahrenheit = 76.69
 ```