Update README.md

README.md

@@ -2,10 +2,17 @@
 Publish data from the bme680 sensor over MQTT using micropython. Makes use of:
 * https://github.com/gkluoe/bme680/blob/master/library/bme680/i2c.py
 * https://github.com/pimoroni/bme680
-
 Am using in my leak sensor rig:
 * https://www.hackster.io/robin-cole/micropython-leak-detector-with-adafruit-and-home-assistant-a2fa9e
 
-Note that I init my wifi connection in a boot.py.
+[On Wipy 3](https://docs.pycom.io/datasheets/development/wipy3#pinout), P9 = SDA and P10 = SCL.
+Read sensor bytes using `machine` with:
+```python
+from machine import I2C
+i2c = I2C(0)   # using defauls P9 and P10
+i2c.scan() # returns [119] which is hex 0x77
+i2c.readfrom(0x77, 5) # read 5 bytes
+```
+
 
 <img src="https://github.com/robmarkcole/bme680-mqtt-micropython/blob/master/BME680-wipy.JPG">