Update README.md

README.md

@@ -3,6 +3,20 @@
 A barebones wrapper to enable control of a Roomba via ESPHome.
 Tested with ESPHome 1.12.1, and a Roomba 650 w/a Wemos D1 Mini installed.
 
-## Setup/Use
+I apologize for how barebones this repo is; as soon as I got the Roomba/ESPHome component working, I was distracted by other projects. I hope to come back to this someday.
 
-Take a look at the example directory for a fully working example (very close to my setup).
+## Hardware
+
+The inspiration for this project is https://github.com/johnboiles/esp-roomba-mqtt. You'll find a detailed wiring guide there. In fact, I originally started off using that project for my Roomba 650. However, as I migrated my custom components to ESPHome, I wanted my Roomba to be on the same platform as the other devices. 
+
+I should note that like others, I initially had trouble reading the sensor data from the Roomba. I posted the solution I found in https://github.com/johnboiles/esp-roomba-mqtt/issues/2#issuecomment-373956173
+
+> For what it's worth, my Wemos D1 Mini couldn't read the Roomba sensors either. I found this snippet in an iRobot Create 2 Doc
+>
+>> In some cases, the drive strength of a Roomba TX line is not enough to drive the RX line of another board (for example, in some revisions of Arduino). In this case, a simple PNP transistor (2N2907A, 2N3906, or 2N4403, among others) can be used to provide enough “drive” for the Arduino.
+> 
+> I used a 2N3906 and following the circuit as described in the PDF; I can now read sensor values from the Roomba!
+
+## Software Setup/Use
+
+Take a look at the example directory for a fully working example (very close to my setup).