I've added a cute hammer, a body, and a panel that registers when hit. I have the code setup so that it will register a hit even if it is in the middle of a command. 2 way communication is working so that the Arduino pro mini talks to the ESP8266 which can talk to twitch chat. I had an issue that the robot would sometimes fall backwards and get stuck on it's back when it hit something tall. I fixed this by setting the hammer to return in a position that rights it self the right way up. Works great. Now if it falls on it's back it gets back up.