Here is a new video of the HummBot. As you can see in the video, I unmounted the IR sensors from the servos and moved them to the front and back bumpers of the HummBot. This way they can be used as short distance (25 cm) object detectors.
I have ordered ultrasonic sensors (at Sparkfun.com) for longer range object detection. These will be mounted on the servos to scan a wide area (1-2 meters) in front of the HummBot.
Another thing that needs attention is speed control. First I want to buy/build an encoder to measure the travelled distance. This is highly needed since the ESC is very inaccurate, resulting in unpredictable distances.I am still thinking about the correct mounting place for an encoder. Suggestions are welcome!
Next to that I am considering to replace the motor with a high torque motor which will make it easier to drive at slow speeds. Currently this is very difficult since there is a subtle balance between driving slow and stalling the motor.