Facelesstech made a light following bristle bot and wrote a post on his blog detailing its assembly:
Lets have a look at the hardware side of the build. Here is a bread board layout below. As you can see its just 2 bristle bots where the pager motor is controlled by a 2N7000 transistor which its speed is determined by the LDR (Light Dependent Resistors) and adjusted with a resistor trim pot. I also added a led to each one to show which pager motor is being activated, This makes it easier to see whats going on too.
More info at Facelesstech’s blog. Project files available on github.
Check out the video below: