The present invention relates to a rock drill bit for percussive drilling. The concurrent peer-to-peer communications may take place within an ad hoc network of devices. The imaging and irrigation channels are permanently affixed relative to one another. A controller generates control signals for actuation of the first transistor switch and the second transistor switch. Based on this ability to determine characteristic values for an asphalt blend based on the properties of individual blend components, appropriate blends of asphalts can be selected in order to arrive at an asphalt blend with desired properties. The master unit may discover remote sensor units as they enter or leave the area where the master unit is located.