Robot electronics small single transducer ultrasonic range finder robot electronics srf01 this single transducer ultrasonic range finder is mounted to a small footprint pcb making it the ideal distance sensor for small robotics applications the srf01 sends data via a single wire serial connection which can be interfaced with picaxe arduino or similar microcontrollers user configurable addresses mean up to 16 modules can be used on the same microcontroller robot electronics srf01 the world