New Ultrasonic Sensor Board


Senior Member
Just got some test boards for our old friend the HC SR04 ultrasonic rangefinder sensors. The $1 sensors are now just 65 cents, and interface easily to a Picaxe using the ULTRA command after doing the clever and well-documented one-pin mod here in the forum.

This standalone test board plus sensor costs just $2.41 at No mods required, it bypasses the Picaxe and provides a direct LED readout in CM of the distance measured, plus it sends a continuous 9600 baud serial data stream of distance measured.

Tech info at