A common requirement is to add ranging to a Pixy so you can detect an object and determine it's distance. This is a bracket to firmly mount the commonest types of ultrasonic sensor below the Pixy lens.The bracket was designed for the US-100 ultrasonic sensor shown in the images. It also fits the SRF05 which has a slightly shorter and thicker PCB. The file for this is US_Bracket-A. The HC-SR04 has components closer to the PCB edge and file US_Bracket-B shortens one of the guides to allow for this. (I haven't printed the 'B' off but it should hold secure enough.) Insert the sensor from the top before sliding the bracket onto the Pixy to butt against the lens body. The sensor connector does partially cover the Pixy LED, but if this is a problem in your application remove the header and wire direct to the sensor PCB.