This module - and the associated library - allow you to connect eight HC-SR04 ultrasonic range sensors to an Arduino using the I2C bus and one hardware interrupt pin.
I wanted more sensors on my robot to help it navigate. I'm too cheap to buy a mega board with enough pins or smarter sensors that need less pins.
The library handles all the timing, and the hardware interrupts provide surprisingly high accuracy. Each unit is individually tested using an Arduino shield based test-bed and ships with separate pin headers.
I am stocking some of the sensors and cables too, so you can get them at the same time. These are listed as a separate item because they won't go in a flat envelope so the shipping is different. Each one is individually tested to verify that it does not have the echo-lock problem.
Please check out the Hackaday documentation and the github library for more info.
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