The HC-SR04 is a commonly available low cost ultrasonic range sensor. It is dumber than some, which is why it is cheaper. Your Arduino has to handle the timing and calculations. I've created the Octosonar and SonarI2C library to handle up to eight of these using the I2C bus and one hardware interrupt pin.
I'm selling these in pairs with 8" cables.
I've created the Octosonar and SonarI2C library to handle up to eight of these using the I2C bus and one hardware interrupt pin. I'm stocking the HC-SR04 as well so you can get the whole bundle in one go - and be sure that they will work with the Octosonar.
Luckily before anyone bought any of these I discovered that the ones I had originally stocked were the flavor that lock up the Echo pin high if they do not get a return signal. See this thread on the Arduino forum. As the Octosonar multiplexes the Echo signal through a logic gate, these faulty HC-SR04 clones will lock up the entire board. The units stocked now are a different board layout matching the ones I had when prototyping the Octosonar - and I test them individually to be sure.
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