This small sonar ranger from Devantech offers an amazing wide range from 3cm to 6m. The SRF10 is interfaced using the IIC bus.
If you are interested in Internet of Things (IoT) or M2M projects check our open source sensor platform Waspmote which counts with more than 100 sensors available to use 'off the shelf', a complete API with hundreds of ready to use codes and a low consumption mode of just 0.7µA to ensure years of battery life.
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