It is a bit of a challenge to get accurate distance readings with sonic sensors. Sonic sensors report stable readings when faced a flat surface and there is no obstacles between sonic sensors and a target. The following image shows distance readings to a wall. Both sensors read 27" distance:
![](https://cdn.hackaday.io/images/8735931586370767011.jpg)
Once I turn sensors away from the wall I get:
![](https://cdn.hackaday.io/images/4209351586371841846.jpg)
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