Hi All, I need to detect distance fairly precisely (detect an object like my hand within 1/4" in the range of 1-24in), and I'm wondering what the best method to pursue would be. Here are the options that I'm aware of:
Ultrasound (via the Parallax Ping sensor, e.g.) IR emitter/detector capacitance sensing (via, e.g. the Capsense library) heterodyning (like a theremin)
I tried capacitance sensing, but even after I set it up with shielded cables and so on it doesn't appear to have the range or the precision or the stability I want.
In an ideal world, the sensor module would be precise, stable, have a light processor footprint, and if possible linear in nature.
Any ideas? I don't mind buying an IC to do the job, I'm just unsure where to go next with this.