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"My electronics is mostly self-taught too, so I have (many) holes. I use the "Art of Electronics" a lot, which is brilliant.
The only way to amplify the return signal I feel I understand is to use an Op Amp and a few resistors to set gain.
How you…"
The only way to amplify the return signal I feel I understand is to use an Op Amp and a few resistors to set gain.
How you…"
"I agree, at 5V driving the transducer is likely just as good from the Arduino directly. There impedance is about 1K at 40KHz. I wasn't thinking of current, but the voltage.
These are the sensors I have:…"
These are the sensors I have:…"
"I have a sillyscope, and I've been meaning to do that for months!
I need to get my work done 1st and avoid distractions like this :-(
I tend to use an Arduino for signals. It is extremly easy to make a 38KHz signal using the hardware timers, and I…"
I need to get my work done 1st and avoid distractions like this :-(
I tend to use an Arduino for signals. It is extremly easy to make a 38KHz signal using the hardware timers, and I…"
"David, that's an interesting suggestion. I am a bit busy for the next few weeks to try it, but I think the ability to calculate position would be extremely useful even for Earth-bound robots. I have several sets of very low-cost ultrasonic…"
"Testing in real conditions beats theories to a pulp. Oh, if only politicians realised this :-)
I've had a further thought. I am no expert so I apologise for consuming your valuable time if this has already been considered and thrown out.
In…"
I've had a further thought. I am no expert so I apologise for consuming your valuable time if this has already been considered and thrown out.
In…"
"I assume you're concerned about telling the difference between direct sound and a reflection of a wall?
It is probably a combination of techniques, including, at least:
1. If only one device at a time shouts, and they leave a big gap every receiver…"
It is probably a combination of techniques, including, at least:
1. If only one device at a time shouts, and they leave a big gap every receiver…"
"Ooops - forgot to add ...
An approach to common bus arbitration is solved by CAN bus, and is described here:
http://en.wikipedia.org/wiki/Controller_Area_Network
look a the Technology heading.
I have *not* used with this protocol, but I have…"
An approach to common bus arbitration is solved by CAN bus, and is described here:
http://en.wikipedia.org/wiki/Controller_Area_Network
look a the Technology heading.
I have *not* used with this protocol, but I have…"
"There was a neat technique explained in a recent Scientific American on Robotics (May 2008, "An Army of Small Robots", by R Grabowski, L E Navarro-Serment and P K Khosla, This looks like a plausible reference:…"
