PBP projects for R/C models

[ScaleRobotics]

Hey Ken, I am often caught taking things too literally, so this may just be another case of that. But from the data sheet for the sensor you are using, it says:

The SRF05 can be triggered as fast as every 50mS, or 20 times each second. You should wait 50ms before the next trigger, even if the SRF05 detects a close object and the echo pulse is shorter. This is to ensure the ultrasonic "beep" has faded away and will not cause a false echo on the next ranging.

So me taking that literally, since you have two sensors, the best you could get following the data sheet, is every 100 ms. At 20 mph, that's 30 feet per second, or about 3 feet in 100 ms. But maybe 20 mph is a bit fast anyway.

At that rate, you would only be able to steer the servo's every 5 servo pulses, before you got new information from the sensors. But looking on the bright side, you would have time for 500,000 instructions to chew on the data you collected.

[Kenjones1935]

Yes, that is what my SRF05 says too. Presently my code has been pinging at about 5 times per second for each SONAR. I can up that rate.

My thoughts have been that more sophisticated math might give my car better control. I am thinking about mapping - sort of. If the car knows what it is trying to do, where it is relative to the walls and how fast it is going, it may not need so many SONAR pings. I may be just dreaming. I know nothing about classical robot positional and navigational code.

Hmmmmm.... Suggestions anyone? Has the "Robotics for Dummies" paper back been published?

Ken