Passive PING mode?

Grievousfish

Does anyone know if it is possible to receive·PING signals without sending a signal out?·

Say for example, hypothetically speaking of course,·someone built a robot with a multi-suction dart launcher and he wanted the robot to launch darts at another robot if it PINGed his robot.· Would it be possible to detect the other robots PING signal?

allanlane5

Without an 'outgoing' pulse, you can't determine distance. You can determine direction -- but that requires more lateral resolution than the 'ping' sensor gives you.

In any event, a 'ping' sensor has an on-board 'pic' chip, which produces the 'pulse' which the BS2 measures using PULSIN. There's nothing in a 'ping' sensor that would let you use it as a 'passive' device. There are some other ultrasonic devices which you might use for this purpose -- but again, the BS2 probably doesn't have enough 'speed' horsepower to measure the differences in arrival times that would let you figure out bearing.

MarkS

Jameco sells ultrasonic transponders pretty cheap. Maybe use two as ears to get the direction?

Franklin

I saw a video on some site that had robots that held formation on a leader. The leader sent out an RF and US (ULTRASONIC) pulse simultaneously. the followers would time between the rf and us pulse for distance and the time lag between receiving the us at three sensors spaced in a triangle on the bot to compute direction.

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- Stephen

Grievousfish

I am not really worried about plotting distanceor bearing or even having any accuracy at this point. I was going more for "shock" than "awe". The launcher will fire 12 darts and I will have the launcher mounted on a platform that rotates on a limited arc.

Dgswaner

you just totally described the robot my son wants me to build him, what were you going to use for the dart launcher? I was going to make one but I thought it would take too much time, so I decided to hack a USB missle launcher, I was going to use IR for detecting the "enemy".

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A complex design is the sign of an inferior designer. - Jamie Hyneman, Myth Buster

k4shf

Intimidation is the name of the game....darts, bullets, rockets, thermonuclear devices....if that don't "wow" them, nothing will....

Grievousfish

Hey Dgswaner - I deconstructed a Mattel Rapid Fire Mobile Assault Vehicle with Remote that I purchased for about $25 at Target. The dart launcher is easily removeable from the truck section and only has a double wire connector that you have to disconnect from the control board. Dart firing is powered by a DC motor housed within the dart launcher. Since the truck part has differential steering, you can also harvest two dc motors from the rear wheels or you could just slice off the cab of the truck and mount a board with a Stamp and connect the motors and dart launcher.

I have an ARobot from Arrick Robotis with double decks that I am mounting the dart launcher on top of. I am getting a turntable from Lynxmotion that launcher will be mounted on and then I will mount the turntable mount to the top deck. The ARobot has an extra DC motor connection so I can just plug the launchers connector in and control firing through the coprocessor. My ARobot is called Turtle_Bot because the top deck is painted like a turtle shell. Once the dart launcher is installed, it will become Teenage Ninja Mutant Turtle_Bot. My sons think its pretty cool!

k4shf - darts are never to be used in anger, only in self defense Being PINGed by unknown robots could be interpreted as an hostile act on some planetary systems.