* Posts by Win_termute

3 posts • joined 22 Dec 2011

LOHAN ideas..

Win_termute

If the pull of the tethering line disappears - fire

Can't you just measure the weight of the truss + the plane maybe once every tenth of a second. If that weight is less than say 10% of the actual weight it would mean that the balloon has burst and the assembly is falling. If the weight stays below 10% for three (or more) consecutive measurements it's probably not just a wind gust but an actual balloon burst. Use the altimeter to only enable this system above most of the weather to ignore a bumpy start.

If that is not enough use the above to prime the system and then wait for the jerk in the tether line when the parachute deploys using the same weight measurement system and then fire.

Use a longer tether line from the parachute than the height of the balloon to prevent it from covering the plane...

Latest El Reg project: Rise of the Robot Sheep

Win_termute
Linux

Some ideas

How about buying one of those weed cutters that has a plastic wire spinning at high speed? It should cut grass just fine but probably just convince the owner of any fingers put in it's path that they (the fingers that is) would be better off somewhere else. If you bought a wireless one you would get both a battery and a charger for the lawnmower as well.

As for guidance, how about having the mower emit an infrared pulse every few seconds. You would then have tree strategically placed recievers that would look for their own pulse (one, two or three short pulses, possibly after an initialization pulse to make sure they are looking). The recievers would then emit an ultrasound pulse that the mower would hear. It would then calculate the distance to each reciever. Poor man's gps. It should then be a simple matter to program the path the mower should use.

I agree with previous posts that the arduino would be a perfect fit for this project

Win_termute
Linux

Some thoughts

How about buying one of those weed cutters that has a plastic wire spinning at high speed? It should cut grass just fine but probably just convince the owner of any fingers put in it's path that they (the fingers that is) would be better off somewhere else. If you bought a wireless one you would get both a battery and a charger for the lawnmower as well.

As for guidance, how about having the mower emit an infrared pulse every few seconds. You would then have tree strategically placed recievers that would look for their own pulse (one, two or three short pulses, possibly after an initialization pulse to make sure they are looking). The recievers would then emit an ultrasound pulse that the mower would hear. It would then calculate the distance to each reciever. Poor man's gps. It should then be a simple matter to program the path the mower should use.

I agree with previous posts that the arduino would be a perfect fit for this project

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