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hello all, I am trying to come up with a good final year project for my elec eng degree. A subject that I am really interested in is unmanned aircraft. I would like to know if it would be possible to control the servos of a model RC aircraft using a bx-24, servo controller and attitude sensors(gyros, pressure sensors for altitude and airspeed). On the face of it, it doesn't look too hard. The bx-24 should be able to monitor all sensors and drive servos accordingly to keep the aircraft straight and level or turn towards a waypoint. Navigation could be as basic as a compass, or interfaced with a gps engine. Once the nav system is working, other options may be fitted (ie cameras, atmospheric sensors, payloads etc) PROBLEM - Wherever I look for info on this topic, it seems to need a hell of a lot of R&D and even more money (10's of thousands of dollars or more) I guess I would like any thoughts as to whether it would be possible to achieve aircraft stability and basic nav within 12 months using a bx-24. Any comments, suggestions or alternatives would be very much appreciated. Thanks in advance, Dave (Sorry this has turned out a bit long winded.)

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with 5 ft649 chips and 1 ft639 chip I am controling 25 servos. there is no r/d for servo controle. it is a simple and easy setup. the only problem I have come up with is that those chips com at 4800 pbs. there are faster ones. www.controleeverything.com what you are looking for here is there "SCAM" chip. they run at 9600. --- David Blow <> wrote: > hello all, > > I am trying to come up with a good final year > project for my elec eng > degree. > > A subject that I am really interested in is unmanned > aircraft. > > I would like to know if it would be possible to > control the servos of > a model RC aircraft using a bx-24, servo controller > and attitude > sensors(gyros, pressure sensors for altitude and > airspeed). > > On the face of it, it doesn't look too hard. The > bx-24 should be able > to monitor all sensors and drive servos accordingly > to keep the > aircraft straight and level or turn towards a > waypoint. > > Navigation could be as basic as a compass, or > interfaced with a gps > engine. > > Once the nav system is working, other options may be > fitted (ie > cameras, atmospheric sensors, payloads etc) > > PROBLEM - Wherever I look for info on this topic, it > seems to need a > hell of a lot of R&D and even more money (10's of > thousands of > dollars or more) > > I guess I would like any thoughts as to whether it > would be possible > to achieve aircraft stability and basic nav within > 12 months using a > bx-24. > > Any comments, suggestions or alternatives would be > very much > appreciated. > > Thanks in advance, > > Dave > (Sorry this has turned out a bit long winded.) ------------------------------------------------------------------------ > Missing old school friends? Find them here: > http://click.egroups.com/1/5534/7/_/565855/_/961077348/ > ------------------------------------------------------------------------ __________________________________________________

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I don't see why this couldn't work, although I don't know of anyone doing it with the BX24. You should really ask about this on the basicstamps egroups list, at least a couple people are building these and could give you some pointers. I think there are web pages devoted to at least one of those projects as well. The analog devices accelerometers (ADXL series) can apparently be used as quite accurate tilt sensors. The data sheets actually show you how to do this, check analog.com. Motorola makes a cheap and accurate series of pressure sensors (MPX) that could easily be interfaced to the analog inputs on the BX24. Prof. Anderson sells these on his site, click the 'ordering' link for the products he offers: http://www.phanderson.com/ Servos can certainly be controlled with BasicX, and several people here have interfaced a GPS and/or a Vector compass...I think the other guys can switch the 'autopilot' function on or off by radio control - allows you to assert control over it if anything goes [too] wrong. The tricky bit is obviously the realtime control algorithm, but other people may have the basics done already. The Futaba helicopter gyros may be useful, but know that these are *rate* gyros only, and tell you nothing about absolute position. These require a standard 50hz servo pulse train to drive them, then you can read the modified pulses coming out. Another idea might be to make an autonomous land or sea (or undersea - see Jon Hylands site) vehicle. Essentially a robot. This reduces the (expensive) prospect of crashing, and could still be interfaced to lots of sensor data and perform all kinds of impressive navigational feats...you could even equip it with a packet radio transmitter and track it with APRS! Best, Duncan

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I am doing the same project - you might be in for an easy grade on your course look at my webpage for info http://www.inetport.com/~davisele/fc.html richard ----- Original Message ----- From: David Blow <> To: <> Sent: Thursday, June 15, 2000 8:55 AM Subject: [BasicX] bx-24 & UAV? > hello all, > > I am trying to come up with a good final year project for my elec eng > degree. > > A subject that I am really interested in is unmanned aircraft. > > I would like to know if it would be possible to control the servos of > a model RC aircraft using a bx-24, servo controller and attitude > sensors(gyros, pressure sensors for altitude and airspeed). > > On the face of it, it doesn't look too hard. The bx-24 should be able > to monitor all sensors and drive servos accordingly to keep the > aircraft straight and level or turn towards a waypoint. > > Navigation could be as basic as a compass, or interfaced with a gps > engine. > > Once the nav system is working, other options may be fitted (ie > cameras, atmospheric sensors, payloads etc) > > PROBLEM - Wherever I look for info on this topic, it seems to need a > hell of a lot of R&D and even more money (10's of thousands of > dollars or more) > > I guess I would like any thoughts as to whether it would be possible > to achieve aircraft stability and basic nav within 12 months using a > bx-24. > > Any comments, suggestions or alternatives would be very much > appreciated. > > Thanks in advance, > > Dave > (Sorry this has turned out a bit long winded.) > > > ------------------------------------------------------------------------ > Missing old school friends? Find them here: > http://click.egroups.com/1/5534/7/_/565855/_/961077348/ > ------------------------------------------------------------------------

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