H5 speedo / servo driver

[Mouldy]

Hi,

Im after a george francis H5 to use as a spair if i ever fix the one ive got thats broken.

It seems like these are like gold dust, the only people who seem to use them anymore is me and grant cooper and maybe ed hoppit?- if anyone out there has one sitting about please contact me, even if urse is blown up i might be interested.

Regards
Dave Moulds

[m2xt]

Re: H5 speedo / servo driver

Hi Dave, I'm sure I have got a couple of the H5's in my drawer at the workshop. I'll check tomorrow to see if they are H5's as there was two models IIRC. Really nice controllers, just never got around to using them.

[blazerbotics]

Re: H5 speedo / servo driver

Does anybody make an interface board that goes between RX and speedo, to create a jumbo servo? Surely it wouldn't be too complicated and means you could use anysize speedo.

[Mouldy]

Re: H5 speedo / servo driver

Paul - thanks id appreciate that, Although im sure i remember you saying you used H6's in TKM2 if thats were you think you have them?

Alan- if you find one let me know lol, that would be alot easyer. The only other alternitive ive seen to the H5 is the pololu board technobots sells.

If anyone knows of anything similar that can handle 10amps then id appreciate it.

Cheers

[mark_m]

Re: H5 speedo / servo driver

I tried making one recently using a sabertooth and a picaxe. Easy to do but the update rate is to slow for a quick servo. I was using a drill motor and gearbox as the output with a ten turn potentiometer. So to the picaxe it should have looked like a ~90rpm servo (~0.1sec/60degrees) but it was too fast and the ADC resolution too low - it kept oscillating unless I made it slow down a lot. I've got plans to try again with a faster microprocessor which should be no more difficult.

[woody]

Re: H5 speedo / servo driver

It's entirely possible to use a std r/c servo board as an interface.

http://130.94.182.150/mowers.htm

BUT as Mark said the driven motor/potentiometer speed needs to be fairly slow.

[Mouldy]

Re: H5 speedo / servo driver

yeah, slow is the problem, i worked out that it should selfwright in 0.8 seconds..

If paul hasnt got any H5's ill probably just go for an electronise 12amp with limit switches...

[m2xt]

Re: H5 speedo / servo driver

Hi Dave, you have a better memory than me, yes I have a pair of H6's that must have been used in TKM2. I did find a single H5 though, I would have to dig out some instructions to make sure it still works though. As for your other thread, the regulator is a 15V low drop out type and is generally available. Technobots do the 5V and 12V versions but not the 15V one although I can get them. You just need to source a LM2940CT-15.

I think I need a clear out as I seem to have quite a few spare bits in my personal stash, even the odd new Roboteq or two!

[m2xt]

Re: H5 speedo / servo driver

Just noticed that it has 12V written on component side in the top right hand corner. This I assume means it's a 12V version, what do you have Dave?

[woody]

Re: H5 speedo / servo driver

I would have to dig out some instructions to make sure it still works though.

The instructions are still available.

http://www.gt-electronics.freeserve.co.uk/prod/tech.htm

[Mouldy]

Re: H5 speedo / servo driver

Paul, let me know how much you want for your H5 and ill paypal you the money.

The top of my board was filed down because it was to big to fit in the robot lol.. only about a mm of the top of the board but the marking has gone..

Although it would make sense if mine is a 24v one as i bought two at once from Ed hoppit, one is in ploughbot and he runs on 22.2v and doesnt have trouble with it.. and i run on 4cell lipo (14.8v).. although when i got it i remember hooking it up and the LED's did originaly came on from my 4cell lipo...I must of shorted somthing out ages ago and forgotten about it.. That or the christal for the chip might have got damaged- not sure.

Dave gamble's said he'll have a look at it for me, he's repaired a few in the past. ill get him to convert them both to run on 15v if he can aswell as repair it if its broken. Ill keep one as a spair.

In all honesty electronics have never been my strong point. Wiring things up in fine with but when it comes to messing about with circuit boards and pic's i never seem to win.

Regards
Dave

p.s. any chance of a return for TKM2?

[m2xt]

Re: H5 speedo / servo driver

Thanks for the link Alan.

Dave, Board tested and works in speedo mode fine, I didn't try the feedback mode. Drop me a line at paul(at)m2xt(dot)net with an offer if you are still interested. As for a return of TKM2, I need to return first! I still have it on the shelf but the last job I did on it was to take out the Feather Golds and put in some smaller motors as it was over weight. After that it was not as good as it couldn't do the power slides any more. Also it would not stand a chance against todays spinners or flippers but I still intend to get it going again for sentimental reasons. Of course with the new weight limit, I could armour it but no, as far as I'm concerned, real British feathers are 12kg max, I don't want to build to any of your over-weight American rules .

[Mouldy]

Re: H5 speedo / servo driver

lol nice attitude, i wasnt fond of the weight change either. Dont see the point as i could get 360 in weight with 4wd, 4kg disc and a selfwrighter. no real need for the exstra but ah well.

Will send the e-mail now paul. Thanks for the help