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does the controler you want to use change the motor direction in each pair of wires

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From what i imagine you want to switch two seperate pairs of relays with the four origional motor wires

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oK im sure Glen can follow your expert diagrme easily enough ..

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Originally posted by Totaly_Recycled:
oK im sure Glen can follow your expert diagrme easily enough ..

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Assuming the green block is the lego controller, then Glen's original diagram is correct.

The paralell diodes are used for clamping negative-going spikes caused by relay-coil kickback.. if you wired two relays in parallel with diodes like that, the output from the Lego controller would be shorted whenever it tried to go over .6v.

With the diodes in series, one relay will conduct with one output polarity, and the other when it reverses.

Of course that only gives you bang-bang control, rather than the PWM of the servo-board driven rig, and the servo-board gives you a semi-failsafe rig, since when it loses the radio signal, the Fets stop driving, but a couple of diodes are a lot easier than hacking up some servo's if the motors are lo power.
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No wories Glen i Asumed you were useing 5 volt relays to switch the 12 volts and wanted each pair of wires to control fowards and reverse on a seperate motor which my diagrme will do .I just drew in the under side of the relay showing the actual conectors to make wireing easier i dint draw in the second set of relays as they are just a duplicate of the other set .

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Aaron. Jason has said he'd like me to work on designing an updated IBC with him sometime in the future, but we havent started on it yet.

I have a few new ideas I could incorporate into a controller, but cant really see a "gap" in the market that needs filling at the moment. There are plenty of controllers just above the IBC in price and features wise available from overseas, so there wouldnt be a lot of point in it. Thats why the MMC's never made it to market. its difficult to build them in Australia at a competitive price given our very limited market. You can just buy OSMC's which the MMC is a slightly improved version of..

If someone knows of a feature or controller that they would like that doesnt already exist, let me know, but no, you cant say "I want this and this and this for less money than that controller".. Brett's post from the All Terrain Thread

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Ok, some controller advise please and/or mechanical. I have designed a lifter bot with a front lifting wedge. I'm looking @ moving this wedge with a banebots 256:1 gear-motor( http://banebots.com/osc/product_info.php?cPath=36_63&products_id=233 ) and further 2:1 gearing via chain and sprockets.

Make sense?

I would like to have servo like control over the motor, and to be able to go up & down(above and below bot). Using the spring loaded stick on the radio for self centering(as in level with the ground).

What type of motor control should I be looking at? Also do I need to have the wedge self center(level with the ground) with springs or similar.


Also thanx to Aaron for design tips so far.

Andrew Aidulus has modified a servo board to act as a speed controller. You might be able to use Andrew's method and combine it with a feed-back pot to do what you want. You would also need a failsafe to be legal.
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To have a servo controlled lifterwedge could be interesting. The controller is fairly easy, but I think you'll have problems with the motor itself, making a motor act like a jumbo servo requires a lot of stalling to hold it into place under load, I think you might just find that a problem. Using a Worm drive would probably be the easiest cheap solution and you could get away with just a relay H-Bridge.
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just short the motor wires together when theres no power to the motor with a reduction up in the hundreds it would be hard to back drive the lifter with the leads shorted....
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Would I be stripping gearbox's easily then Glen?

What about the wedge returning to ground level automatically Aaron?

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What about the wedge returning to ground level automatically Aaron?

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has anyone found windscreen wiper motor gearboxs with steel gears in them?

Andrew A has 4 x XF Falcon motors with hand made metal gears in them... Talk to him about them
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does anyone know about those pic-relay speed controlers (lik where do u get them ect) and for ur prob why not just use microswitches to stop it if it gets to hi or low
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