Let's Make Robots!

rc tracked monster vehicle

 
climbs hills, plows my garden...
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Hello,

I have already had electric and gas rc cars, buggy, monster truck... And I wanted to build my self a tracked monster that could go quite fast, climb about anywhere, something unstopable... So I started to build a tracked monster. I started by the electric system.

it will be about 25 kilos, 60cm long, 30cm wide and 25cm high.

The whole system is is controlled by only two servos.

It will have one motor for each track, steel chassis, golf caddy battery, tracks made of timing belts and U alumunium profile, transmission by car' s water pump...

motors are 12V 24Amps at stall and 6Amps running free.

At this point I have only finished the electric system and I am going to start the chassis, tracks and suspension soon.

 

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Je suis Canadien,Québécois. Il n'y a pas beaucoup de roboticiens ici qui parlent francais je pense. J'ai débuté avec PICAXE il y a quelques mois pour m'amuser un peu et ensuite je me suis procuré Arduino pour l'étudier pour éventuellement l'utiliser sur un robot.

Salut, je vais continuer a suivre ton projets.

Korel

This is probably a stupid question, but couldn’t this be done using say a H-bridge driving some massive MOSFET transistors? Am I wrong thinking that you only have full on or stop, -or can you PWM the speed?

  

In fact, I' m sure there are many other ways to make it work!

It works like a h-bridge but I' m using only 2 relays instead of 4 for a h-bridge. I' m not using transistors because I don't realy know how they work and how much power they can resist to... The PWM unit has an integrated soft start, motors take speed untill the chosen speed is reached. Max speed can be adjusted on the side of the wooden box with a button. If you are doing speed or if you are doing trial, climbing you change speed... The important is that my system is working way under the limits of the parts, even if it does take a lot of place, I must admit!

Hope you understand everything, because this it not my language.

h-bridge for 2 motors: 8 relays

Don’t get me wrong, I think your relay setup is great and something I haven’t seen before here at LMR. I would only like to mention that for example the MOSFET IRFZ44N is rated to handle 49A at 55V and might be though enough to handle the job.

wow cool! seems to go quite fast... will follow this. Where are the diodes used for?

edit: for mixing the signals/directions I see now.. Like it!

Dannyv, this should help you. Its the simple version of the system.

For exemple if you push the "left" button it will only comand the "motor right+" and the "motor left-" relays. So the left motor will turn forwards and the right motor will turn backwards, so the robot will "pivot steer" to the left. Diodes are there so as the microswitches controls the right relays and not all the relays in the same time. All the other diodes are there for the soft star and pwm system, to use 1 unit for the 2 motors.

 

Looks like it is going to be a powerful one. I'll definitely be following your progress.