Let's Make Robots!

Motor driver

Well.. Ever since I found this page (through ing.dk) I've been dying to build my first robot.

I have bough all the parts I need, and i've been trying to modify an RC toy car, but i have blown up the motor driver in it :D. I tried with the 293D, but it couldn't take the current. So right now i'm just stuck...

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

Of course you should buy local (du kan bare gå ned i Brink hvis du bor i KBH) - but hey - this is an INTERNATIONAL SITE :D

I personally HATE entering a site where people start talking their own excotic language, so I will refrain from ever doing that again (And the translation was: They will have it at Brink, in case you live in Copenhagen)


I cannot tell how much current / how high a voltage it takes for the relays you link to, to switch on / off? You need a relay that only needs 5V to switch on/off - and then of course one that can handle the V's & amps that your motor swallows.

Damn, it is tempting to just write Danish, knowing you are from Denmark :D But let us not, thanks :) (PM me if you want) 

Hey Drixx - you may be interested in having a closer look at my comming project "Wall Racers" (am just uploading final video now etc) - I use relays, am so sick and tired of L293D, that bitch! It also has a 1,5V drop!

And H-bridges does not work for me - too complicated, expansive, or I fry them as well :D

Relays, my friend. That's the way if you are as stupid but eager for power as I :D

Will make walkthrough!

Hi Drixx,

Do you know what kind of motor is in your RC car? The L293D can only sink around 1 A or so and it is very likely that your RC car's motor eats a lot more current for breakfast (maybe in the order of 20 A when stalled). Maybe you should look into a high power motor controller / h-bridge (either buy or build whatever you feel most comfortable with).

Information on H-bridges if you don't know them (these are for low power h-bridges though):

H-bridge tutorial from Chuck McManis

H-bridge tutorial from David Cook

- Jimmy