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Controlling high amp motors with arduino? Answered

Hi instructablites/instructonians/people of instructables... Despite the fact that i suck at naming things, i need to control 2 6v 3a motors, and i'd prefer to use arduino. the l293d only rates up to 1.2 amps, and i'd like to use as few components as possible. i'm relatively new to this, so please bear with my nooblishness.

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steveastrouk
steveastrouk

Best Answer 7 years ago

If you only want on/off then just use a couple of SPDT relays, a couple of transistors (or a ULN2803) and a couple of diodes.

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steveastrouk
steveastrouk

Answer 7 years ago

Here's the relay layout. The switches on the coils should become transistors. IRL 540 mosfets are nice there too. The relay coils need a diode across them - with the marked end of thediode to the +ve supply.

motorrelay.jpg
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dasta
dasta

Answer 7 years ago

AWESOME!!!! thanks :-) this should work

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steveastrouk
steveastrouk

Answer 7 years ago

Don't forget to vote for best answer ;-)

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Jayefuu
Jayefuu

7 years ago

What motors? Do you have a link to the datasheet?

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dasta
dasta

Answer 7 years ago

here's the specs:
Rated voltage: 6V DC (min. 2V Max. 7.5V)
Stall current maximum 5.5A
No load current per motor is 350mA
Motor RPM is 10000 +/- 5%

the place i'm buying them from doesnt have much more info. here's the link to the product i'm getting.
http://www.netram.co.za/Electronics/Mechanical/Wild-Thumper-Motor-with-341-Gearbox.html

the motors will be pulling quite a bit of weight, which is why i need the higher current options.

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Awesome-aniac
Awesome-aniac

7 years ago

Does it have to be reversible?

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dasta
dasta

Answer 7 years ago

unfortunately, yes. it does.

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Awesome-aniac
Awesome-aniac

Answer 7 years ago

Maybe you can just stack the l293d. Or build an h-bridge driver from scratch. I couldn't find a readily available product, but I bet there's one out there somewhere.

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dasta
dasta

Answer 7 years ago

awww man :-( oh well, i'm sure i can just use a series of switches. saw a design using MOSFETs. the l293d is kinda expensive here in SA. like R30. maybe by international standards, it's not that expensive, but as a broke hobbyist, it sucks.

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steveastrouk
steveastrouk

7 years ago

There are other offerings from ST or Allegro that can handle 3A in one package, or you can make a discrete bridge with MOSFETS.