Power an Arduino and 2 DC motors by a L293D

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Shavemen
Posts: 2
Joined: Tue Apr 11, 2017 2:03 am

Power an Arduino and 2 DC motors by a L293D

Post by Shavemen » Fri Jun 16, 2017 9:57 am

I got a 6 AA cell pack. So I can basically get 8.2V.

I need to power an Arduino and 2 DC motors driven by a L293D.

My Arduino can accept 7V to 12V DC input and the L293D between 4.5v to 36V.

Can I simply deviate another line from the cell pack and feed the L293D with it? I want to do that because the load of the two DC motors can quickly be around 200mA/motor, the 5V input is 500mA max, I've got other things to feed with (one servo, an IR sensor, some leds and two other sensors) so I can quickly be higher than 500mA.

Something like this:

Image

aqibi2000
Posts: 5
Joined: Sat Nov 04, 2017 8:54 pm

Re: Power an Arduino and 2 DC motors by a L293D

Post by aqibi2000 » Wed Nov 08, 2017 3:49 pm

Shavemen wrote:I got a 6 AA cell pack. So I can basically get 8.2V.

I need to power an Arduino and 2 DC motors driven by a L293D.

My Arduino can accept 7V to 12V DC input and the L293D between 4.5v to 36V.

Can I simply deviate another line from the cell pack and feed the L293D with it? I want to do that because the load of the two DC motors can quickly be around 200mA/motor, the 5V input is 500mA max, I've got other things to feed with (one servo, an IR sensor, some leds and two other sensors) so I can quickly be higher than 500mA.

Something like this:

Image

You can indeed isolate the VS to the L293D and add the higher voltage (obviously add the common ground between everything and seperatea the Arduino power connection to ensure compliance with the limits of: 7V to 12V DC input and the L293D between 4.5v to 36V).
Send the regular VSS 5V voltage from the Arduino 5V output.

You could power the Arduino from a separate power pack entirely if you wanted, it's just important to ensure the grounds are common.


With regards to tapping off at a different cell that's perfectly fine, the only time you'll have an issue is was a rechargeable battery PACK where the charger may see some cells as over depleted, however if normal batteries then don't bat an eye and get onto it.

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