Maker Pro
Maker Pro

L298n connecting in parallel

Guorishix

Feb 18, 2022
8
Joined
Feb 18, 2022
Messages
8
Hello! I would like to ask for some advice or help if my wiring is appropriate as shown in the photo. I am using 2 L298n motor drivers to actuate 4 peristaltic pumps (runs @400mA each, hence, 1.6A total max current when all pumps actuating). I am powering these modules using as 12V power supply in parallel and will be hooked to a Raspberry Pi microcontroller for control. I am wondering if such parallel connection would be ok and if are there any problems I might encounter since I it's my first time handling with motors for my small automation project. Thanks!
 

Attachments

  • asd.jpg
    asd.jpg
    14.6 KB · Views: 15

kellys_eye

Jun 25, 2010
6,514
Joined
Jun 25, 2010
Messages
6,514
I am wondering if such parallel connection would be ok
Providing the power supply can deliver the minimum required current you should be perfectly ok. Additional supply smoothing capacitors at the DC input of each board would help.
 

Guorishix

Feb 18, 2022
8
Joined
Feb 18, 2022
Messages
8
Providing the power supply can deliver the minimum required current you should be perfectly ok. Additional supply smoothing capacitors at the DC input of each board would help.
Alright! Thank you very much
 

Alec_t

Jul 7, 2015
3,587
Joined
Jul 7, 2015
Messages
3,587
Bear in mind that the start-up (stall) current of a DC motor will usually be several times its normal running current.
 

Guorishix

Feb 18, 2022
8
Joined
Feb 18, 2022
Messages
8
Bear in mind that the start-up (stall) current of a DC motor will usually be several times its normal running current.
I see. If I understood it right, you mean I would have to mitigate those spikes at startup and maybe use smoothing capacitors? Just like what the previous post suggested
 

bertus

Moderator
Nov 8, 2019
3,303
Joined
Nov 8, 2019
Messages
3,303
Hello,

As @Alec_t said, the start-up (stall) current can be much higher.
The start-up current can be upto 5 times the running current.
So 2 Amp for each pump.
Do you have details on the used pump?
Are there other currents given in the datasheet?

Bertus
 

bertus

Moderator
Nov 8, 2019
3,303
Joined
Nov 8, 2019
Messages
3,303
Hello,

You could parallel two channels of the L298 to drive one pump:
L298_parallel.png
The complete schematic would be this for the 4 pumps:
l298 pump control.png

Bertus
 

Attachments

  • L298.pdf
    597.3 KB · Views: 4

Guorishix

Feb 18, 2022
8
Joined
Feb 18, 2022
Messages
8
hmm, so connect the two outputs on each side? initially it would have been +out1, -out2 and vice versa, in the above schem, where does the ground go?
 

Guorishix

Feb 18, 2022
8
Joined
Feb 18, 2022
Messages
8
so in this case, i'd have only either pumps active to drive enough current?
 
Top