L298N and arduino powered from same source

Thread Starter

SeanV123

Joined Nov 12, 2020
108
I’ve done it many times. There is a limit to how much current you can draw, however. Check the specs because I’m not sure how much the limit is. I seem to remember that it’s less than 200mA. The logic for your IC should be well within the limit as long as your not using the Arduino’s 5V to run the motor!
is the 200mA draw for the arduino or the l298n?
 

djsfantasi

Joined Apr 11, 2010
9,181
The Arduino supplies current; the L298N draws current.

I checked the specs for an Arduino Uno r3. The Arduino can supply up to 500mA from its 5V pin (the limit from its GPIO pins is 40mA per pin; 200mA aggregate). I’ve let overhead for safety and the 200mA current needed by the Arduino.

Which means when powered from the Arduino, the L298N can draw up to 500mA. A signal to the L298N must be less than 40mA; 20mA typically. Depending on what currents the other pins are drawing…
 

sarahMCML

Joined May 11, 2019
392
L298 data sheet says max draw on logic Vcc is 36mA. Arduino board would have no problem supplying this.
I've just tried my setup here using the Arduino Uno to power the L298N. It's running a 12V motor at 0.5A (from a separate PSU, of course!), but the Arduino is only using a total of 27.5mA, even supplying the L298. No trouble at all. Just remember to remove the on-board power jumper!
 

Thread Starter

SeanV123

Joined Nov 12, 2020
108
I've just tried my setup here using the Arduino Uno to power the L298N. It's running a 12V motor at 0.5A (from a separate PSU, of course!), but the Arduino is only using a total of 27.5mA, even supplying the L298. No trouble at all. Just remember to remove the on-board power jumper!
Cool, thanks very much
 

Thread Starter

SeanV123

Joined Nov 12, 2020
108
Cool, thanks very much
I've just tried my setup here using the Arduino Uno to power the L298N. It's running a 12V motor at 0.5A (from a separate PSU, of course!), but the Arduino is only using a total of 27.5mA, even supplying the L298. No trouble at all. Just remember to remove the on-board power jumper!
I will be powering 32 transducer from each output. The 32 transducers will draw around .8A
 

sarahMCML

Joined May 11, 2019
392
The outputs that would power the motors from the l298n
I'm unsure what you're needing here. The motors are connected directly to the transistors inside the L298N.
Are the transducers to be powered from 12V, or the reduced power to the Arduino (maybe 7.5V), or 5V? In which case if they total 800mA, you will need to regulate a separate supply derived from your main 12 volts.
It would help to know what the transducers are?
 
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