Motor rotation

Using Arduino General Electronics
#1

Dear All Have a nice day

I make a line follower robot using Arduino Nano and TB6612FNG Motor driver. It is working but only issue is when the motor rotate manually that power goes to LED near 7805 regulator . please advice how should I manage to stop it

my reference schismatics is attached

I am using LM2695 regulator instead of the schismatics power supply

Please advice

Thanks in advance

3pi-schematic.pdf (470 KB)

#2

The obvious thing would be a diode in the Vboost line to stop the backflow of current but that may have side effects such as a too low Vboost, overheating diode, etc. This based on what I see in your schematic and the rather vague description of the problem so I may be very wrong here.

The schematic you post doesn't make much sense to me - especially components U4 to U8.

#3

PA3040:
but only issue is when the motor rotate manually that power goes to LED near 7805 regulator . please advice how should I manage to stop it.

So are you saying that the motor is acting in a voltage and power generating mode?

Maybe you can add a switch of some sort… so that when you manually switch off power to your system (via a manual switch), then it doesn’t only switch off the power, but also disconnects whatever you want to disconnect…such as your motor. eg… DPST switch, or maybe DPDT switch.

#4

Manually turning a motor can feed voltage back out of the TB6612FNG VM1,2,3 pins back into the VBOOST line, no EASY way to prevent it.

#5

add diode in series with motor, you can rotate motor only one direction

#6