Car using arduino uno and relay 4 module

I made car using (Arduino Uno, relay 4 module, Bluetooth module and 2 DC motors). I am using 2 (9volts) batteries, one for the arduino and the other one for the motors, but now both are (8.8 volts).

The problem now is when I connect all components the relay doesn't work.
I have attached the code and circuit on Proteus (ISIS professional)

CarMini.ino (1.43 KB)

Hi,
What type of 9v batteries are you using, not the tiny square things I hope!! You need a lot of current to drive 2 motors and the other stuff too.

It would be better and easier to use a proper dual motor driver module but try to avoid the L293 type, their not that good, and lose power in the output transistors, use a DRV based one with FET outputs.

Hope it helps.

Mel.

I'm using Eveready 9volts battaries

Hi,
Has I said their completely useless!! get at lest 4x AA high capacity rechargable cells, Nimh would be best, 2x Lith-ion, these are 3.7V each, so smaller and lighter, but need a special charger.

Take a look here at my bots: www.melsaunders.co.uk under electronics

Regards

Mel.

Thanks a lot for helping.