So guys I had setup of rc car .I am using 4 motors , l293d driver ,ardunio Uno board and an hc -06 Bluetooth module for connection. The problem is after setting all if I supply current through batteries the l293d driver and ardunio is working but Bluetooth module is not working , instead I am giving the supply from power Bank the Bluetooth module and ardunio are running but l293d driver is not working..please tell me an solution
Have you tried removing the shield power jumper and powering the Arduino and the motors separately?
You mentioned using a Power Bank. If this is a USB Power Bank, it will not power the motors (except for servo motors). So it would make sense that your motors did not work.
Without a connection schematic it is difficult to determine why the HC-06 isn't working when the battery is the power source. It would be good to try a separate power source for the Arduino and the the motors, but make sure you remove the power jumper first!
You're brave, constructing a battery pack from three LiPo cells that are unprotected according to the peeled one, into a cheap spring holder with thin wires. If there's a stall on the motors then expect some melting/fires somewhere.
