current leakage

Hello everyone, I am working on a small project using ATMEGA328 (AM for short).. I use a voltage regulator to power the AM and then one of the output pins of the AM is connected to an LED+ resistor and Ground. I power my AM using an L7805 voltage regulator and I noticed that when the ground in...

Wireless remote control car. Motors turn on upon connecting batteries to the circuit (Reciver), while remote controller (Transmitter) turned off (Not connected any batteries). Not a slightest clue of what to do in this situation, any help would be greatly appreciated.