I have a project constructing a tank with tracks and moveable turret firing a red laser. There is target incorporating a LDR fixed to the tank to record laser hits to the tank. Ambient light levels are determined and whenever the light level rises appreciably above the ambient light then a “hit” on the tank is recorded. The problem is that the LDR readings jump by about 20% whenever the tank is moving (i.e the motors are running drawing current).  This increase looks like a laser hit to the tank when it is not.
The Tank is composed of:

1. 2-18650 3.7v batteries wired in series delivering 7.5v
2. 2-32GB-520 6-12v motors for tracks.
3. 2-MG90S servo motors for the turret
4. L293D 16-pin IC Stepper Motor Driver Controller
5. LDR Photo Light Sensitive Resistor Photoelectric Photoresistor w/ 10k ohm resistor
6. L7805CV Voltage Regulator 5V
7. ESP-32

 
The ESP-32 and the L293D run on 5V from the L7805. The motors operate on the full 7.5v battery pack. The LDR operates from the 3.3v pin on the ESP-32.
The tank draws 165mv when on and not moving. It can draw up to 450-500 mv when moving full speed.  Ambient light levels generate ~1.6v under no motor load but when the motors are running the light level immediately jumps to ~2v.
This effect occurs regardless of adding 50Uf capacitors to the in/out pins of the 5v regulator. I have also tried powering the LDR with a completely separate power source so only the common ground and the LDR signal are involved.
I can provide fritzing if someone has any thoughts that could help.
 
Thanks
SacCha