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Raspberry Pi Dagu Rover 5 4WD driving issue

Hi there,

I'm very new to robotics & I'm having an issue getting the Rover Wheels to spin properly. I've been able to get it to turn only in 1 direction, but only 1 channel at a time. When I attempt more than 1 channel, either they both slow down drastically or 1 stops turning while the other spins very slowly. (I guess this is a sign of power drain)

Below are a list of the parts that I'm using:

Uses an analog input pin to capture a digital signal from a 3V sensor for use with a 5V microprocessor
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