a few weeks ago I wanted to throw my old (more than ten years) RC Car away. But since I'm totally interested in arduino I wanted to give it a try.
So, fact is my motor (forward / backward direction) has to speed modes.
By direct connection to 4.8V DC (the batteries are a bit fuller: around 5 V)
- in the first one: 0.6A and 4.8V
- in the second one: 1 A and 4.5 V
I still have some L293D lying around. But I dont think they fit (with 0.6 A and peak 1.2 A, I think)
Has anyone done something similar? Is there a better way to control the direction of the motor?
THX to every helpfull answer.
If the car still works, why not use the existing components, there is a long thread here on doing this, I think it was titled 'Modding an RC car'
the big problem is that the old PCB was totally covered with some kind of resin and so it was unuseable.
So I had it connected to the L293D. The Logic Power (+5V) came from the arduino and the motorpower came from the batteries (4.8V) But I have measured only <1V across the motor and current was 600mA.
I’m a bit confused about the voltage loss…
This is far from a definitive answer, but if the motor is running, it is also acting as a generator, generating a 'back emf' search the web for this term and it may explain why you see a smaller voltage drop than you expect.