I'm new to this world and I'm trying to make a autonomous robot to chase around my cat.
I bought a chinese electric car, a sharp sensor, 2 LDR and an arduino uno.
I was able to put everything together and the robot is running. I'm currently controling speed of the motor with a L293 and PWM output signal.
My problem is when I put the PWM outputing about 150, the motor runs slowly like I want but gives a high frequency pitch. If I go lower than that the motor just gives the pitch and doesn't move. If I go higher the motor runs fine.
Does this kind of behaviour ruins the motor longevity? Should I always run it at full speed? What about if I hook up a digital potentiometer to control the speed, would I still get that pitch from the motor?
The high-pitch noise associated with PWN motors seems to be quite typical. When I experimented with it, I was told not to worry. A saviour/knowledgeable response is bound to be posted. But for the time being I wouldn’t worry too much.
I’ve noticed if the PWM if too low the motor only starts if I give it a little push with my hand or if it was already running. Is there some way to give a “kick” to the motor to always start no matter what the speed is?
Should I put a diode somewhere to protect my arduino? The motor is running with an external source through the L293 and he goes back and forth, left and right, a lot of times and I don’t want to fry anything. I already gave a delay time in the software when the traction motor goes reverse, but the left and right motor doesn’t have a delay.
Well each motor as a stall current value, and in laymen’s terms this means that a motor to start running has to achieve said value so that it does start to spin, in other words it’s kind of like the activation energy.
