Hi folks, first post/question;
I have had a search aroud here and t'internet in general and have not been able to find an answer.
Situation:
I've built a simple MOSFET H-Bridge to drive a motor forwards and reverse. I want the motor to run forwards for x time then reverse for x time. It needs to be an automated setup, but, without Arduino or any other uc's.
I've tried setting up a transistor astable multivibrator to flip between each set of gates on the H bridge, which works...but I also want the input to the H dridge to be a PWM signal. I've sent PWM signal to that transistor astable, I've experimented with hooking the H Bridge up to V+ which was a PWM signal all sorts...but nothing seems satisfactory. There must be an easy efficient way to alternate between the two sides of an H Bridge (running motor CW then CCW) whilst also giving the H Bridge PWM(so I can vary the speed)...all without Arduino or other uc's.
I've simulated a 3 x 555's setup in Circuit Wizard, 1st 555 is a slow astable at the frequency I want, that alternatively sinks and sources power to the other two 555's which in turn power the H Bridge. Results were flaky and I'm not sure I shoud breadboard it.
I have this feeling that I'm staring the answer in the face but cant see the wood for the trees and would truly appreciate some input here...I need to crack on with this project.
I hope I've managed to make myself clear as to what I need, please feel free to ask me anything that would help you to help me. Thanking you all kindly in advance.
I have had a search aroud here and t'internet in general and have not been able to find an answer.
Situation:
I've built a simple MOSFET H-Bridge to drive a motor forwards and reverse. I want the motor to run forwards for x time then reverse for x time. It needs to be an automated setup, but, without Arduino or any other uc's.
I've tried setting up a transistor astable multivibrator to flip between each set of gates on the H bridge, which works...but I also want the input to the H dridge to be a PWM signal. I've sent PWM signal to that transistor astable, I've experimented with hooking the H Bridge up to V+ which was a PWM signal all sorts...but nothing seems satisfactory. There must be an easy efficient way to alternate between the two sides of an H Bridge (running motor CW then CCW) whilst also giving the H Bridge PWM(so I can vary the speed)...all without Arduino or other uc's.
I've simulated a 3 x 555's setup in Circuit Wizard, 1st 555 is a slow astable at the frequency I want, that alternatively sinks and sources power to the other two 555's which in turn power the H Bridge. Results were flaky and I'm not sure I shoud breadboard it.
I have this feeling that I'm staring the answer in the face but cant see the wood for the trees and would truly appreciate some input here...I need to crack on with this project.
I hope I've managed to make myself clear as to what I need, please feel free to ask me anything that would help you to help me. Thanking you all kindly in advance.