Thank you sghioto, here attached the picture inside:It's probably just a mechanical lever to operate a switch that is mounted on the PC board.
Post a photo of the inside of the controller, PCB
Thank you sghioto, this definitely make sense. one thing I still not clear is:On the PCB the two black rectangular parts are labeled S5 and S6.
Edit: Surface mount reed switches actuated by small magnets inside the lever
Thank you MisterBill2.So what is the reason for digging into the controls? Has some function failed? It is clear that this is not a simple control head. If there is a problem please describe the problem, only then will any advice be more than just a guess.
Is the unit still working?The reason for digging into the controls is trying to reuse and modify it into 433MHz RC controlled, the start button is the first thing to dealing with.
Thank you MaxHeadRoom,Is the unit still working?
If so I would have though it would be worth cleaning it up and selling as a spare unit rather than canabalise it.
There are Many 2dir/4dir joysticks on ebay for <$10.00 that should suit the purpose..
Thank you MisterBill2,What is it that you are wanting to control with this? Are you hoping to repair a wheel chair or similar device? Replacing linear hall effect devices with a resistor control does not seem like a wise choice, and it would require a different interface to the controls logic. So it is not simple nor cheap. And we still have no idea why you want to do this.
Thank you MisterBill2.OK, now I have an idea as to what the goal is, and I have a suggestion which is to abandon the idea of a traditional joystick and instead have a forward-reverse switch, which is that control, and a separate speed control and steering control. Consider that in a real car you have separate controls for speed, braking, forward/reverse, and steering. The steering and speed can still be on the one stick, with the direction selection being a separate switch.
And still I have a question about the link from the controller to the drive package. Is that a bundle of wires, or is it a digital link? And what sort of control scheme do you intend to use for the radio control link? The standard radio control scheme is not like any other scheme used anywhere. The standard radio control arrangement uses a string of pulses, the width of each pulse varying the analog control value of an analog servo device. I don't see how that would relate to what you are going to have to be doing to steer by adjusting the speed of the two drive motors. Converting the wheelchair drive does seem like a good approach, but the steering scheme would be quite different. That could be a quite powerful RC car if you use the same motors, though.
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