Ok thanks for clarifing.
I’m not sure what you mean by “secret device”? Apologies if this is how it seems, but the simple answer is that it is a speed controller. For my intention I don’t have an ability to modify it beyond where the switch plugs in (effectively just replacing the switch). I didnt think the device mattered, as the function I am trying to solve is turning it on/off, and doesnt affect any operation beyond that? Reason behind it is that this speed controller setup hasn’t been designed to work in the case I am using, and ultimately the “standard” switch for this case. The case is also another replaceable spare part (not a one off custom item) so to be able to replicate this operation again I need a component that can link the speed controller power switch, to the stock item supplied with this case. Unfortunately the standard power switch for this speed controller will not fit into the case intended without redrilling or major modification, which affects the visual ‘original condition’ of the whole product. The speed controller setup that usually goes in this case is no longer in production, so think of it as trying to give the product a second life through a newer speed controller…?
The “original” switch for this speed controller has two distinct states; when it is depressed the unit is on, when it returns it is off. I believe it is a Toowei 4000 series switch, and tests to be latching if put across another circuit. Picture and plug attached, yellow tape marks the positive signal wire:
The switch on the case appears to be a generic “clicky” push button momentary switch (Pictured previously in my current circuit). It is only completing the circuit when it is depressed, and in its original function I believe it’s latching was done in the original device. This is the switch I am trying to get to function with this newer speed controller.
Using the pins from the toowei switch, identified in the labels above (speed controller board doesn’t label these pins, hence my “ABCDE” nomlacture), if I connect my multimetre to each combination of pins on the speed controller I get the following results: (Table updated due to comments in next post)
IMAGE REMOVED TO AVOID CONFUSION WITH INACCURATE MEASUREMENTS
Please see posts below
First major comment - seeing 37V readings from these pins makes me aware the Pololu unit I am currently using may not be capable for this solution, the MAX voltage is listed as 20V, though any of the larger Pololu boards may work as they are rated to 40V. Max battery charge is 42V, so open to guidance here.
In normal operation:
LED+ connects to Pin A
LED- connects to Pin B
Pin C has not been previously used by the original Toowei switch, but is an active pin on the speed controller.
Switch- connects to Pin D
Switch+ connects to Pin E
The combinations of +A-B,+A-C,+B-A,+B-C, (A&B being the LED pins) when the D=>E circuit latches these readings ‘go crazy’ fluctuating by around 1-3V. I do find this odd, though can explain why the LED “flashes” when this is connected?
Do these voltage readings identify a ground pin? Does this open any other possibilities (relay)? Unfortunately, just reverting to the ‘normal’ switch for this speed controller defeats the purpose of this project.
Again, apologies if this info is somewhat obvious - I am very fresh to this side of electronics. I appreciate the help.