Hardware threshold switch for brake vacuum pump
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Re: Hardware threshold switch for brake vacuum pump
I received them last week but I'm currently busy with the 40 kWh swap. Will put them up soon.
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Re: Hardware threshold switch for brake vacuum pump
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Re: Hardware threshold switch for brake vacuum pump
I've knocked up a snapfit case for this. Not waterproof, but you could make it so with a bit of silicone. Thought it might be useful for others.
Note that the naming seems a little reversed because the way I ended up doing it - lid looks like the base and vice versa. But the board should sit inside the base with the screw terminals facing upwards.
STLs attached. Link below if anyone wants to modify (though can't guarantee that link will be there forever).
https://a360.co/3d8dWo7
Note that the naming seems a little reversed because the way I ended up doing it - lid looks like the base and vice versa. But the board should sit inside the base with the screw terminals facing upwards.
STLs attached. Link below if anyone wants to modify (though can't guarantee that link will be there forever).
https://a360.co/3d8dWo7
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Re: Hardware threshold switch for brake vacuum pump
Very cool
After all the mounting holes I forgot won't matter.
![Smile :)](./images/smilies/icon_e_smile.png)
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Re: Hardware threshold switch for brake vacuum pump
Ha! I always find the mounting holes on things are too small anyway. Even if they're big enough, that means more screws & hardware - something the Munro guys would hate. With a bit more time I would try to design it to clamp the edge of the PCB when it locks down, but not necessary on something this small.
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Re: Hardware threshold switch for brake vacuum pump
Having a bit of a problem with my unit. I'm seeing 12v on the 5v output? Wonder if the voltage regulator is bad?
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Re: Hardware threshold switch for brake vacuum pump
Just checked mine (recently received from Johu) and all looks ok, so must be a one off issue?bobby_come_lately wrote: ↑Sat Jul 24, 2021 7:31 am Having a bit of a problem with my unit. I'm seeing 12v on the 5v output? Wonder if the voltage regulator is bad?
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Re: Hardware threshold switch for brake vacuum pump
Hmmm - thank you. Will do some more testing and message Johannes.nkiernan wrote: ↑Sun Jul 25, 2021 3:35 pmJust checked mine (recently received from Johu) and all looks ok, so must be a one off issue?bobby_come_lately wrote: ↑Sat Jul 24, 2021 7:31 am Having a bit of a problem with my unit. I'm seeing 12v on the 5v output? Wonder if the voltage regulator is bad?
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Re: Hardware threshold switch for brake vacuum pump
Did you get to do any more troubleshooting with the pressure sensor? On the bench mine worked 100% as you saw in the post above. So this evening I connected the VAG vacuum pump and setup worked once, but then the pump would not turn off. Tested the brake pressure sensor on the bench again and now I am getting the same as you, 12V on the 5V connections. So first time the servo was run, something looks to blow! Had you also connected a vacuum pump?bobby_come_lately wrote: ↑Mon Jul 26, 2021 6:41 am
Hmmm - thank you. Will do some more testing and message Johannes.
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Re: Hardware threshold switch for brake vacuum pump
Ah interesting! No, not really gotten any further. I put it on the bench and confirmed 12V on the 5V but not tried to diagnose beyond that. But sounds like I might be more than a one off then. I've not actually contacted Johannes about it yet.nkiernan wrote: ↑Mon Aug 02, 2021 7:02 pmDid you get to do any more troubleshooting with the pressure sensor? On the bench mine worked 100% as you saw in the post above. So this evening I connected the VAG vacuum pump and setup worked once, but then the pump would not turn off. Tested the brake pressure sensor on the bench again and now I am getting the same as you, 12V on the 5V connections. So first time the servo was run, something looks to blow! Had you also connected a vacuum pump?bobby_come_lately wrote: ↑Mon Jul 26, 2021 6:41 am
Hmmm - thank you. Will do some more testing and message Johannes.
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Re: Hardware threshold switch for brake vacuum pump
Looks like the 1u bypass cap I mounted is not sufficient. Send me a message in 2 weeks (it might drown otherwise) and I will send you replacement boards. The new boards I tested like on the video, they have 10u caps that soak up the turnoff spikes better.
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Re: Hardware threshold switch for brake vacuum pump
Brilliant - thank you. Will drop you a line when I'm back from my holidays.
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Re: Hardware threshold switch for brake vacuum pump
Would the boards be damaged further when that cap goes, or is changing the cap alone ourselves a solution to save you sending new boards?
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Re: Hardware threshold switch for brake vacuum pump
Also happy to just swap the cap if that's an option.
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Re: Hardware threshold switch for brake vacuum pump
The cap and the 5V regulator.
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Re: Hardware threshold switch for brake vacuum pump
Turns out that there is a problem with the 5V regulator. It is specified for 15V input max, of course with some tolerance. So some boards work, some don't. A good replacement is the NCP1117-5.0 which tolerates up to 20V input.
If you bought a board please let me know whether you need me to send an NCP1117 to you or a new board.
If you bought a board please let me know whether you need me to send an NCP1117 to you or a new board.
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Re: Hardware threshold switch for brake vacuum pump
I have only bench tested mine so far using a 12V battery. I take it the problem only shows with the 12V battery on charge?
If so will this part fix the issue? I don't mind ordering and fitting myself.
https://ebay.us/QI1szE
If so will this part fix the issue? I don't mind ordering and fitting myself.
https://ebay.us/QI1szE
I need a bigger hammer!
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Re: Hardware threshold switch for brake vacuum pump
Is the bypass cap mentioned above ok now if the regulator is changed?
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Re: Hardware threshold switch for brake vacuum pump
Yes, maybe that's what saved you. Or you have a strong part. You need to find it in SOT-223 package.Alibro wrote: ↑Sun Sep 05, 2021 12:58 pm I have only bench tested mine so far using a 12V battery. I take it the problem only shows with the 12V battery on charge?
If so will this part fix the issue? I don't mind ordering and fitting myself.
https://ebay.us/QI1szE
Yes, bypass cap change applies also.
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Re: Hardware threshold switch for brake vacuum pump
Are these correct?johu wrote: ↑Sun Sep 05, 2021 3:52 pmYes, maybe that's what saved you. Or you have a strong part. You need to find it in SOT-223 package.Alibro wrote: ↑Sun Sep 05, 2021 12:58 pm I have only bench tested mine so far using a 12V battery. I take it the problem only shows with the 12V battery on charge?
If so will this part fix the issue? I don't mind ordering and fitting myself.
https://ebay.us/QI1szE
Yes, bypass cap change applies also.
https://s.click.aliexpress.com/e/_ArbeGE
Also have you a link for the caps? or can you tell me what type they are please?
I'd much rather sort this myself, then I can claim it was all my own work.
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I need a bigger hammer!
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Re: Hardware threshold switch for brake vacuum pump
Well, the part number is correct. Caps are 0805 10uF and at least 25V.Alibro wrote: ↑Sun Sep 05, 2021 9:49 pm Are these correct?
https://s.click.aliexpress.com/e/_ArbeGE
Also have you a link for the caps? or can you tell me what type they are please?
I'd much rather sort this myself, then I can claim it was all my own work.![]()
No problem with you claiming that, less work for me
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Re: Hardware threshold switch for brake vacuum pump
Thanks Johujohu wrote: ↑Mon Sep 06, 2021 8:19 amWell, the part number is correct. Caps are 0805 10uF and at least 25V.Alibro wrote: ↑Sun Sep 05, 2021 9:49 pm Are these correct?
https://s.click.aliexpress.com/e/_ArbeGE
Also have you a link for the caps? or can you tell me what type they are please?
I'd much rather sort this myself, then I can claim it was all my own work.![]()
No problem with you claiming that, less work for me![]()
So I've ordered these https://ebay.us/RoMbgm and these https://s.click.aliexpress.com/e/_ArbeGE
I'll report back when they arrive, probably around 8 weeks from now. Maybe by then I'll be far enough on with my build to need them.
But probably not.
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I need a bigger hammer!