So it finally arrived in the UK and now I am trying to wire

3D Printing
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So it finally arrived in the UK and now I am trying to wire up a set of FSR pressure sensors to the replicape. Trying to be ultra cautious and not blow something up but how would this hook to the replicape z-min endstop?

The FSR board gives a constant 3.3v when NOT triggered on the sense pin but when triggered (pressing on it) then it goes to zero volts. Measuring the z-min pins on the replicape one pin shows 5v so I am assuming the other is ground.

Would the sense pin simply go to the 5volt pin on z-min and the two grounds link? Rev1.2 is the board I am using from here https://github.com/johnsl/fsr_endstop which seems to indicate 3 pin endstop connections.

EDIT: I am just full of fail today, was looking at the Rev A board and not Rev B. Still is one of the pins on the 3pin socket the best for the sense output? http://wiki.thing-printer.com/index.php?title=Replicape_rev_B

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Your board can probably run on 5V as well, in which case you can simply use any end stop. But double check that.

3

Okay so after holding my breath and not blowing anything. I have used the inductive end but should work with the others. The FSR board sense goes to yellow(sense) on the replicape and the positive and negative to red and black. The FSR’s work a treat and super sensitive. The hot end just touches the glass and it immediately triggers.

Only use the 5 volt on the inductive plug if you use it. Ignore the 12 volt pin.

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Great! Post a video!

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Just need to tidy it up a little, wires every where and looks like a birds nest. Will post a video of it soon.

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I know its still a wire mess but it did look worse before this. Replicape is not in the shot as it is underneath the printer.

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Hello Pieter, Do you have any video? Is FSR working with replicape?

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Nice to know FSR is working with replicape. How many FSR did you end up using?

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Being a delta it is 3 under the bed with the effector pressing down.

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I’m actually surprise that it triggers almost instantly in your case which gives me hope for mine :slight_smile: did you have to turn the FSR off while printing?

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The movement can cause issues so the FSR is only used while checking. It is set in firmware to be ignored while printing.

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If you have the FSR already pinched before the nozzle pushed the bed, does it cause any confusion where the controller think that the FSR has been triggered from the get go?

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@Step_Cia the weight of the bed just provides a light preload so helps triggering. The binder clips are actually not pushing down on the glass but just holding the glass centred.

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Thx i was wondering how much per loading to apply it seems the more the better as it became more sensitive. Is there a setting in redeem to tell how much preloading of the FSR or redeem doesn’t care if this is FSR?

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The replicape is just using the standard triggering like a micro-switch because i use a separate trigger board for the FSR sensors.

The jumpers adjust the sensitivity and if you need ultra precise triggering then the firmware can be reflashed.

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Ok I didn’t realize separate trigger board for FSR is needed… I’ll try to look for it thx

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Not exactly “needed” but like inductive probes it save a whole headache having it. (E.g) having it built into the replicape for inductive probes.

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Just got the same FSR board. Where did you put your jumper? The lower number should indicate more sensitive right?

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@Step_Cia https://github.com/JohnSL/FSR_Endstop

the link is to the github design and readme. down the bottom of the page it shows the jumper options.