min endstop

Hi,

I am trying to use LSR with a delta printer an marlin firmware and ramps 1.4 to do autoleveling and also stop the printer in case of to big pressure on the bed (ie stall motor).

The printer works perfectly with mechanical max_endstop for homing. When I connect LSR they aren't efficient so I directly connect the gnd to the signal pin but it's the same.

Is it possible to use min_endstop and max_endstop with a delta printer an marlin firmware ?

If yes, what kind of mistake am I doing ?

thanks for answer

What is "LSR"?

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Generation 7 Electronics	Teacup Firmware	RepRap DIY

LSR = load sensitive resistor

Sorry, I did a mistake ; it is not LSR but FSR = force sensitive resistor

You cant connect a resitor to the end stop pins

Endstops are digital, they expect a 0 or 5v

A force sensitive resistor is a variable resitor you will get alsorts of voltages, the likely hood of it switching state just where you want it is very unlikely.

You need either need a board that converts the force sensitive resistor into a digital signal or to connect the force sensitive resistor to an analog input.

Eg [github.com]

I use FSR controller to get a digital output but the signal ( 0 or 1 ) don't stop the motors as I expect . I don't understand why.

what does m119 say?

while your squeezing a FSR and while your not...

To understand what happens, I change FSR for a switch. m119 says open when contact is opened and triggered when closed (the same as FSR).

I found in configuration_adv, mechanical settings, #define ENDSTOPS_ONLY_FOR_HOMING ; after commented, Z_MIN stops motors but not immediatly : they still turn few seconds at very low speed and, of course, in the wrong way

Have you an idea about this.