How to connect a Touch Plate to TinyG

From the original Synthetos forum (2011–2025)

Started by snooperace on in TinyG Support. 1 reply, last activity Sep 28, 2015.

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Hi All
I am trying to setup a touch plate in Chilipeppr and tinyg. I have the Z min and Max set to NC and Z min connected to the touch plate. Now my logic fails me. in Tiny G all min and max switches need to be set to the same NC or NO.

For the Touch Plate to work do I need to set all axis switches to NO and if so when the touch plate contact the sensor will this cause Tinyg to create an alarm and stop requiring a reset.

So what I need to know is how is this setup to work with Tinyg and Chilipeppr

Staff #

Can we assume you are running very recent FW, such as 440.20?

What you describe is "old" behavior.
A change was made such that when a probe command,e.g. G38.2 Z0 , is sent,FW logic changes to looking for a change of state on Zmin switch, rather than a high or low. The other 5 limit/home switches remain level only, not change of state.

So all switches can be set NC (recommended) or NO with the $ST parameter, when probing the probe will trigger when the Zmin switch changes state.

Here is a descriptive reference comment

https://github.com/synthetos/TinyG/wiki/TinyG-Configuration-for-Firmware-Version-0.97#st---switch-type

See also

https://github.com/synthetos/TinyG/wiki/ChiliPeppr-PCB-Auto-Level

for how ChiliPeppr uses this

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