Any news about this ? I also thought about a similar solution but couldn t figure out where to put the sensor...and because anything with magnet field does not work well with heat, I didn t want to go further in this direction...
What about this: the hotend and the alu plate are connected to the same low electrical circuit.....for example the plate is (-) and the hotend is (+) and when they touch each other we cause a short circuit...like a switch, now the circuit is closed the electronic register it and proceed to the next point....
Just an idea....I am not an expert, so forgive it is no sence 8-)!
Update: talking about sence here is an example of what I mean:
CapSense: Capacitive Switch and CapacitiveSensor Arduino Library, Demo on Teensy 2.0
Update: Arduino Capacitive Sensing Library and Native Capacitive Sensors without additional Hardware
I don t know if it works metal against metal but if it doesnt, one could use a ceramic hotend....
Update:
Because I don t have a resistor, I made another test....and it works not as Capacitive Switch but as a Contact Switch...like the endstops. One pin to the alu bed and one pin to the hotend....The change can be read out on the screen. So if the Capacitive Switch does not work....the contact solution seems to work.
What about this: the hotend and the alu plate are connected to the same low electrical circuit.....for example the plate is (-) and the hotend is (+) and when they touch each other we cause a short circuit...like a switch, now the circuit is closed the electronic register it and proceed to the next point....
Just an idea....I am not an expert, so forgive it is no sence 8-)!
Update: talking about sence here is an example of what I mean:
CapSense: Capacitive Switch and CapacitiveSensor Arduino Library, Demo on Teensy 2.0
Update: Arduino Capacitive Sensing Library and Native Capacitive Sensors without additional Hardware
I don t know if it works metal against metal but if it doesnt, one could use a ceramic hotend....
Update:
Because I don t have a resistor, I made another test....and it works not as Capacitive Switch but as a Contact Switch...like the endstops. One pin to the alu bed and one pin to the hotend....The change can be read out on the screen. So if the Capacitive Switch does not work....the contact solution seems to work.