Solenoid Probe

This remix uses a solenoid to drive the plunger. Detection is based on a photo-interrupter.

ATTiny13A controls the H-bridge which drives the solenoid.

Plunger displacement is 7mm. It triggers at 4mm, and retracts 3mm above nozzle, and is quite accurate.

Additional details:
The part is not published because it is very specific to my printer and mounting location, and would be of little use to others. The details are here if someone wants to replicate it for their printer.

**Electronics:**
The circuit diagram and ATTiny13 code is added to the files. Originally I intended to use servo signals, but in the heated chamber, the tiny13 internal RC clock drifted significantly, making accurate angle measurements unreliable. Its better to use an external Xtal oscillator based part like Tiny2313 for that application. The current code, just expects the High/Low signal and stows/deploys the probe. Maximum temperature this setup can be used is 80 deg C - which is the rated temperature