Mini Diffrential IR sensor for Anet A8

thingiverse

I adopted it from DC42's design, published on https://github.com/dc42/OrmerodSensorBoard. The layout was done by Eagles on a single-side PCB. I modified the firmware in MiniLedSensor.cpp slightly. const unsigned int PortBNearLedBit = 1; const unsigned int PortBFarLedBit = 0; I swapped these two lines: const unsigned int PortBNearLedBit = 0; const unsigned int PortBFarLedBit = 1; The fuses of tiny25/45/85 are set to 0xE2, 0xDF, and 0xFF. I used avrdude with the following argument: -U lfuse:w:0xe2:m -U hfuse:w:0xdf:m -U efuse:w:0xff:m. The IR LED and phototransistor were taken from Opto Interrupter TLP832 and ITR8606, respectively. Both have been thoroughly tested. This modification is for Marlin firmware RC8 (Skynet3D 2.3.1). I made the following changes in configuration.h: #define Z_MIN_ENDSTOP_INVERTING false #define Z_MIN_PROBE_ENDSTOP_INVERTING false #define X_PROBE_OFFSET_FROM_EXTRUDER -28 #define Y_PROBE_OFFSET_FROM_EXTRUDER 0