In this video I was supposed to upgrade my Creality CR-10 3D printer with an auto-leveling sensor but I failed to do that and I will explain why in a few minutes.
The upgrade would involve showing you how to connect the sensor to the motherboard and then flashing the open source marlin firmware to add the auto-leveling features as well as other improvements.
The thing is, nobody tells you that you can’t have the SD card option, the graphical lcd option and the auto bed leveling option active in marlin firmware at the same time when compiling for the stock CR10 board with the atmega1284 which only has 128K of flash memory. The resulting program will simply not fit on that 128K of memory.
Here are links to the stuff mentioned in the video:
- LJ18A3-8-Z/BX 8mm NPN NO Inductive Sensor
- LJC18A3-H-Z/BX 1-10mm NPN NO Capacitive Sensor
- SN04-N 4mm NPN NO Sensor
- PL-05N 5mm Inductive NPN NO Sensor
- CR-10S Atmega2560 Motherboard (make sure to check it’s the one with the Atmega2560)
- Marlin firmware website
- Optocoupler schematic
Here is how to connect the sensor to your 3d printer using an optocoupler