Automatic turn-off relay timer, box and EAGLE files
cults3d
► Automatic turn-off relay ◄ MCU Attiny13 (low fuse 0x7A, high fuse 0xFF) is connected to GND, +5V and PS-ON to ramps. Firmware - if PS-ON pin is LOW at start your printer, then relay is ON. When the PS-ON pin goes to HIGH, the MCU reads the trimmer and subtracts the time to turn off the printer 5-35 minutes. I use RaspberyPI for powering RAMPS, so I don't need a button to connect contacts from the relay. When you don't have a separate source for RAMPS, you must have to use the push button to bypass the relay on few seconds. Upload the HEX file to Attiny13 with USBasp or other programmer. !!! Must have M80 at first line of gcode and M81 at last line of gcode file !!! !!! Be careful when connecting high voltage to the power supply! It's at your own risk !!!
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