Automatic turn-off relay timer, box and EAGLE files
thingiverse
Automatic Turn-off Relay MCU Attiny13 (low fuse 0x7A, high fuse 0xFF) is connected to GND, +5V and PS-ON to ramps. Firmware automatically turns off relay when PS-ON pin is HIGH at start-up. The MCU then reads the trimmer, subtracting time needed to turn off printer from 5-35 minutes. I use RaspberryPI for powering RAMPS, so I don't need a button to connect contacts from the relay. If you don't have a separate source for RAMPS, you must use the push button to bypass the relay for few seconds. Upload the HEX file to Attiny13 with USBasp or other programmer. !!! Must start gcode file with M80 and end it with M81 !!! !!! Be extremely cautious when connecting high voltage to power supply! It's at your own risk!!!
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