I've done quite a bit of googling and think I have this figured out, but I would like someone to double check me.
The Goal: Use an ATX power supply to provide 5v standby to power a Raspberry Pi which is connected (and powering) the Arduino / RAMPS stack. When ready to print, RPi will send G-Code to RAMPS to turn on the ATX power supply (via PS-ON pin) and provide the 12V to RAMPS for steppers, hotend, heated bed, etc... This is all designed to be used with OctoPrint for remote printing.
Wiring: Motherboard 24pin connector will be cut off the PSU. Yellow and Black wires will go to RAMPS terminal block to provide +12V and ground, respectively. Purple 5v standby and black wires will be spliced to a micro-USB to provide constant power/ground to Raspberry Pi (and thus to the Arduino/RAMPS stack). Green wire will be connected to the PS-ON pin on RAMPS.
Questions:
1) Will this work? 5v Standby should provide enough power to run RPi and Arduino/RAMPS, right?
2) Do I need to remove the D1 diode (pre-installed on my RAMPS board) to prevent damage to the electronics? I'm thinking I don't need to...
3) For the PS-ON signal to work, do I need to run a separate ground wire to the RAMPS board or will the grounds at the terminal blocks work?
3) Some tutorials for using ATX power supplies indicate a need to put a on the 5V rail in order to get the PSU to power on. Would the RPi on the 5V Standby work for this? Or does the load need to be on the 5V non-standby rail?
I apologize if none of this makes sense. I'm trying...
Thanks!
The Goal: Use an ATX power supply to provide 5v standby to power a Raspberry Pi which is connected (and powering) the Arduino / RAMPS stack. When ready to print, RPi will send G-Code to RAMPS to turn on the ATX power supply (via PS-ON pin) and provide the 12V to RAMPS for steppers, hotend, heated bed, etc... This is all designed to be used with OctoPrint for remote printing.
Wiring: Motherboard 24pin connector will be cut off the PSU. Yellow and Black wires will go to RAMPS terminal block to provide +12V and ground, respectively. Purple 5v standby and black wires will be spliced to a micro-USB to provide constant power/ground to Raspberry Pi (and thus to the Arduino/RAMPS stack). Green wire will be connected to the PS-ON pin on RAMPS.
Questions:
1) Will this work? 5v Standby should provide enough power to run RPi and Arduino/RAMPS, right?
2) Do I need to remove the D1 diode (pre-installed on my RAMPS board) to prevent damage to the electronics? I'm thinking I don't need to...
3) For the PS-ON signal to work, do I need to run a separate ground wire to the RAMPS board or will the grounds at the terminal blocks work?
3) Some tutorials for using ATX power supplies indicate a need to put a on the 5V rail in order to get the PSU to power on. Would the RPi on the 5V Standby work for this? Or does the load need to be on the 5V non-standby rail?
I apologize if none of this makes sense. I'm trying...
Thanks!