Safe Shutdown, Relay DIN Mount

thingiverse

SAFE SHUTDOWN CIRCUITAdd “Shutdown” Macro to Klipper printer.cfg[output_pin PS_ON]pin: PE11value: 1[gcode_macro POWER_OFF]gcode:SET_PIN PIN=PS_ON VALUE=0Add GPIO functions to RPI; sudo nano /boot/firmware/config.txt (or sudo nano /boot/config.txt)dtoverlay=gpio-poweroff,gpiopin=26,active_low=1dtoverlay=gpio-shutdown,gpio_pin=17,active_low=1,gpio_pull=up=gpio-shutdownSet timer relay to “F4” 25 seconds.OPERATION / LOGICFront panel momentary push button switch, provides 5vdc from Mains Relay to the Timer Relay which starts the supply of power for 25 seconds.RPI boots, and closes the Hi/Lo Relay which is connected to the Mains Relay, which latches the power “ON” while the RPI is booted. The 25 second timer allows for rebooting of the RPI by ssh.Second Hi/Lo Relay provides a safe shutdown of the RPI. PE11 provides 3.3v to the second relay and opens the GPIO 17 connection to ground. The “Power_OFF” macro allows the relay to close, RPI starts safe shutdown, 25 seconds later printer powers off.RELAY JUMPERSMains Relay - Jumper LoHi - Lo relays - Jumpers HiSOURCE OF PARTSDelay Timerhttps://www.amazon.com/gp/product/B07XT7XWTC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1Hi/Lo 5v relayhttps://www.amazon.com/gp/product/B07WQH63FB/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1Mains Control Relayhttps://www.amazon.com/gp/product/B077W1NVLM/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1Momentary 19mm Push Buttonhttps://www.amazon.com/gp/product/B0C36T7KPC/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1