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Nevermore Stealthmax PCB 2 Instructions

Firmware Flashing

⚠️ Do not skip steps 1-6 if you sourced your PCB from anywhere but Isik's Tech. If you do and this setting wasn't pre-applied by the vendor you purchased from, you won't be able to reflash firmware after the initial flash.

  1. SSH into your Raspberry Pi.
  2. Download the STM32G0 legacy nBOOT_SEL setting file from its repo. sudo wget https://raw.githubusercontent.com/olikraus/stm32g031/main/enable_boot0/enable_boot0.hex
  3. Convert the hex file you downloaded to binary. objcopy --input-target=ihex --output-target=binary enable_boot0.hex enable_boot0.bin
  4. Connect your Nevermore Stealthmax PCB to your Raspberry Pi while holding down the BOOT button.
  5. Use lsusb to make sure you can see the device in DFU mode.
  6. Flash the binary file to enable legacy nBOOT_SEL mode. sudo dfu-util -a 0 -d 0483:df11 --dfuse-address 0x08000000:leave -D enable_boot0.bin
  7. Hold down the BOOT button on your PCB. While holding it down, press RESET, then release BOOT. Alternatively, you can unplug the PCB then plug it in again while holding down the BOOT button. Use lsusb again to make sure you can see the device in DFU mode
  8. Go to the Klipper directory. cd klipper
  9. Clean remaining files from previous build. make clean
  10. Choose the options for the build. make menuconfig Use the following options:
For USB Serial Communication 
[*] Enable extra low-level configuration options
    Micro-controller Architecture (STMicroelectronics STM32)  --->
    Processor model (STM32G0B1)  --->
    Bootloader offset (No bootloader)  --->
    Clock Reference (8 MHz crystal)  --->
    Communication interface (USB (on PA11/PA12))  --->
    USB ids  --->
()  GPIO pins to set at micro-controller startup
For CAN Bus Communication WITHOUT Katapult 
[*] Enable extra low-level configuration options
    Micro-controller Architecture (STMicroelectronics STM32)  --->
    Processor model (STM32G0B1)  --->
    Bootloader offset (No bootloader)  --->
    Clock Reference (8 MHz crystal)  --->
    Communication interface (CAN bus (on PB0/PB1))  --->
(1000000) CAN bus speed
()  GPIO pins to set at micro-controller startup
For CAN Bus Communication WITH Katapult 
[*] Enable extra low-level configuration options
    Micro-controller Architecture (STMicroelectronics STM32)  --->
    Processor model (STM32G0B1)  --->
    Bootloader offset (8KiB Bootloader)  --->
    Clock Reference (8 MHz crystal)  --->
    Communication interface (CAN bus (on PB0/PB1))  --->
(1000000) CAN bus speed
()  GPIO pins to set at micro-controller startup

Press Q then Y to save and quit the menu.

  1. Build. make
  2. Flash the firmware.
For USB Serial Communication
  1. Flash Klipper. make flash FLASH_DEVICE=0483:df11
  2. When finished, press the RESET button on your Nevermore Stealthmax PCB.
  3. Use ls /dev/serial/by-id/* to find the path starting with /dev/serial/by-id/usb-Klipper_stm32g0b1. This is the serial path of your Nevermore Stealthmax PCB.
For CAN Bus Communication WITHOUT Katapult
  1. Flash Klipper. make flash FLASH_DEVICE=0483:df11
  2. When finished, press the RESET button on your Nevermore Stealthmax PCB.
  3. Use ~/klippy-env/bin/python ~/klipper/scripts/canbus_query.py can0 to find the CAN bus UUID of your Nevermore Stealthmax PCB. (Make sure your CAN wires are connected.)
For CAN Bus Communication WITH Katapult
  1. Go home. cd ~
  2. Install Katapult. git clone https://github.com/Arksine/katapult
  3. Go to the Katapult directory. cd katapult
  4. Choose the options for the build. make menuconfig Use the following options:
  Micro-controller Architecture (STMicroelectronics STM32)  --->
  Processor model (STM32G0B1)  --->
  Build Katapult deployment application (Do not build)  --->
  Clock Reference (8 MHz crystal)  --->
  Communication interface (CAN bus (on PB0/PB1))  --->
  Application start offset (8KiB offset)  --->
(1000000) CAN bus speed
()  GPIO pins to set on bootloader entry
[*] Support bootloader entry on rapid double click of reset button
[ ] Enable bootloader entry on button (or gpio) state
[*] Enable Status LED
(PA13)  Status LED GPIO Pin
  1. Build. make
  2. Flash Katapult. sudo dfu-util -a 0 -d 0483:df11 --dfuse-address 0x08000000:leave -D out/canboot.bin
  3. When finished, press the RESET button on your Nevermore Stealthmax PCB.
  4. Use ~/klippy-env/bin/python ~/klipper/scripts/canbus_query.py can0 to find the CAN bus UUID of your Nevermore Stealthmax PCB. (Make sure your CAN wires are connected.)
  5. Flash Klipper. Replace <UUID> with your PCB's UUID. cd ~/katapult/scripts && python3 flashtool.py -i can0 -f ~/klipper/out/klipper.bin -u <uuid>
  6. When finished, press the RESET button on your Nevermore Stealthmax PCB.
  1. While you're SSH'd in, also download the python code needed for the SGP40 sensors from the Nevermore Max repo.
wget https://raw.githubusercontent.com/nevermore3d/Nevermore_Max/master/Software/Klipper/sgp40.py -P ~/klipper/klippy/extras
wget https://raw.githubusercontent.com/nevermore3d/Nevermore_Max/master/Software/Klipper/voc_algorithm.py -P ~/klipper/klippy/extras
systemctl restart klipper
  1. Run this command if you are using Mainsail and want the SGP40s displayed on the dashboard:
cd ~/mainsail/ && grep -l additionalSensors * -R | xargs sed -i 's+additionalSensors=\[+additionalSensors=\["sgp40",+g'

PCB Mount & Wiring

  1. Download and print the necessary files from this repo. You'll need to at least print the "Spacer" for your printer size. You can use the stock latch with the Rasperry Pi logo, or download the version from this repo with the Isik's Tech logo.
Filter Spacer Latch
Stealthmax Spacer Latch
Stealthmax S Spacer Latch
  1. Place the spacer over the screw holes of the electronics chamber of your filter. The top side of the mount (printing orientation), faces down. Align the outer screw holes with the holes on the spacer.
  2. Attach the heatsink to the PCB, behind the corner with the buck converters. Align its edges with the edges of the PCB. This is where it fits with the spacer: Heatsink
  3. Do the wiring. All internal connectors except peltier are JST-PH, peltier is MX3.0. CAN/VIN connector is XT30(2+2). Use the diagram below to wire your fan/sensors/leds/thermistor/peltier. Pinout

Klipper Config

  1. Download the Klipper config, and upload it to your printer.
  2. Open the file and edit according to your setup.
  3. Add [include SM2.cfg] in your printer.cfg.