BTT Rodent and FluidNC

Software / Firmware Jackpot Board / FluidNC
1

I am having hard time to configure a YAML file for my laser engraver running FluidNC on a BTT Rodent. I have managed to get everything working except the Y and A motors work together. Could someone kindly share with me the YAML file of a 3-axis CNC? Actually, I only need the section related to the Y axis so I can try to understand what is wrong in my configuration. My Y axis YAML is this:
steps_per_mm: 800.000
max_rate_mm_per_min: 5000.000
acceleration_mm_per_sec2: 100.000
max_travel_mm: 430.000
soft_limits: false
homing:
cycle: 1
positive_direction: true
#positive_direction: false
mpos_mm: 150.000
feed_mm_per_min: 100.000
seek_mm_per_min: 200.000
settle_ms: 500
seek_scaler: 1.100
feed_scaler: 1.100

motor0:
  limit_neg_pin: NO_PIN
  limit_pos_pin: gpio.34:low
  limit_all_pin: NO_PIN
  hard_limits: true
  pulloff_mm: 1.000
  tmc_5160:
    step_pin: I2SO.5
    direction_pin: I2SO.4:low
    disable_pin: I2SO.7
    cs_pin: NO_PIN
    spi_index: 2
    r_sense_ohms: 0.075
    run_amps: 0.5
    hold_amps: 0.5
    microsteps: 8
    toff_disable: 0
    toff_stealthchop: 5
    use_enable: false
    run_mode: CoolStep
    homing_mode: CoolStep
    stallguard: 16
    stallguard_debug: false
    toff_coolstep: 3
    tpfd: 4
    
motor1:
  limit_neg_pin: NO_PIN
  limit_pos_pin: gpio.32:low
  limit_all_pin: NO_PIN
  hard_limits: true
  pulloff_mm: 1.000
  tmc_5160:
    step_pin: I2SO.13
    direction_pin: I2SO.12
    disable_pin: I2SO.15
    cs_pin: NO_PIN
    spi_index: 4
    r_sense_ohms: 0.075
    run_amps: 0.5
    hold_amps: 0.5
    microsteps: 8
    toff_disable: 0
    toff_stealthchop: 5
    use_enable: false
    run_mode: CoolStep
    homing_mode: CoolStep
    stallguard: 16
    stallguard_debug: false
    toff_coolstep: 3
    tpfd: 4
2

Hello, Angelo. Welcome to the V1 community forums.

It would probably be better if you posted your full config.yaml file, using the preformatted text capability of the forum (it’s the icon that looks like this image on the editor toolbar.)

I’m confused why you are looking for a 3 axis config with an A axis.

Can you post pictures of your machine setup?

Do you have no Laser Z height control (or manual Z), and are using a rotary axis?

We can’t really help suggest a configuration unless we understand fullly how your machine is built and how you use it.

We’re also not experts here on the BTT rodent, which is very much not a V1 Jackpot board nor a Bart Dring controller design. It does run FluidNC and Bart seems to think it’s a respectable board.

We’ll do what we can to help you, but might be limited by your board not being one of the V1 boards.

3

``My CNC is partially disassembled. It used to work with Arduino and I’m trying to make this upgrade with Rodent. Sorry if it got confusing, but it’s not axis A, it’s motor A. That is, Y axis with 2 motors. Motor0 (Y) and motor1 (A which the board designates as E). At the moment I’m just testing the motor activation, that’s why the mess of the CNC. I just made a change in run_amps from 0.5 to 1.5, but I haven’t tested it yet.`

foto1
foto11600×1200 229 KB

board: BTT Rodent V1.0
name: BC103_V2
meta: (16.07.2025) by MJ

kinematics:
  Cartesian:

# stepping:
#   engine: RMT
#   idle_ms: 250
#   dir_delay_us: 1
#   pulse_us: 2
#   disable_delay_us: 0
stepping:
  engine: I2S_STREAM
  idle_ms: 255
  pulse_us: 4
  dir_delay_us: 1
  disable_delay_us: 0

axes:
  shared_stepper_disable_pin: NO_PIN
  x:
    steps_per_mm: 800.000
    max_rate_mm_per_min: 5000.000
    acceleration_mm_per_sec2: 100.000
    max_travel_mm: 300.000
    soft_limits: false
    homing:
      cycle: 1
      positive_direction: true
      mpos_mm: 150.000
      feed_mm_per_min: 100.000
      seek_mm_per_min: 200.000
      settle_ms: 500
      seek_scaler: 1.100
      feed_scaler: 1.100

    motor0:
      limit_neg_pin: NO_PIN
      limit_pos_pin: gpio.35:low
      limit_all_pin: NO_PIN
      hard_limits: true
      pulloff_mm: 1.000
      tmc_5160:
        step_pin: I2SO.2
        direction_pin: I2SO.1
        disable_pin: I2SO.0
        cs_pin: gpio.5
        spi_index: 1
        r_sense_ohms: 0.075
        run_amps: 1.5
        hold_amps: 0.5
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: CoolStep
        homing_mode: CoolStep
        stallguard: 16
        stallguard_debug: false
        toff_coolstep: 3
        tpfd: 4

  y:
    steps_per_mm: 800.000
    max_rate_mm_per_min: 5000.000
    acceleration_mm_per_sec2: 100.000
    max_travel_mm: 430.000
    soft_limits: false
    homing:
      cycle: 1
      positive_direction: true
      #positive_direction: false
      mpos_mm: 150.000
      feed_mm_per_min: 100.000
      seek_mm_per_min: 200.000
      settle_ms: 500
      seek_scaler: 1.100
      feed_scaler: 1.100

    motor0:
      limit_neg_pin: NO_PIN
      limit_pos_pin: gpio.34:low
      limit_all_pin: NO_PIN
      hard_limits: true
      pulloff_mm: 1.000
      tmc_5160:
        step_pin: I2SO.5
        direction_pin: I2SO.4:low
        disable_pin: I2SO.7
        cs_pin: NO_PIN
        spi_index: 2
        r_sense_ohms: 0.075
        #run_amps: 0.5 ALTEREI PARA 1.5
        run_amps: 1.5
        hold_amps: 0.5 
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: CoolStep
        homing_mode: CoolStep
        stallguard: 16
        stallguard_debug: false
        toff_coolstep: 3
        tpfd: 4
        
    motor1:
      limit_neg_pin: NO_PIN
      limit_pos_pin: gpio.32:low
      limit_all_pin: NO_PIN
      hard_limits: true
      pulloff_mm: 1.000
      tmc_5160:
        step_pin: I2SO.13
        direction_pin: I2SO.12
        disable_pin: I2SO.15
        cs_pin: NO_PIN
        spi_index: 4
        r_sense_ohms: 0.075
        #run_amps: 0.5 ALTEREI PARA 1.5
        run_amps: 1.5
        hold_amps: 0.5 
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: CoolStep
        homing_mode: CoolStep
        stallguard: 16
        stallguard_debug: false
        toff_coolstep: 3
        tpfd: 4

  z:
    steps_per_mm: 800.000
    max_rate_mm_per_min: 5000.000
    acceleration_mm_per_sec2: 100.000
    max_travel_mm: 50.000
    soft_limits: false
    homing:
      cycle: 1
      positive_direction: true
      mpos_mm: 150.000
      feed_mm_per_min: 100.000
      seek_mm_per_min: 800.000
      settle_ms: 500
      seek_scaler: 1.100
      feed_scaler: 1.100

    motor0:
      limit_neg_pin: NO_PIN
      limit_pos_pin: gpio.33:low
      limit_all_pin: NO_PIN
      hard_limits: true
      pulloff_mm: 1.000
      tmc_5160:
        step_pin: I2SO.10
        direction_pin: I2SO.9
        disable_pin: I2SO.8
        cs_pin: NO_PIN
        spi_index: 3
        r_sense_ohms: 0.075
        run_amps: 1.500
        hold_amps: 0.500
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: CoolStep
        homing_mode: CoolStep
        stallguard: 16
        stallguard_debug: false
        toff_coolstep: 3
        tpfd: 4

  a:
    # E0
    steps_per_mm: 800.000
    max_rate_mm_per_min: 5000.000
    acceleration_mm_per_sec2: 100.000
    max_travel_mm: 430.000
    soft_limits: false
    homing:
      cycle: 1
      positive_direction: true
      mpos_mm: 150.000
      feed_mm_per_min: 100.000
      seek_mm_per_min: 200.000
      settle_ms: 500
      seek_scaler: 1.100
      feed_scaler: 1.100

    motor0:
      limit_neg_pin: NO_PIN
      #limit_pos_pin: gpio.32:low
      limit_all_pin: NO_PIN
      hard_limits: true
      pulloff_mm: 1.000
      tmc_5160:
        #step_pin: I2SO.13
        #direction_pin: I2SO.12
        #disable_pin: I2SO.15
        cs_pin: NO_PIN
        spi_index: 4
        r_sense_ohms: 0.075
        run_amps: 0.5
        hold_amps: 0.5
        microsteps: 8
        toff_disable: 0
        toff_stealthchop: 5
        use_enable: false
        run_mode: CoolStep
        homing_mode: CoolStep
        stallguard: 16
        stallguard_debug: false
        toff_coolstep: 3
        tpfd: 4

i2so:
  bck_pin: gpio.22
  data_pin: gpio.21
  ws_pin: gpio.17

spi:
  miso_pin: gpio.19
  mosi_pin: gpio.23
  sck_pin: gpio.18

sdcard:
  cs_pin: gpio.0
  card_detect_pin: NO_PIN
  frequency_hz: 8000000
# I2SO.3

# coolant:
#   flood_pin: gpio.2:low
#   mist_pin:  gpio.3:low
# gpio.4 # HB MOS

# probe:
#   pin: gpio.5:low:pu
#   toolsetter_pin: gpio.14:low

# Begin Huanyang
uart1:
  txd_pin: gpio.15
  rxd_pin: gpio.16
  rts_pin: gpio.14
  baud: 9600
  mode: 8N1

Huanyang:
  uart_num: 1
  modbus_id: 1
  tool_num: 0
  speed_map: 0=0% 0=25% 6000=25% 24000=100%
  off_on_alarm: false

# PWM:
#   pwm_hz: 5000
#   output_pin: gpio.13
#   enable_pin: gpio.25
#   direction_pin: gpio.15
#   disable_with_s0: false
#   s0_with_disable: false
#   spinup_ms: 0
#   spindown_ms: 0
#   tool_num: 0
#   speed_map: 0=0% 10000=100%
#   off_on_alarm: false

i2c0:
   sda_pin: gpio.27
   scl_pin: gpio.26

oled:
   i2c_num: 0
   i2c_address: 60
   width: 128
   height: 64
   radio_delay_ms: 1000

status_outputs:
  report_interval_ms: 500
  idle_pin: I2SO.11:low
  run_pin: I2SO.14:low
  alarm_pin: I2SO.3:low
# hold_pin: gpio.16
1 Like
4

Let’s confirm some things.
Looks like your machine axis setup is XYYZ.

Which motors are connected to which connectors on the rodent?
Rodent appears to label these as XYZE. I don’t see an A on the BTT users manual:

image
image1086×1448 170 KB

Also, what endstops are on your machine, which motor and axis are they associated with, and where are they plugged into your controller?

How is your laser connected to the rodent?

1 Like
5

Sorry for the delay. I was traveling.
But let’s go. Yes, my machine axis setup is XYYZ. I called it axis A, but it is actually the axis E indicated in Rodent.
The endstops are connected to X-max (X motor), Y-max (Y motor), Z-max (Z motor), E0-max (Y motor).
I haven’t connected the Laser yet.

1 Like
6

HI Maker Jim, I gave up. I really appreciate your patience and willingness to help me, but this board has exhausted my patience. I’ve already disassembled it and put it away for a future, maybe.
I will prepare to buy a V1 Jackpot board.
Thank you very much.

1 Like
7

The forum will be ready to help if you need anything after receiving the jackpot board.

1 Like
8

thank you very much

1 Like
9

Interesting build!