Duet pinout
The following table is for the 50 pin expansion header found on the Duet board and used to interface with a Duex4 board. The table columns are
- Pin -- the expansion header pin number,
- Duet Label -- the label for the pin shown on the underside of the Duet board,
- Due Pin -- the Arduino Due pin name; in some cases the pin does not have an Arduino Due name and an extended "X" name is shown instead for use with the SamNonDue library, and
- RepRapFirmware Usage -- the usage put to the pin by the dc42 branch of the RepRapFirmware
The dir[], enable[], and step[] values in the usage descriptions refer to the stepper driver direction, enable, and step pin assignment arrays. Similarly, the heat[] and therm[] values correspond to the heater power and thermistor sensor pin assignment and ADC channel arrays.
Note that heat[6] position in the firmware is presently unassigned and instead used by Fan1. The pin is intended to be pin X17.
| Duet | Due | Duet | Due | |||||
|---|---|---|---|---|---|---|---|---|
| Pin | Label | Pin | RepRapFirmware Usage | Pin | Label | Pin | RepRapFirmware Usage | |
| 2 | GND | 1 | +5V | |||||
| 4 | RST | 3 | +3.3V | |||||
| 6 | TWCK0 | D71 | Digipot | 5 | TWD0 | D70 | Digipot | |
| 8 | UTXD | D1 | Serial1 TX / PanelDue | 7 | URXD | D0 | Serial1 RX / PanelDue | |
| 10 | PA14 | D23 | FAN RPM | 9 | PD9 | D30/X9 | endstop[8] / E1_STOP | |
| 12 | RXD1 | D17 | MAX31855-1 CS (proposed) | 11 | TXD1 | D16 | MAX31855-0 CS (proposed) | |
| 14 | RXD0 | D19 | MAX31855-3 CS (proposed) | 13 | TXD0 | D18 | MAX31855-2 CS (proposed) | |
| 16 | PC30 | D72/X11 | dir[8] / E1_DIR | 15 | PC29 | X10 | step[8] / E1_STEP | |
| 18 | PC4 | X17 | FAN1 / E1_PWM | 17 | PC28 | X13 | enable[8] / E1_EN | |
| 20 | PB14 | D53 | dir[5] / E2_DIR | 19 | PC7 | D39 | step[5] / E2_STEP | |
| 22 | PC22 | D8 | heat[4] / E3_PWM | 21 | PC23 | D7 | heat[3] / E2_PWM | |
| 24 | PC20 | X8 | enable[5] / E2_EN | 23 | PC21 | D9 | heat[5] / E4_PWM | |
| 26 | NPCS1 | D4 | dir[2] | 25 | PB24 | X16 | ||
| 28 | SPCK | 27 | NPCS0 | D77 | ||||
| 30 | MISO | 29 | MOSI | |||||
| 32 | PB16 | D67 | 31 | PB23 | X15 | |||
| 34 | AD0 | D61/A7 | therm[3] / E2_THERM | 33 | AD13 | D65/A11 | therm[6] / E1_THERM | |
| 36 | TWCK1 | D21 | 35 | TWD1 | D20 | |||
| 38 | AD11 | D63/A9 | therm[5] / E4_THERM | 37 | AD10 | D62/A8 | therm[4] / E3_THERM | |
| 40 | PB22 | X14 | 39 | VSSA | ||||
| 42 | PC11 | X4 | step[6] / E3_STEP | 41 | AD14 | D52 | Z_PROBE_MOD_PIN | |
| 44 | PC13 | D50 | enable[6] / E3_EN | 43 | PC12 | D51 | dir[6] / E3_DIR | |
| 46 | PC15 | D48 | dir[7] / E4_DIR | 45 | PC14 | D49 | step[7] / E4_STEP | |
| 48 | PC17 | D46 | endstop[5] / E2_STOP | 47 | PC16 | D47 | enable[7] / E4_EN | |
| 50 | PC19 | D44 | endstop[7] / E4_STOP | 49 | PC18 | D45 | endstop[6] / E3_STOP |
Note that Duex4 board makes the following associations
- E2 -- dir,enable,step[5] heat[3] therm[3]
- E3 -- dir,enable,step[6] heat[4] therm[4]
- E4 -- dir,enable,step[7] heat[5] therm[5]
- E1 -- dir,enable,step[8] heat[6] therm[6] BUT heat[6] is presently not assigned in the dc42 branch of the RepRapFirmware. The pin X17 is instead used for Fan1.
