Duet Wiring

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PWM MOSFET control

All power element which are controlled are connected to PWM controlled MOSFETs which drain current to the ground ('sinking' connections). These sinking lines are indicated by an arrow. PWM frequency varies depending the application and is user adjustable for controlled fans. MosFET may fail and stay permanently conductive, in this case the connected element will go full power with the only possibility to stop being to shutdown the power supply, which is only possible if the Power Supply could be stopped via the PS-on signal. See Safety page.

End stops connection

Duet board internal schematics for all end-stops

Signal shall never exceed 3.3V. Safety shall be provided in case of ground wiring fault. A solution is to add a safety diode. An optocoupler shall be the safest solution.

The signal line is connected to an on board LED (see schematic), so if endstops are electronic circuits, they shall be able to drain sufficient current through the LED to rise signal to high. This shall be taken into account if using a voltage divider (to limit the signal voltage).


Duet 0.8.5

Main wiring

Duet 0.8.5 wiring.jpg

All positive fan pins are connected to Vin.

The pinouts are on the back of the board (V 0.8.5), a KiCAD export shows the back below for reference (this is the view from the bottom of the board, so is mirrored):

Duet0.85 back silkscreen.png

There is more detail on the pinouts on the Duet pinout page.

BED and chamber heater SSR wiring

Chamber heater use E1 output and thermistor input. Duet 0.8.5 wiring2.jpg

5V controlled fan

Duet 0.8.5 wiring3.jpg

Buzzer

Duet buzzer.jpg

This schematic is also valid for Duet 0.6.

See RepRap Firmware macros#Activate output/buzzer

Duet 0.6

Beware of the Bed, heater and fan connector polarity, which is different from the 0.8.5 board

Main wiring

Duet 0.6 wiring.jpg

The back silkscreen on the Duet 0.6 contains further information on the pinouts, it is reproduced below Duet0.6 back Silkscreen.png

5V controlled fan

Duet 0.6 wiring3.jpg

Multiple steppers wiring

Two stepper wired in series.jpg
Warning! Steppers 6 pins plugs are not standardized and you shall check (with a multimeter) that for the board connector, each coil wire pair are on each side of the connector.

Identical steppers shall turn in same direction. To have them running in opposite direction, swap the wires of one coil. By example, you can swap yellow and green wires on the Z2 stepper connector.

To avoid confusion, it is better to use identically wired cables, with same colors.


See also