PWM Expansion
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What is my best option for adding at least 4 or more pwm outputs to the Duet2 Wifi? At the moment I have a BLTouch, RPM to pb6, and most of the thermistors pins used on the expansion connecter. I have no need for any additional stepper motor drivers.
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have you used all 5 heater pins on the expansion port?
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I have not. I would prefer an expansion board of some type for cleaner wiring and also a lack of electrical component knowledge. If there is nothing reasonable I can use some external mosfets if someone will point me to the correct component and wiring diagrams. They will either be connected to fans or an ssr.
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the duex5 has the 5 pwm ports.
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I have looked the duex5 but can't justify the cost for only a few pwm outputs. It also has 5 unnecessary stepper driver.
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You can drive most SSRs directly from the heater control outputs on the expansion connector. Connect the SSR control input between +3.3V and the chosen heater control output.
Duet WiFi hardware designer and firmware engineer
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http://www.escher3d.com, https://miscsolutions.wordpress.com -
@3dML said in PWM Expansion:
I have looked the duex5 but can't justify the cost for only a few pwm outputs. It also has 5 unnecessary stepper driver.
then there is the duex2
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@dc42 said in PWM Expansion:
You can drive most SSRs directly from the heater control outputs on the expansion connector. Connect the SSR control input between +3.3V and the chosen heater control output.
Just to double check. The heater control output pins have a max voltage of +3.3V input? I have already burned up one processor from overvoltage.
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@Veti said in PWM Expansion:
@3dML said in PWM Expansion:
I have looked the duex5 but can't justify the cost for only a few pwm outputs. It also has 5 unnecessary stepper driver.then there is the duex2
I have previously I have reached out to a number of my suppliers and no one has the duex2 available in the US.
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@dc42
Will it work to connect the PWM wire from a 4 wire 12v fan to a heater control outputs on the expansion connector? -
@3dML said in PWM Expansion:
@dc42
Will it work to connect the PWM wire from a 4 wire 12v fan to a heater control outputs on the expansion connector?It will probably work, however if the black fan wire becomes disconnected from ground then it is likely to damage the microcontroller.
