Control of the temperature of the printing chamber
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I need to be able to control, using PWM, 2 solid state relays that control the resistance of the bed to 230 AC and the resistance of the printing camera this also use 230 AC.
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I think I need the extension board to have more PWM outputs but I don't know if this extension is only compatible with Duet 2 or also with Duet 2 Maestro
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On a Duet 2 or Duet 2 master board, how many PWM pins are available?
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Is it possible to reassign the pins in the firmware? For example, the output of the bed heater to me is not useful because I go to 230 AC, I need to assign a PWM of 5V DC to control the solid state relay.
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@Javier-M Regarding you point#3, you most certainly can connect an SSR to the bed heater output to control a 240V bed heater. IIRC, by default the PWM frequency for the bed heater output is 10Hz, mainly because it is "kinder" to SSRs.
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Most SSRs accept 3 to 32V control voltage input. Such SSRs can be connected to any of the following on the Duet:
- Any heater output (including the bed heater output)
- Any fan output (you would need to use RepRapFirmware 3 to be able to reassign a fan output as a heater output)
- On Duet WiFi or Duet Ethernet with no expansion board connected, any of the 5 heater outputs on the expansion connector. They are active low, so connect the SSR control terminals between the output and +3.3V.
- On the Duet Maestro, to the MOD pin of the Z probe connector, if you are not already using that pin (e.g. to control deployment of a BLTouch). Again, you would need to run RepRapFirmware 3 to be able to reassign this pin to be a heater.
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These two SSRs that you want to control, why two? Do they need to be independently controlled? Or are they different phases of electrical power? Or some other reason?
