Different Pressure valves to be given for Paste Extrusion
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Hi to all,
I have a 3D printer which i want to make as a Paste Extrusion. I want to give different values of pressure from duet 0.6 board. And there is a Expansion Header pins how to enable that pins using g codes and where i have to store it so that I can increase or decrease the values of pressure . Please help me in this.
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Can you show Elaborately??
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What are you using to control the pressure? If it is a serve controlled valve or something else?
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Hi T3P3Tony,
I want to make as a voltage controller of pressure regulator for paste extrusion and i want to put one macro to increase the value of pressure by one ??
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Ok so what voltage range?
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its 0-5 voltage
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Ok so the Duet output is 3.3V and those pins are not on a DAC so you need some external circuitry to provide an analog voltage range.
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Hi T3P3Tony,
Thanks for response. then what is need of expansion header pins in duet 0.6 board?
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@allankisaiswaroop there are many tutorials out there on how to design a circuit to convert PWM to analog. These are some examples I found on Google:
http://www.instructables.com/id/Analog-Output-Convert-PWM-to-Voltage/
http://www.instructables.com/id/Arduino-RC-Circuit-PWM-to-analog-DC/Another option is to use something like this:
https://learn.adafruit.com/mcp4725-12-bit-dac-tutorial?view=all
Connected to the I2C pins 35 and 36 on the expansion header:
http://reprap.org/mediawiki/images/7/75/Duet0.6_back_Silkscreen.png
And then user the built in I2C commands in RepRapFirmware:
https://duet3d.dozuki.com/Wiki/Gcode#Section_M260_i2c_Send_Data -
Hi T3P3Tony,
Thanks a lot!! I want to know that they is a 5v and ground pins on expansion header pins. so we cannot enable and control voltage?
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No, those pins are fixed and not controlled. You need to either use an PWM signal as a start point for making an analog voltage or use an external DAC.
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Hi T3P3Tony,
Can I control the hot end fan like increasing and decreasing the values of speed of fan?
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@allankisaiswaroop yes you can, that works by using PWM which is OK for fan control on some fans because the fan smoothes the effect of an input voltage turning on and off many times per second. That means, for those types of fan, PWM pulse width is related to the effective voltage.
For a voltage controlled valve that would probably not be the case and you are likely to need to use a voltage level that is more stable.
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Hi T3P3Tony,
Thanks a lot!!. Can you help me in connections and where i have to connect ??
