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Im keeping the lid on this one for now. Besides Ive only shown proof of principle, not a working device. Ive also modified the key component a bit, as it is not designed for what I want. For example Im using it backwards. Theres also an inbuilt hysteresis that Im trying to get rid of.
I post more if I get it running more smoothly with the mods Ive made...
Woo hoo! I just got my electronic pressure control idea tested and it works.
Still a few things to sort out, but I turn a dial and the electronics changes the pressure. The first stop will be variable and adjustable pre-infusion (ie pressure and time) and adjustable brew pressure. Eventually I might look at pressure profiles as well.
The good thing is no fancy pumps are required. These are all off-the-shelf components and relatively cheap (sourced from coffeeparts. Thanks Pedro).
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