Carneiro wrote:Strada uses the gicleur indeed and I think if GS/3 or any other machine will be plumbed in the glicleur helps to limit the flow at the start, considering line pressure and possible high flow.
There's no question that you need a gicleur. If you leave it off you'll find that the machine makes some really awful noise when flushing and preinfusing, because the lack of a gicleur (effectively, an orifice of ~1.2mm, what the opening in the solenoid face of the TL30 tube is) means that there's enough of a pressure drop that the water in the heat exchanger feed to the boiler gets to flash boil in the tube—at least, I'm pretty sure that's what's going on from my armchair reasoning based on the sound and where it seems to emanate from. And it is awfully annoying, at least to me. In my experience you shouldn't go wider than 0.9mm on the orifice if you want to avoid this noise. I use somewhere in the 0.7-0.8mm range myself (sorry, I can't remember what it is exactly), as I feel this lets you have a soft infusion but allows you to get control of the pressure somewhat sooner, say by about 2-3 seconds.
So if what I'm seeing is correct, you can use the total flowmeter clicks to determine shot volume and click interval to control the flow rate. This is very cool! Are you using the stock LM flowmeter? I didn't realize it provided such fine detail.
Just to clear any misunderstandings: I'm only registering and showing the duration between clicks (the output is not adjusted in any way as it is)! The new pump/motor is not connected! But the output numbers are for real and pin 9 is hot This is nothing more than a more informative version of the most simple analog Potentiometer control when it comes to functionality.
Still have a few things to do before I'm able to hook up the new pump/motor - meanwhile
Imitating auto profiling ruled by flow. From "preinfusion value" to "max. value" (here 36-252) the flow meter click-interval is simply divided by 2!
Display: Info while idle or filling the steam boiler: Row 1, Column 1: state (idle/fill). For brew-activations longer than 10 sec. (if any): Row 2, Column 1: Last shot shot-time. Row 1, Column 2: Last shot average flow meter click-interval in milliseconds. Row 2, Column 2: Last shot max. flow meter click-interval in milliseconds. Info while brewing: Row 1, Column 1: current shot shot-time. Row 2, Column 1: Last shot shot-time (if any). Row 1, Column 2: current shot number of flow meter clicks. Row 2, Column 2: current shot duration of last click-interval in milliseconds. Row 1, Column 3: PWM-output for the motor ("preinfusion value" to "max. value" here 36-252). Row 2, Column 3: User compensation (using a rotary encoder).
Out of curiosity I've decided to have a look at the HB forums and I can't believe this thread is still going! craaaaazy espresso geeks!;) Good to see someone else messing around with the idea, especially with the new pump, should simplify things a lot.
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