RaspberryLatte

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Flow rate sensor is slow and not accurate at low flows

1

It could be replaced with something like [this](https://www.alibaba.com/product-detail/EPT-small-size-output-water-flow_1600425267625.html?spm=a2700.galleryofferlist.normal_offer.d_title.2d153290taghZW). However, this will require retuning everything, but this is probably okay since the flow control never worked great anyway.

hallboyone

CRITICAL - Occasional erratic behavior in boiler

3

I have observed occasional erratic behavior in the boiler. I'm not sure if it's software (sensor driver, PID implementation, etc) or hardware (sensor failure). Best guess is an overflow error...

hallboyone

A steam boost feature should be added. When in steam mode, activating it would cause the pump to slowly run, adding more water to the boiler. The water's cooling effect...

hallboyone

5V flow rate not supported by control board without modifications

1

The control board was designed for 3.3V flow sensors. Turns out, they are almost exclusively 5V. To get around this with the current design, a jumper has to be soldered...

hallboyone

Ground plane around AC traces

1

There is not enough clearance around the traces caring AC loads on the PCB. The ground plan should be carved out in this area.

hallboyone

Flow rate starts at non-zero value when machine is switched on.

1

Probably something is not being reset correctly.

hallboyone

There are occasional spikes (positive or negative) in the temperature. I have only noticed them for a single time step, but they should be addressed.

hallboyone