Project: tank filler

The oxygen from electrolysis should go into a storage tank. It should get full, not burst. And whoever walks past the display should see how full it is. This week you collected all the building blocks for it.

The devices#

The rules#

• Target: 8000 kPa. The pump starts below 7500 kPa and stops at 8000 kPa (hysteresis).
• Output: sliding with lerp – empty tank 10 L/tick, just before the target 2 L/tick. Ratio = pressure / target.
• Emergency pressure: above 9000 kPa the emergency vent opens, the pump stands still, the warning flashes.
• Display: fill level pressure / target in Percent mode.
• Analyzer failure: pump off, vent closed, warning on, display 0.

Building blocks#

slt tmp press TARGET
and pumping pumping tmp
slt tmp press low            # low = TARGET - BAND
or pumping pumping tmp
sgt over press EMERGENCY
seqz tmp over
and pumping pumping tmp      # never pump on overpressure

The output comes from lerp MAXFLOW MINFLOW share. When the pump is not running you write Setting 0 – that way NaN never ends up in the pump:

select flow pumping flow 0

Milestones#

1. Empty tank: full output.
2. Almost full: the pump slows down.
3. Target reached: pump off, back on only below 7500 kPa.
4. Fill level in percent.
5. Overpressure: emergency vent open, pump off, warning.
6. Analyzer fails: everything into the safe state.