What you learn today
- Monitor Health
- Narrow down causes
- Warning
The Harvie's face is sad, Health is dropping. But why? A chip that only reports “sick” sends you searching. One that names the cause sends you straight to the right place.
What the values say
| Value | Source | means |
|---|---|---|
Health | slot 0 of the tray | 1 undamaged, below that damage, −1 without a plant |
Efficiency | slot 0 of the tray | how fast it grows right now |
Mode | Harvie | 1 happy, 2 unhappy, 3 dead |
In the game code Efficiency is the product of five partial values: breathing, light, temperature, water and pressure. If one of them drops to 0, growth stops. The Harvie shows an unhappy face when the plant gets harmful gas, is thirsty or cannot heal.
Narrowing down causes
A gas sensor in the room and the hydroponics device are enough for the four most common causes:
| Code | Cause | Measurement |
|---|---|---|
| 1 | harmful gas | Pressure · RatioPollutant above 1 kPa |
| 2 | temperature | outside 20 to 30 °C |
| 3 | water | TotalMoles of the tray almost 0 |
| 4 | CO₂ | below 1 % |
The 1 kPa come from the game data: from this partial pressure on, pollutant counts as harmful gas for the plant. Partial pressure is total pressure times share.
Priority
If two causes apply, the most urgent one should be shown. According to the game data a plant takes damage after 300 s of harmful gas, frost or heat, after 1800 s of thirst, and only after 3600 s without breathing gas. Hence the order of the codes.
The trick for priority: check from least to most important and overwrite with select each time. Whatever matches last wins:
move code 0
slt tmp co2 CO2_MIN
select code tmp 4 code # least important first
slt tmp water WATER_MIN
select code tmp 3 code
slt tmp temp T_MIN
select code tmp 2 code # overwrites 3 and 4If the sensor is missing, all comparisons are 0 – code 0 would then mean “all fine”. That is why there is a separate check with code 9 at the very end. A trick saves lines here: add tmp temp water is NaN as soon as one of the two is NaN.
The times are base values. Genes can make a plant more resistant, but the order of the dangers mostly stays the same.
Exercise
Task
Build the plant diagnosis for the hydroponics device “Beet” and the gas sensor “Gewaechshaus”:
- display “Ursache”: 1 harmful gas (partial pressure of pollutant above 1 kPa), 2 temperature outside 20–30 °C, 3
TotalMolesof the tray below 1, 4 CO₂ below 1 %, otherwise 0 – with several, the smallest number - 9 if the sensor or the tray is missing
- light “Pflanze” on when a code is active or the
Healthof an existing plant is below 0.8
Hints
Hint 1
Check from code 4 to code 1 and use select code tmp N code each time – the most important wins.
Hint 2
Partial pressure: Pressure times RatioPollutant.
Hint 3
Health −1 means no plant: sgez value value masks it before you combine with and.
Quiz
4 questions. You pass from 60 % – the server does the grading.
Complete the day
- Passed the simulator exercise
- Passed the quiz with at least 60 %
Without an account progress is saved in this browser only.
Report a mistake in this lesson
Please sign in to report. Sign in