Raspberry Pi - Web Server and API
You want to build a real-time dashboard on Raspberry Pi that updates sensor data every second and shows the average of last 5 readings. Which approach is best?
You want to build a real-time dashboard on Raspberry Pi that updates sensor data every second and shows the average of last 5 readings. Which approach is best?
hard📝 Scenario Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand real-time averaging requirement
To show average of last 5 readings updated every second, you must keep a rolling list of last 5 values.Step 2: Evaluate options for efficiency and accuracy
Store last 5 readings in a list, update every second, calculate average, then update dashboard correctly stores last 5 readings, updates average each second, and refreshes dashboard. Calculate average once at start, then display static value is static, C ignores averaging, D is inefficient and grows data indefinitely.Final Answer:
Store last 5 readings in a list, update every second, calculate average, then update dashboard -> Option DQuick Check:
Rolling average needs recent 5 values updated regularly [OK]
Quick Trick: Keep fixed-size list for rolling average updates [OK]
Common Mistakes:
MISTAKES- Calculating average only once
- Ignoring rolling window for average
- Storing unlimited data causing slowdowns
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