Multiple sensor fusion in Arduino - Step-by-Step Execution

Concept Flow - Multiple sensor fusion

Read Sensor 1

↓

Read Sensor 2

↓

Read Sensor 3

↓

Combine Sensor Data

↓

Apply Fusion Algorithm

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Output Fused Result

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Repeat Loop

The program reads multiple sensors one by one, combines their data, applies a fusion algorithm, and outputs the final fused result repeatedly.

Execution Sample

Arduino

int sensor1 = analogRead(A0);
int sensor2 = analogRead(A1);
int sensor3 = analogRead(A2);
int fused = (sensor1 + sensor2 + sensor3) / 3;
Serial.println(fused);

Reads three analog sensors, averages their values, and prints the fused result.

Execution Table

Step	sensor1	sensor2	sensor3	fused	Action	Output
1	523				Read sensor1 from A0
2	523	487			Read sensor2 from A1
3	523	487	510		Read sensor3 from A2
4	523	487	510	506	Calculate average fused = (523+487+510)/3
5	523	487	510	506	Print fused value	506
6					Loop repeats for next readings

💡 Loop runs continuously; no exit unless device is powered off.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4	Final
sensor1	0	523	523	523	523	523
sensor2	0	0	487	487	487	487
sensor3	0	0	0	510	510	510
fused	0	0	0	0	506	506

Key Moments - 3 Insights

Why do we read each sensor separately before combining?

Each sensor value is read step-by-step (see execution_table rows 1-3) to get accurate individual readings before fusion.

How is the fused value calculated?

The fused value is the average of all sensor readings, calculated in step 4 by adding sensor1, sensor2, and sensor3, then dividing by 3.

Why does the loop repeat endlessly?

Arduino loops run continuously to keep updating sensor readings and fused output, as shown in step 6.

Visual Quiz - 3 Questions

Look at the execution_table, what is the value of sensor2 after Step 2?

A 510

B 523

C 487

D 0

💡 Hint

Check the 'sensor2' column in execution_table row for Step 2.

At which step is the fused value calculated?

A Step 4

B Step 2

C Step 5

D Step 3

💡 Hint

Look for the step where 'fused' variable gets a value in execution_table.

If sensor3 reads 600 instead of 510, what would be the new fused value at Step 4?

A 506

B 536

C 523

D 540

💡 Hint

Calculate average of sensor1=523, sensor2=487, sensor3=600 as shown in variable_tracker.

Concept Snapshot

Multiple sensor fusion in Arduino:
- Read each sensor separately using analogRead(pin)
- Combine readings (e.g., average) to fuse data
- Use fused value for better accuracy
- Repeat in loop for continuous updates
- Output fused result via Serial or other means

Full Transcript

This example shows how an Arduino program reads three sensors one by one, stores their values, then calculates the average as a simple fusion method. The fused value is printed to the serial monitor. The loop repeats to keep updating the fused data continuously. Variables sensor1, sensor2, and sensor3 hold individual readings, and fused holds the combined average. This step-by-step process helps beginners understand how multiple sensor data can be combined for better results.