Camera gimbal control in Drone Programming - Step-by-Step Execution

Concept Flow - Camera gimbal control

Receive control input

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Calculate desired angle

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Check angle limits

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Send command to gimbal motor

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Gimbal moves to angle

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Feedback sensor reads position

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Adjust if needed

↩Back to Receive control input

The gimbal control loop takes input, calculates angles, checks limits, commands motors, reads feedback, and adjusts continuously.

Execution Sample

Drone Programming

def control_gimbal(input_angle):
    max_angle = 90
    min_angle = -90
    if input_angle > max_angle:
        angle = max_angle
    elif input_angle < min_angle:
        angle = min_angle
    else:
        angle = input_angle
    send_to_motor(angle)
    return angle

This code limits the input angle to safe bounds and sends the command to the gimbal motor.

Execution Table

Step	input_angle	Condition	angle set to	Action
1	100	100 > 90 is True	90	send_to_motor(90)
2	-100	-100 < -90 is True	-90	send_to_motor(-90)
3	45	45 > 90 is False; 45 < -90 is False	45	send_to_motor(45)
4	90	90 > 90 is False; 90 < -90 is False	90	send_to_motor(90)
5	-90	-90 > 90 is False; -90 < -90 is False	-90	send_to_motor(-90)
6	0	0 > 90 is False; 0 < -90 is False	0	send_to_motor(0)

💡 All inputs processed; angles limited within -90 to 90 degrees and commands sent.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4	After Step 5	After Step 6
input_angle	N/A	100	-100	45	90	-90	0
angle	N/A	90	-90	45	90	-90	0

Key Moments - 3 Insights

Why do we limit the input angle before sending it to the motor?

Limiting the angle prevents the gimbal from moving beyond safe mechanical limits, as shown in steps 1 and 2 where input angles outside the range are set to max or min.

What happens if the input angle is exactly at the limit, like 90 or -90?

The angle is accepted as is because it is within the allowed range, as seen in steps 4 and 5 where input equals the limits and is sent directly.

Why do we check both greater than max and less than min conditions?

To ensure the angle stays within both upper and lower bounds, preventing unsafe commands, as demonstrated in the condition checks in the execution table.

Visual Quiz - 3 Questions

Look at the execution table, what angle is sent to the motor when input_angle is 100?

A 90

B 100

C -90

D 0

💡 Hint

Check Step 1 in the execution_table where input_angle is 100.

At which step does the input angle get sent without modification?

A Step 1

B Step 3

C Step 2

D Step 6

💡 Hint

Look for steps where condition is False for both limits and angle equals input_angle.

If the min_angle was changed to -45, what would happen at Step 2 with input_angle -100?

A angle would be set to -90

B angle would be set to -100

C angle would be set to -45

D angle would be set to 0

💡 Hint

Refer to variable_tracker and how angle is limited to min_angle.

Concept Snapshot

Camera gimbal control limits input angles to safe bounds.
Check if input_angle > max_angle, set to max_angle.
Check if input_angle < min_angle, set to min_angle.
Send limited angle to motor.
This prevents mechanical damage and ensures smooth control.

Full Transcript

This visual execution shows how camera gimbal control works by limiting input angles to safe mechanical bounds. The code receives an input angle, checks if it is above the maximum or below the minimum allowed angles, and adjusts it accordingly. Then it sends the safe angle command to the gimbal motor. The execution table traces different input angles and shows how the angle is set and sent. The variable tracker follows input_angle and angle values step by step. Key moments clarify why limiting angles is important and how boundary values are handled. The quiz tests understanding of angle limits and behavior at edges. This helps beginners see how gimbal control safely manages angles to protect hardware and achieve smooth camera movement.