Solder mask expansion in PCB Design - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the solder mask expansion value to 0.1 mm.

PCB Design

solder_mask_expansion = [1]

Drag options to blanks, or click blank then click option'

A0.1

B1.0

C0.01

D10

Attempts:

3 left

💡 Hint

Common Mistakes

Using too large a value like 10 mm

Using zero which disables expansion

The solder mask expansion is typically set in millimeters. Here, 0.1 mm is a common value to ensure proper coverage.

2fill in blank

medium

Complete the code to calculate the adjusted pad size by adding solder mask expansion.

PCB Design

adjusted_pad_size = pad_size [1] solder_mask_expansion

Drag options to blanks, or click blank then click option'

A-

B/

C*

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction which reduces size

Using multiplication or division which changes scale incorrectly

To get the adjusted pad size, you add the solder mask expansion to the original pad size.

3fill in blank

hard

Fix the error in the code to correctly apply solder mask expansion only if the expansion is positive.

PCB Design

if solder_mask_expansion [1] 0:
    apply_expansion()

Drag options to blanks, or click blank then click option'

A<=

B>

C==

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' which includes zero and negatives

Using '==' which only checks zero

The expansion should be applied only if the solder mask expansion value is greater than zero.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps pad names to their adjusted sizes only if expansion is positive.

PCB Design

adjusted_sizes = {pad: size [1] solder_mask_expansion for pad, size in pads.items() if solder_mask_expansion [2] 0}

Drag options to blanks, or click blank then click option'

A+

B-

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-' which subtracts expansion

Using '<' which checks for negative values

The dictionary comprehension adds the expansion to each pad size only if the expansion is greater than zero.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps pad names in uppercase to their adjusted sizes only if expansion is positive and size is above 0.5 mm.

PCB Design

adjusted_sizes = [1]: size [2] solder_mask_expansion for pad, size in pads.items() if solder_mask_expansion [3] 0 and size > 0.5

Drag options to blanks, or click blank then click option'

Apad.upper()

B+

C>

Dpad.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'pad.lower()' instead of uppercase

Using '-' instead of '+' for addition

Using '<' instead of '>' for positive check

This comprehension converts pad names to uppercase, adds expansion to sizes, and filters pads with positive expansion and size greater than 0.5 mm.