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WHY CAN'T MY PDA SCAN RED QR CODES?

 

1. Context

Currently, TC22/27 PDAs can only scan certain types of QR codes. For example, red QR codes are not detected correctly by these devices.

 

2. Explanation

PDAs use a red scanning light. This affects how colors are perceived by the scanner:

  • QR codes in black and white offer optimal contrast → they are read well
  • QR codes or barcodes in red appear almost white to the scanner → they become difficult, or even impossible, to read
  • Barcodes in orange also cause problems with the recommended PDAs

Indeed, scanners do not perceive colors the way the human eye does. For example:

  • The color red is perceived as very light (close to white)
  • The color green is perceived as darker

 

3. Best practices

Even though it is technically possible to generate codes in different colors, this increases the risk of reading errors.

 

✅ Solution:

We therefore strongly recommend using codes in black on a white background, to ensure reliable reading with PDAs.

 

 

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