Read and generate QR codes for products, URLs, vCards, phone numbers, calendar events, and more with this fun and useful app.

Odd display technologies are always interesting to see, as are unusual encoding techniques such as binary, ternary or higher-radix number systems.

Unlike our everyday counting system that uses tens, binary uses just two numbers, 0 and 1. Learn more with BBC Bitesize. Suitable for KS3 students.