Scanning Barcodes and QR Codes
· Barcode is wide adopted in our daily lives, they are found on various products.
· QR Codes are used for data exchange or cashless shopping.
Scanning Barcodes and QR Codes
Loading Extensions
Search "KOI" in the search bar.
Or copy and paste the following link to the search bar.
https://github.com/KittenBot/pxt-koi
Blocks for reading codes:
Sample Program
Program Flow
Download the program to the Micro:bit.
Point the KOI at a Barcode and press A on the Microbit, the content of the Barcode will be shown on KOI’s screen.
Point the KOI at a QRCode and press B on the Microbit, the content of the QRCode will be shown on KOI’s screen.
Advanced Program
There may not be enough time to read the contents if we show it on KOI, to improve readability, we can connect an OLED screen.
Connecting an OLED
Connect an OLED panel to the I2C port of your Robotbit/Armourbit.
Sample Program
Sample Code
1. Scanning Barcodes and QR Codes (Extension0.5.7)
2. Scanning Barcodes and QR Codes /w OLED (Extension0.5.7)
Extension Version and Updates
There may be updates to extensions periodically, please refer to the following link to update/downgrade your extension.
FAQ
1: There is no reaction after pressing the buttons on the Micro:bit.
· A: This is because KOI has a longer boot time than Micro:bit. When the power is turned on, Micro:bit has already ran the code for KOI initialization before KOI is ready.
· Solution: Reset your Micro:bit after KOI has been turned on. (The trick is to let KOI power on completely before initialization.)
2: Does KOI work with 3V input?
· A: No, KOI only works with 5V.
3: KOI fails to recognize my Barcodes/QR Codes.
· A: Make sure the width of the code is at least 3.5cm and the code is entirely within the camera’s view.
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