Code Scanner

Import KOI 2 Library

from future import *
from koi2 import KOI2

Serial Initialization

koi = KOI2(tx, rx)

Initializes the serial connection to KOI.

Parameters:

tx: TX Pin, use P2 for Robotbit EDU

rx: RX Pin, use P12 for Robotbit EDU

Select Code Scan Mode

koi.setModel(256)

Sets the KOI mode to Code Scanning.

Select Code Type

koi.scanCodeSwitchType(type)

Select code type.

Parameters:

type: 0 for QR Code, 1 for Barcode

Get Code Attributes

koi.xywh[0]

Returns data for the detected code.

Parameters:

data: The type of data to return.

data	Meaning
0	X coordinates
1	Y coordinates
2	Width of code
3	Height of code

Get Code Value

koi.strVal

Returns the value of the code scanned.

Sample Program: Code Scanner

from future import *
from koi2 import KOI2



koi = KOI2('P2', 'P12')
koi.setModel(256)
sleep(15)
koi.direction(2)
koi.mirror(0)
screen.sync = 0
while True:
  koi.read_from_uart()
  if sensor.btnValue('a'):
    koi.scanCodeSwitchType(0)
  if sensor.btnValue('b'):
    koi.scanCodeSwitchType(1)
  screen.fill((0, 0, 0))
  screen.text(koi.strVal,5,10,2,(255, 255, 255))
  screen.text(koi.xywh[0],5,40,1,(255, 255, 255))
  screen.text(koi.xywh[1],5,60,1,(255, 255, 255))
  screen.text(koi.xywh[2],5,80,1,(255, 255, 255))
  screen.text(koi.xywh[3],5,100,1,(255, 255, 255))
  screen.refresh()

588B

Code Scanner.py