[PictoBloxExtension]

QR Code Scanner

Extension Description

Detect, identify and read QR codes from images.

Available in: Block Coding, Python Coding
Mode: Stage Mode
WiFi Required: No
Compatible Hardware in Block Coding: evive, Quarky, Arduino Uno, Arduino Mega, Arduino Nano, ESP32, T-Watch, Boffin, micro:bit, TECbits, LEGO EV3, LEGO Boost, LEGO WeDo 2.0, Go DFA, None
Compatible Hardware in Python: Quarky, None
Object Declaration in Python: qr = QRCodeScanner()
Extension Catergory: Other

Introduction

What is QR Code?

QR Code is a machine-scannable image that can be instantly read, using a smartphone camera. Every QR code consists of a number of black squares and dots that represent some encoded piece of information; like alphabets, numbers, etc. When your Smartphone scans this code, it translates that encoded information that only computers can understand, into something that can be easily understood by humans.

The QR Code Scanner extension allows users to scan QR codes from the camera or stage and report the information:

QR Code Data
QR code position on the stage
QR code angle alignment on the stage

Accessing QR Code Scanner in Block Coding

Following is the process to add QR Code Scanner capability to the PictoBlox Project.

Open PictoBlox and create a new file.
Select the coding environment as Block Coding.
Next, click on the Add Extension button and add the QR Code Scanner extension.
You can find the QR Code Scanner blocks available in the project.

Accessing QR Code Scanner in Python Coding

Following is the process to add QR Code Scanner capability to the PictoBlox Project.

Open PictoBlox and create a new file.
Select the coding environment as Python Coding.
Next, click on the Add Modules/Libraries button and add the QR Code Scanner extension.
To access the library functions, you have to add the object declaration.
```
qr = QRCodeScanner()
```

Example Project Video

In this project, a QR code is generated with the help of a QR code generator website. credits – https://www.qr-code-generator.com/

The QR code is linked to a URL. Then, the QR code is scanned with the help of the QR code scanner extension of Pictoblox. The project is created by RS Junction.

PictoBlox Blocks

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Block Coding Examples

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Python Functions

right()

The function turns the sprite by the specified amount of degrees clockwise. This changes the direction the sprite is facing.

Syntax: right(angle = 15)

think()

The function gives its sprite a thought bubble with the specified text, which stays for the specified amount of seconds.

Syntax: think(message = “Hello!”, time = 0)

play()

The function will play the specified sound, with no pause to its script.

Syntax: play(sound_name = “Grunt”)

clear()

The function removes all marks made by the pen or stamping. It is the only pen block that the Stage can use.

Syntax: clear()

clearled()

The function turns off the specified RGB LED of Quarky (specified with the X and Y position of the LED).

Syntax: clearled(x_position = 1, y_position = 1)

readirsensor()

The function returns the IR sensor analog reading. The reading varies from 0 to 4095.

Syntax: readirsensor(sensor = “IRL”)

runtimedrobot()

The function moves the Quarky robot in the specified direction for the specified time. The direction can be “FORWARD”, “BACKWARD”, “LEFT”, and “RIGHT”.

Syntax: runtimedrobot(direction = “FORWARD”, speed = 100, time = 1)

playsounduntildone()

The function plays the specified audio on the Quarky speaker. The function has a callback, so other functions will be executed after the audio is played.

Syntax: playsounduntildone(audio = “QuarkyIntro”)

analysecamera()

This function is used to analyze the image received as input from the camera, for the feature.

Syntax: analysecamera()

analysecamera()

This function is used to analyze the image received as input from the camera, for the handwritten and printed text.

Syntax: analysecamera()

analysespeech()

When the function is executed, the recognition window will open and you will get a specified time during which PictoBlox will record whatever you say. Once recorded, the speech will be converted to the text of the language you spoke in and saved locally.

Syntax: analysespeech(time = 2, language = “en-US”)

setpickangle()

The function sets the pick action angle with the specified angle. This is useful to set a custom pick angle for the pick and place robot.

Syntax: setpickangle(angle = 40)

tf.expand_dims()

The function returns a tensor with a length 1 axis inserted at the index axis.

Syntax: tf.expand_dims(input, axis = 0, name)

setoffset()

The function calibrates the angles of the servo motors and saves them in the memory of Quarky. Due to some mechanical assembly errors, there may be some misalignment of the servos which can be handled with this block.

Syntax: setoffset(Front Right Hip Offset = 0, Front Left Hip Offset = 0, Front Right Leg Offset = 0, Front Left Leg Offset = 0, Back Right Hip Offset = 0, Back Left Hip Offset = 0, Back Right Leg Offset = 0, Back Left Leg Offset = 0)

pirstatus()

The function reports the state of the PIR sensor connected to the selected pin. The function returns 1 when it is HIGH (or 3.3V) or 0 when it is LOW (or 0V).

Syntax: pirstatus(pin = “D3”)

adaio.connecttoadafruitio()

The function creates an Adafruit IO object that set up the API connection between the PictoBlox and the Adafruit server with the specified username and AIO key.

Syntax: adaio.connecttoadafruitio(username = “username”, AIO Key = “AIO key”)

setoffset()

The function calibrates the angle servo motors and saves them in the memory of Quarky. Due to some mechanical assembly errors, there may be some misalignment of the servos which can be handled with this block.

Syntax: setoffset(Head = 0, Front Left = 0, Front Right = 0, Back Left = 0, Back Right = 0)

setlegoffset()

The function calibrates the angles of the hip and foot servo motors and saves them in the memory of Quarky. Due to some mechanical assembly errors, there may be some misalignment of the servos which can be handled with this block.

Syntax: setlegoffset(Left Hip Offset = 0, Right Hip Offset = 0, Left Foot Offset = 0, Right Foot Offset = 0)

runrobot()

The function allows the robot to move in the specified direction at a given speed.

Syntax: runrobot(direction = “forward”, speed = 100)

moveservo()

The function sets the servo motor connected to the specified servo pin of the Quarky Expansion board to the specified angle. The expansion board can control up to 8 servos simultaneously.

Syntax: moveservo(servo port = 1, angle = 40)

math.acosh()

The function is used to return the inverse hyperbolic cosine of a given value.

Syntax: math.acosh(x)

roboticArm.setoffset()

The function takes the current end–effector position and adds an offset value to it. It then updates the end–effector position in the length and Z directions according to the specified direction. The function also normalizes the end–effector position, ensuring that the calculated offset is applied consistently.

Syntax: roboticArm.setoffset(length Offset = 0, Z Offset = 0)

calibrateir()

This function moves the robot forward and reverse for a set time, collecting IR sensor data on white and black lines.

Syntax: calibrateir()

disablebox()

The function disables the automatic display of the box on face detection on the stage.

Syntax: disablebox()

left()

The function turns the sprite by the specified amount of degrees counter-clockwise. This changes the direction the sprite is facing.

Syntax: left(angle = 15)

switchcostume()

The function changes its sprite’s costume to a specified one.

Syntax: switchcostume(costume_name = “Tobi Jump”)

stopallsounds()

The function will stop any sounds currently being played on all sprites and the Stage. Pressing the Stop button will also stop all sounds, but is rarely used as it also stops all the other scripts running in the project.

Syntax: stopallsounds()

distance()

The function reports the Euclidean distance, in pixels, between it and the mouse-pointer or a specified sprite’s costume center.

Syntax: distance(object_name = “_edge_”)

down()

The function will make its sprite continuously pen a trail wherever it moves until the up() function is used. The color, size, and transparency of the trail can be changed with other functions.

Syntax: down()

readdigitalinput()

The function reads the digital value of the sensors connected to the specified pin. The function returns True or False.

Syntax: readdigitalinput(pin)

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QR Code Scanner

Introduction

What is QR Code?

Accessing QR Code Scanner in Block Coding

Accessing QR Code Scanner in Python Coding

Example Project Video

PictoBlox Blocks

Block Coding Examples

Python Functions

Python Coding Examples

Company

Community

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