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QR Code Scanner - Blocks, Python Functions, Projects | PictoBlox Extension
[PictoBloxExtension]
PictoBlox Extension

QR Code Scanner

QR scanner
Extension Description
Detect, identify and read QR codes from images.
  • STEMpedia-Rocket-800x800 Available in: Block Coding, Python Coding
  • STEMpedia-Rocket-800x800 Mode: Stage Mode
  • STEMpedia-Rocket-800x800 WiFi Required: No
  • STEMpedia-Rocket-800x800 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
  • STEMpedia-Rocket-800x800 Compatible Hardware in Python: Quarky, None
  • STEMpedia-Rocket-800x800 Object Declaration in Python: qr = QRCodeScanner()
  • STEMpedia-Rocket-800x800 Extension Catergory:

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:

  1. QR Code Data
  2. QR code position on the stage
  3. 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.

  1. Open PictoBlox and create a new file.
  2. Select the coding environment as Block Coding.
  3. Next, click on the Add Extension button and add the QR Code Scanner extension.
  4. 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.

  1. Open PictoBlox and create a new file.
  2. Select the coding environment as Python Coding.
  3. Next, click on the Add Modules/Libraries button and add the QR Code Scanner extension.
  4. 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.

Read More

PictoBlox Blocks

The block reports value 2 of the webhook event.
The block sets the selected servo motor angle to the specified angle in the specified time. This creates a smooth motion for the servo motor from the current angle to the specified angle.
The block sets the servo motors of humanoid legs & hips to the specified angles at the speed.
The block makes the selected motor to run at the specified speed.
The block makes a request to ChatGPT to translate the text specified in the first input field into the language specified in the second input field. The response of ChatGPT is then stored in PictoBlox and can be accessed using the get AI response block.
This block allows users to measure the amount of time that has passed since their device was turned on or since the timer was reset. It returns this time in milliseconds, making it a useful tool for measuring elapsed intervals.
This block allows the user to control a Brushless DC (BLDC) motor via Pulse Width Modulation (PWM) on a selected pin. The speed of the motor is adjustable, allowing the user to create the desired speed profile.
The block sets the cursor mode on a given LCD display. The mode specifies how the cursor will appear when characters are written or commands are executed. 
This block is used to move the robotic arm from its current position to a specific X, Y, and Z coordinate position over a specified period of time. This block breaks up the motion into smaller line segments for the robot to more accurately and efficiently reach the desired end position.
Set the IR threshold for onboard or external sensors connected to Quarky’s analog pin.
Starts the script whenever you press a specified key of the keyboard.
Rotate the sprite anti-clockwise a specified amount. Turn with 12 for a full rotation.
Returns the character to its default size.
Sets the color of the pen lines that can be drawn.
Displays a custom pattern from list on the quarky LED display.
Runs the blocks inside if the specified face expression is detected.
Changes the speed of the quarky robot. Speed can be set as slow, normal and fast.
After connection is established, turns the wizbot a specified number of step to the right.
Runs the blocks inside if a specified button is pressed of the wizbot.
The block is used to draw or fill a rectangle on the evive TFT display. It takes the coordinates of a point as input alongside the required width, height, and color and draws/fill the rectangle.
The block reads the state of the digital pin on evive (“High” or “Low”). If the state of the pin is “High”, it returns True, else False.
enable pin state monitor
The block allows the user to remotely monitor the live status of devices and debug them by displaying the values of all the pins – both digital and analog.
go to block
This block moves the robotic arm’s end-effector to the specified X, Y, and Z positions in the specified time.
do hand action block
This block is to assign pre-defined hand actions to our Humanoid Robot.
The block sets its sprite’s X and Y position to that of the mouse-pointer or another sprite — in other words, it moves the sprite to a random position, the mouse-pointer, or another sprite.
The block changes the Stage’s backdrop to the specified one.
The block changes the volume of a sprite by the specified amount.
Depending on the argument, it is either a Cap block (all or this script), or a Stack block (other scripts in sprite). It is the only block that changes its shape.
The block sends a broadcast throughout the whole Scratch project — any scripts that are halted with the When I Receive () block and are set to the broadcast will activate. This broadcast block lets scripts send broadcasts, and have them wait until all scripts are activated by the broadcast ends.
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