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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

Moves the wizbot in arc length in specified direction and step length from the options.
The block is used to draw an outline of the triangle or a filled triangle from three points on evive TFT display. It takes the color and the 3 points for the corner of the triangle to draws a triangle.
When the block is executed it plays the tone of specified frequency/note for a specific duration/beat. The note and the beat can be selected from the drop-down menu. Also, the user can input the specific frequency and duration (in milliseconds).
get potentiometer's value
Dabble input module has 2 potentiometers whose value can be varied from 0 to 1023 by the user. This block reports the current value of the selected potentiometer.
go to block
The block sets the end-effector to the specified position on the selected axis and the other two positions remain the same.
This block sets the value of the selected servo by the value you enter. Whereas the angle of other servos remains the same.
The block changes the selected sprite’s X position to a specified value.
The block changes the specified effect on its sprite by the specified amount. There are seven different effects to choose from: colour, fisheye, whirl, pixelate, mosaic, brightness and ghost.
The block reports how loud the noise is that a microphone receives, on a scale of 0 to 100. To use this block, a microphone must be used, and so a message will appear on the screen, asking for permission to use the microphone. If you deny it, the block will report a loudness of 0 or -1.
The block picks a pseudorandom number ranging from the first given number to the second, including both endpoints. If both numbers have no decimals, it will report a whole number. For example, if a 1 and a 3 were inputted, the block could return a 1, 2 or 3. If one of the numbers has a decimal point, even .0, it reports a number with a decimal. For example, if 0.1 and 0.14 were given, the output will be 0.1, 0.11, 0.12, 0.13, or 0.14.
The block replaces the specified item; in other words, it changes the item’s content to the given text.
The function allows the user to add a particular face into the database from the camera or stage. The user can specify the name of the face with the argument as well. This addition of the face in the database is also stored inside the PictoBlox file while saving.
The block returns the specified parameter for the specified number card detected.
The function set the API keys for the Open Weather Map API calls.
The block returns the hex code of the Red, Green, and Blue values specified.
The block returns the state of the digital sensor connected to the specified pin of the Quarky.
The block does the step simulation for the Physics Engine. This block is required to run in a loop for the physics to work.
The block reports the moisture reading from the sensor. The value varies from 0 to 100%.
The block sends multiple data to the ThingSpeak channel with a delay of the specified time seconds. The data is mapped to the 8 fields of the ThingSpeak channel.
The block executes the oscillator according to stored parameters for the servo motor and the current angle specified in the block.
The block sets the oscillator parameters for the selected servo motor.
The block moves the servo motors of the pick and place robot to the place angle specified by the user.
The block sets the user API key of the ChatGPT in the project. 
The block makes the specified LED turn ON or OFF on the 8×8 Dot Matrix display.
This block is used to move the end-effector to the specified position of the selected axis, while the other two positions remain the same.
This block allows the user to control the end-effector of a robotic arm to move in a specified axis by a set value, with all other axes remaining constant.
This block is use for set the motor speed while doing the line following and Turning.
Moves the wizbot forward for a √2 step length on the grid pattern.
The block sets the time on evive’s Real Time Clock (RTC) to the time specified by the user in the input.
get sensor reading 2
Dabble phone sensor module give the real-time reading of the following sensors to evive: Accelerometer, gyroscope, proximity sensor, magnetometer, light meter, sound meter, GPS, temperature sensor and barometer. This block reports the current value of the selected sensor.
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