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var Gpio = require('onoff').Gpio; //include onoff to interact with the GPIO
var LED = new Gpio(4, 'out'); //use GPIO pin 4, and specify that it is output
var blinkInterval = setInterval(blinkLED, 250); //run the blinkLED function every 250ms

function blinkLED() { //function to start blinking
  if (LED.readSync() === 0) { //check the pin state, if the state is 0 (or off)
    LED.writeSync(1); //set pin state to 1 (turn LED on)
  } else {
    LED.writeSync(0); //set pin state to 0 (turn LED off)
  }

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Form

This is a simple form component created using React. It is used to collect data from the user and submit it to the server.

Features

This component has the following features:

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useTimeout

A custom React Hook that allows you to call a callback after a specified delay.

Usage

import { useTimeout } from './useTimeout';

const callback = () => {

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TaskContract

A smart contract for a Todo App on the Ethereum blockchain.

Overview

TaskContract is a smart contract for a Todo App on the Ethereum blockchain. It allows users to add tasks and delete tasks. It also allows users to view their own tasks.

Functions

TaskContract has the following functions:

• addTask(string memory taskText, bool isDeleted) - adds a new task to the contract.

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import {cleanup, fireEvent, render} from '@testing-library/react';
import CheckboxWithLabel from '../CheckboxWithLabel';

// Note: running cleanup afterEach is done automatically for you in @testing-library/[email protected] or higher
// unmount and cleanup DOM after the test is finished.
afterEach(cleanup);

it('CheckboxWithLabel changes the text after click', () => {
  const {queryByLabelText, getByLabelText} = render(
    <CheckboxWithLabel labelOn="On" labelOff="Off" />,

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// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/Strings.sol";
import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/access/Ownable.sol";
import "@openzeppelin/contracts/utils/Counters.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "./IContent.sol";

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// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to

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Split Weeks

This code finds split weeks for a given year.

Usage

To use the code, define year as the year to find split weeks for. Then call the getMonthlyDates and isSplitWeek functions.

let year = new Date().getFullYear()

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CheckBox

Checkbox is a React component used to allow users to select or deselect an option.

Usage

To use the CheckBox component, import it into your React component:

import CheckBox from 'react-checkbox';

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  const handleSubmit = async e => {
    e.preventDefault();

    // @TODO - handle validation
    // ...

    // @TODO - handle submit based on operation
    switch (operation) {
      case 'add':
        console.log(dataType, state);