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import React, { useCallback, useEffect, useMemo, useState } from "react";

export const secondsToMMSS = (seconds) => {
  // Ensure the input is a non-negative number
  if (isNaN(seconds) || seconds < 0) {
    return "00:00";
  }
  // Calculate minutes and remaining seconds
  const minutes = Math.floor(seconds / 60);
  const remainingSeconds = Math.floor(seconds % 60);

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magick convert -density 300 ./old.pdf -brightness-contrast 20X10 -contrast-stretch 1% -compress JPEG -quality 80 ./new.pdf

// For darkening / coloring light images - use -gamma .7

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This is bluetooth (BLE) Gatt protocol for Lenovo HS11 Smart weight scale. It uses Chipsea CST34M97 chip, similar to some Huawei scales.

Main service = 0000fff0-0000-1000-8000-00805f9b34fb
Send command Characteristic = 0000fff1-0000-1000-8000-00805f9b34fb
Receive data Characteristic = 0000fff4-0000-1000-8000-00805f9b34fb

To read last N weight measurements

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Gfit treadmill BLE protocol

What is this?

GFit by FutureGo is an android/ios app to read and control supported BLE treadmills - usually made in China but white-labelled and sold under different names. This is an effort to document the Bluetooth protocol for it, only for personal use.

Sold under brands - Fitkit, Cultsport, Voit.

Not in scope - Elliptical treadmill, Rowers (also supported by Gfit app, but not documented here)

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// Reference - https://github.com/ludwich66/Bluetooth-DMM/wiki/Protocol-all-Variants
// From my multimeter - Baba AD-900 (Generic name - ZOYI ZT-300AB)

// rawString = '1B-84-70-A1-49-DA-B8-7B-66-DA-3A' // few mv //mv enabled both mV and V flag
rawString = '1B-84-70-D1-3D-2B-75-7F-66-FA-3A'; // 3.764 V // enabled V flag

function zeroPad(num, places) {
  return String(num).padStart(places, '0');
} 

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obj = {
  a: 123,
  get ab() {return 456},
  get abc() {return this.a},
}

obj.a
obj["a"+"b"]

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[
  "sec-numeric-types-bigint-unsighedRightShift",
  "sec-allocatedtypedarray",
  "sec-typedarray-species-create",
  "sec-running-execution-context",
  "sec-evaluate-expression-key-property-access",
  "sec-evaluate-identifier-key-property-access"
]

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// IsPropertyReference?

// 1. Different notations for accessing a property name

foo.bar() // ✅
foo["any string here"]() // ✅

// 2 Property name can also be a symbol - inbuilt or custom

someArray[Symbol.iterator].toString() // ✅

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{
	repositoryOwner(login: "bendtherules") {
		repositories(first: 100, isFork: true) {
			nodes {
				id
				nameWithOwner
				refs(refPrefix: "refs/heads/", last: 100) {
					edges {
						node {
							branchName: name

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*{background:#5d3a3a;margin:0;}p{width:200px;height:200px;background:#b5e0ba;}