Best mobile phone of May 2025 under 20000

Motorola edge 50 fusion

Key highlights of the mobile

  • Highlights
  • 8 GB RAM | 128 GB ROM
  • 17.02 cm (6.7 inch) Full HD+ Display
  • 50MP + 13MP | 32MP Front Camera
  • 5000 mAh Battery
  • 7s Gen 2 Processor

Here is another important thing is that is Motorola provides one of the best near-stock Android OS after Google Pixel phones. It means you would get the fewest preinstalled apps, like Chinese brands, which provide good price vs performance but a low level of mobile interface experience.

PPI (Pixels per inch) vs resolution

Pixels are the smallest unit that makes up an image. Pixels are made up of RGB (Red, Green, and Blue) subpixels, and the intensity of each subpixel will decide the final output colors.

So basically, more pixels will make a better-looking and well-defined image.

You may have heard of the term PPI (Pixels Per Inch), which defines the number of pixels that an image or video has per inch of its area.

There is a second important thing, and that is resolution, which gives an idea about an image. A higher-resolution image would have a higher number of pixels, whereas a lower number of pixels would make a lower-resolution image.

Now let’s take an example of a 720p image, which means that the image has 1280 pixels wide and 720 pixels high with an aspect ratio of 16:9.

Here is a chart for better clarity about the resolution

ResolutionMeasurementsNumber of pixels in total
480p (SD)640 x 480307,000
720p (HD)1280 x 720921,600
1080p (Full HD)1920 x 10802,073,600
4K (Ultra HD)3840 x 21608,294,400
8K (Ultra HD)7680 x 432033,177,600

Fun fact: The Human eye has a resolution of about 576 Megapixels.

Megapixels

Today, we will discuss the software ‘Megapixels’ vs ‘Hardware Megapixel’

First, you should know about the pixels. Pixels are the smallest unit that makes up an image. Pixels are made up of RGB (Red, Green, and Blue) subpixels, and the intensity of each subpixel will decide the final output colors.

So basically, more pixels will make a better-looking and well-defined image.

You may have heard of the term PPI (Pixels Per Inch), which defines the number of pixels that an image or video has per inch of its area.

There is a second important thing, and that is resolution, which gives an idea about an image. A higher-resolution image would have a higher number of pixels, whereas a lower number of pixels would make a lower-resolution image.

Normally, when we say megapixel of a camera, it means the number of photoreceptors on the camera. So higher the megapixels (physical), the better the image quality.

Now, see what happens with the software megapixels. Mobile camera takes (captures) the image and at the software level makes the image better by creating more details based on the existing image details. Different software algorithms are used for this purpose.

By this method, mobile phones create better-looking images with fewer physical megapixels.

On the other hand, we, as normal consumers, only see or have a perception that higher megapixels means a better camera, and we don’t investigate the reality behind it, whether it is physical megapixels or software-based.

That’s the reason why Apple’s camera is better than most of its Chinese competitors because the former one has better physical camera capabilities.

Digital zoom Vs Optical zoom

  • You might have heard of smartphones with large zoom capabilities. But there is a catch to it. One type of zoom is camera zoom, and the other is a software-based zoom.
  • So, optical zoom zooms into the frame before capturing an image. Digital zoom zooms in after taking an image.
  • In an optical zoom camera lens, parts move to achieve the zoom facility. Digital zoom enlarges the selected parts of the captured image. But in the second option (Digital zoom), there is a loss of clarity.
  • Let’s take an example of the OnePlus 13, which has an optical zoom of 3x and a digital zoom of 30x
  • The reason for deformity in zooming in digital zoom mode is that pixels are fixed, but you are zooming in, which makes the density of pixels less on the same screen and image a little blur as the zoom increases.

Flexible Arduino

Arduino is widely used because it is open-source and widely documented.

We can make flexible Arduino on materials like polyimide, Polyethylene Terephthalate (PET), Thermoplastic Polyurethane (TPU)

A flexible Arduino can be made with photolithography. These circuits are the same as PCB (Printed Circuit Boards) and use copper strips as a conductive medium.

Advantages of a flexible Arduino

  • It can be placed on wearable clothes, where it would be connected to the different sensors for reading different information.