Read battery percentage using Arduino

  • Is it possible to read battery info of an Android with an Arduino via Bluetooth without an external app on the Android side .

    For example . Bluetooth connection to a cars media player shows battery life , signal strength ,etc....

  • @vijayvarghese The answer is "NO". If my guess is correct, you might have misunderstood the working of Classic Bluetooth and Bluetooth Low Energy(BLE). You cannot acquire battery percentages, RAM usage directly just by connecting HC-05 to Arduino and connecting it to mobile phones. Because our mobile phones don't share any characteristics to outside just through Bluetooth.

    The example of car which you have stated is just applicable to the automobile field. If you are able to read the battery percentage, signal strength kind of parameters that means that the car's BLE has been programmed with those characteristics to be displayed. To be simple, it means that the Bluetooth inside the car has been given permission to display those. It depends upon the BLE configuration used and security levels. You cannot access any parameters from mobile phone just with Arduino and HC-05 Bluetooth module.

    If you want to learn more about this please read the post in makergram named "Automatic pairing of ESP32 using BLE" where @salmanfaris has given a detailed explanation of how BLE works. If you want to work out how BLE's work, try connecting your MI Band(Or any smart wrist bands) to the nRF Connect Mobile app(Can be found in play store for free). Try seeing what parameters are displayed. please write back in case of queries.!!

  • @kowshik1729 Thank you ..

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  • Very much informative!!!!

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  • If you are using raspberry pi as one of your main computers and have separate monitor, keyboard and mouse, then you might be tired of copy and pasting terminal commands and codes while doing projects with raspberry pi, because running chromium-browser and reading tutorial will pi slower and using a sperate keyboard and mouse use our workbench space too.

    recently I read a blog Share your keyboard and mouse between computers with Barrier by Gordon Hollingworth which is cool.

    In that blog, he mentioned a software called barrier, it's a software that will allow you to use a single keyboard and mouse to control multiple computers by physically turning a dial on the box to switch the machine you're controlling at any given moment. The barrier does this in software, allowing you to tell it which machine to control by moving your mouse to the edge of the screen, or by using a keypress to switch focus to a different system.

    Follow these to share your computer keyboard and mouse with the raspberry pi

    First, we need setup raspberry pi

    Step 1: Download and Install Raspberry Pi OS on SD Card

    Step 2: Connect raspberry pi to the wi-fi network

    Step 3: Install barrier, for that open your terminal (Ctrl + T) and paste or enter the following

    sudo apt install barrier

    Then click enter.

    Step 4: Setup barrier, Open barrier by typing barrier on the terminal, if you successfully installed the barrier you can see like this.


    Select option Client (Use another computer's mouse and keyboard) and Select Auto config option too, also note the Screen name, which we need for the server.

    That's all next we need to set up the desktop/laptop computer.

    Step 5: Download and Install barrier on desktop or laptop computer (The Server), download link

    Step 6: Set up the barrier by selecting Server and position your monitor on barrier software. 004.png

    To Position, the screen clicks the configure server.


    Here, to drag and drop the monitor icon to the desired position you need on the grid.


    double click the screen and set the screen name, you can obtain the screen name from the raspberry pi barrier client. (See Step 4)


    after setup, it should be like this. Then click OK


    in the following screen, click Apply and Just wait few seconds then try to move the mouse to the corner. Yes, It should work.

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  • @rafitc99 Looks cool, Thanks for sharing. 👍

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  • This is a speaker call for MakerChat by MakerGram. MakerChat is a webinar series where makers from different domain sharing their expertise with other fellow makers. MakerGram is an Open Community Platform for Makers and hardware enthusiasts to empower them by promoting learning, sharing and collaboration.




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  • The Challenge

    Do you think you can come up with some interesting ideas revolving around Amazon Alexa? What if we could help you build that idea into a reality. Tell us about your idea and the best one wins an Amazon Alexa Echo Dot.

    🧲 Bonus points for those solutions involving Covid-19 or promoting social-distancing.


    Application - The application starts on 26th June 2020. Closing - The registration will end on 17th July 2020. Results - The results declared by last week of July

    For Registration:


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