{"id":1271,"date":"2025-04-14T20:00:14","date_gmt":"2025-04-14T20:00:14","guid":{"rendered":"https:\/\/www.bleuio.com\/blog\/?p=1271"},"modified":"2025-04-15T07:30:49","modified_gmt":"2025-04-15T07:30:49","slug":"control-your-windows-pc-brightness-over-ble-using-bleuio","status":"publish","type":"post","link":"https:\/\/www.bleuio.com\/blog\/control-your-windows-pc-brightness-over-ble-using-bleuio\/","title":{"rendered":"Control Your Windows Computer Over BLE Using BleuIO"},"content":{"rendered":"\n<p>Controlling your computer wirelessly might sound complex \u2014 but with the power of Bluetooth Low Energy (BLE) and the <strong>BleuIO dongle<\/strong>, it\u2019s surprisingly simple. In this guide, we\u2019ll walk through a creative example where you can control the brightness of your Windows PC using BLE commands sent from your mobile phone using BLE app.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What This Project Does<\/h2>\n\n\n\n<p>Using a BleuIO dongle connected to a Windows PC, we enable BLE communication using the Serial Port Service (SPS). When a BLE-enabled phone connects to the dongle and sends a value (from 1 to 10), the PC receives this data and adjusts its screen brightness accordingly \u2014 all in real-time.<\/p>\n\n\n\n<p>It&#8217;s a simple and powerful demonstration of BLE-to-system integration, and it&#8217;s only the beginning of what&#8217;s possible with BleuIO.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tools &amp; Requirements<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Windows 11 PC<\/li>\n\n\n\n<li><strong><a href=\"https:\/\/www.bleuio.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">BleuIO dongle<\/a><\/strong><\/li>\n\n\n\n<li>Python 3.11+<\/li>\n\n\n\n<li>nRF Connect app (on <a href=\"https:\/\/play.google.com\/store\/apps\/details?id=no.nordicsemi.android.mcp&amp;hl=en\" target=\"_blank\" rel=\"noreferrer noopener\">Android<\/a> or <a href=\"https:\/\/apps.apple.com\/us\/app\/nrf-connect-for-mobile\/id1054362403\" target=\"_blank\" rel=\"noreferrer noopener\">iOS<\/a>)<\/li>\n\n\n\n<li>Installed Python libraries:\n<ul class=\"wp-block-list\">\n<li><a class=\"\" href=\"https:\/\/pypi.org\/project\/pyserial\/\"><code>pyserial<\/code><\/a> \u2013 for serial communication with the BleuIO dongle.<\/li>\n\n\n\n<li><a class=\"\" href=\"https:\/\/pypi.org\/project\/screen-brightness-control\/\"><code>screen-brightness-control<\/code><\/a> \u2013 to programmatically control screen brightness on Windows.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p>Install both with:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><code>python -m pip install --user pyserial screen-brightness-control<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">How It Works <\/h2>\n\n\n\n<p>This project uses the BleuIO dongle in  SPS Server mode, which allows it to receive data over Bluetooth Low Energy (BLE) from a connected device \u2014 in our case, a smartphone using the nRF Connect app.<\/p>\n\n\n\n<p>Here\u2019s a breakdown of how everything works together:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Initialize the Dongle on the PC ( SPS)<\/h3>\n\n\n\n<p>When you run the Python script on Windows, it sends the following commands to the BleuIO dongle via serial:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>AT+ADVSTART<\/code> \u2192 Starts advertising the dongle so it becomes discoverable over BLE.<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Connect to BleuIO from Your Phone (Using nRF Connect)<\/h3>\n<\/blockquote>\n\n\n\n<p>On your mobile device, open the <strong>nRF Connect<\/strong> app:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tap <strong>\u201cScan\u201d<\/strong> and look for a device named <strong>\u201cBleuIO\u201d<\/strong><\/li>\n\n\n\n<li>Tap <strong>\u201cConnect\u201d<\/strong> to establish a BLE connection<\/li>\n<\/ul>\n\n\n\n<p>Once connected, you\u2019ll see a list of services and characteristics provided by the BleuIO dongle.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Identify the Correct BLE Characteristic to Send Data<\/h3>\n\n\n\n<p>In the attribute table:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Look for a writable characteristic under one of the unknown services.<\/li>\n\n\n\n<li>You&#8217;ll often see one with the following properties:\n<ul class=\"wp-block-list\">\n<li>Write Without Response<\/li>\n\n\n\n<li>(Optionally also Notify)<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>The UUID will look like: <code>0783B03E-8535-B5A0-7140-A304D2495CBA<\/code><\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"473\" height=\"1024\" src=\"https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2025\/04\/image-473x1024.png\" alt=\"\" class=\"wp-image-1273\" style=\"width:213px;height:auto\" srcset=\"https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2025\/04\/image-473x1024.png 473w, https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2025\/04\/image-139x300.png 139w, https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2025\/04\/image-709x1536.png 709w, https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2025\/04\/image.png 739w\" sizes=\"auto, (max-width: 473px) 100vw, 473px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Send the SPS Command from the App<\/h3>\n\n\n\n<p>Now that you&#8217;re connected and have found the correct characteristic:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Tap the <strong>write icon (\u21a5)<\/strong> on that characteristic<\/li>\n\n\n\n<li>Choose <strong>&#8220;UTF-8 string&#8221;<\/strong> as the format (not hex!)<\/li>\n\n\n\n<li>In the message field, enter something like: <code>AT+SPSSEND=5<\/code><\/li>\n\n\n\n<li>Tap <strong>&#8220;Send&#8221;<\/strong><\/li>\n<\/ol>\n\n\n\n<p>This sends a Bluetooth message to the BleuIO dongle, which forwards it via the SPS protocol to the Python script on your PC.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Python Script Reads and Acts on the Messag<\/strong>e<\/h3>\n\n\n\n<p>On the PC, the Python script reads the incoming SPS message and extracts the number from the <code>AT+SPSSEND=<\/code> command. It then adjusts your screen brightness using the <code>screen-brightness-control<\/code> library.<\/p>\n\n\n\n<p>For example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sending <code>AT+SPSSEND=1<\/code> \u2192 brightness set to <strong>10%<\/strong><\/li>\n\n\n\n<li>Sending <code>AT+SPSSEND=5<\/code> \u2192 brightness set to <strong>50%<\/strong><\/li>\n\n\n\n<li>Sending <code>AT+SPSSEND=10<\/code> \u2192 brightness set to <strong>100%<\/strong><\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"357\" src=\"https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2025\/04\/image-1-1024x357.png\" alt=\"\" class=\"wp-image-1274\" srcset=\"https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2025\/04\/image-1-1024x357.png 1024w, https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2025\/04\/image-1-300x104.png 300w, https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2025\/04\/image-1-768x267.png 768w, https:\/\/www.bleuio.com\/blog\/wp-content\/uploads\/2025\/04\/image-1.png 1370w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Repeating<\/h3>\n\n\n\n<p>You can send new values anytime while connected \u2014 and your computer will respond instantly by updating the brightness accordingly.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Full Python Script<\/h2>\n\n\n\n<p>Here\u2019s the script used in the project:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import serial\nimport time\nimport screen_brightness_control as sbc\n\nBLEU_IO_PORT = \"COM4\"  # Update this to match your BleuIO COM port\nBAUD_RATE = 9600\n\ndef set_brightness(level):\n    brightness = int(max(10, min(100, level * 10)))\n    try:\n        sbc.set_brightness(brightness)\n        print(f\"Brightness set to {brightness}%\")\n    except Exception as e:\n        print(f\"Failed to set brightness: {e}\")\n\ndef setup_bleuio(ser):\n    commands = &#91;\n        b'AT+SPS=1\\r\\n',\n        b'AT+ADVSTART\\r\\n'\n    ]\n    for cmd in commands:\n        ser.write(cmd)\n        time.sleep(0.5)\n    print(\"BleuIO is in Peripheral + SPS mode, now advertising...\")\n\ndef read_message(ser):\n    buffer = \"\"\n    while True:\n        if ser.in_waiting:\n            data = ser.read(ser.in_waiting).decode(\"utf-8\", errors=\"ignore\")\n            buffer += data\n            while \"\\r\\n\" in buffer:\n                line, buffer = buffer.split(\"\\r\\n\", 1)\n                yield line.strip()\n        else:\n            time.sleep(0.1)\n\ndef process_message(msg):\n    if not msg or msg.startswith(\"AT+\") or \"Invalid\" in msg or \"CONNECTED\" in msg or \"ADVERTISING\" in msg:\n        return\n\n    print(f\"Received message: '{msg}'\")\n    try:\n        if \"=\" in msg:\n            _, value = msg.split(\"=\", 1)\n        else:\n            value = msg\n        val = int(value.strip())\n        if 1 &lt;= val &lt;= 10:\n            set_brightness(val)\n        else:\n            print(\"Value out of range (1\u201310)\")\n    except ValueError:\n        print(\"Invalid message format\")\n\ndef main():\n    try:\n        with serial.Serial(BLEU_IO_PORT, BAUD_RATE, timeout=1) as ser:\n            setup_bleuio(ser)\n            print(\"Waiting for BLE messages via SPS from your phone...\")\n            for msg in read_message(ser):\n                process_message(msg)\n    except serial.SerialException as e:\n        print(f\"Serial error: {e}\")\n    except KeyboardInterrupt:\n        print(\"Exiting...\")\n\nif __name__ == \"__main__\":\n    main()\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">What is SPS on BleuIO?<\/h2>\n\n\n\n<p>SPS stands for <strong>Serial Port Service<\/strong>, a custom BLE profile supported by BleuIO to send and receive data like a UART over BLE.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Key SPS AT Commands:<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>AT+SPSSEND=message<\/code> \u2192 Sends data via BLE from client to host or vice versa<\/li>\n<\/ul>\n\n\n\n<p>In our case, the <strong>mobile phone is the BLE client<\/strong> sending data to BleuIO, which is the <strong>peripheral\/server<\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Use Cases &amp; Future Ideas<\/h2>\n\n\n\n<p>This project is just the beginning! Here are more ways to expand on it:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Control volume<\/strong> using BLE<\/li>\n\n\n\n<li><strong>Send commands to launch apps or toggle Wi-Fi<\/strong><\/li>\n\n\n\n<li>Build a BLE-based <strong>authentication system<\/strong> for login or locking\/unlocking the screen<\/li>\n\n\n\n<li>Lock\/sleep windows computer<\/li>\n<\/ul>\n\n\n\n<p>Controlling your computer via Bluetooth from a phone is now as easy as a few lines of Python and a BLE dongle like BleuIO. This project is a great foundation for building more interactive, wireless automation solutions \u2014 from IoT control panels to personal smart systems.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Controlling your computer wirelessly might sound complex \u2014 but with the power of Bluetooth Low Energy (BLE) and the BleuIO dongle, it\u2019s surprisingly simple. In this guide, we\u2019ll walk through a creative example where you can control the brightness of your Windows PC using BLE commands sent from your mobile phone using BLE app. What [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1277,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,2],"tags":[],"class_list":["post-1271","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bleuio","category-bleuio-tutorial"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Control Your Windows Computer Over BLE Using BleuIO - BleuIO - Create Bluetooth Low Energy application<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bleuio.com\/blog\/control-your-windows-pc-brightness-over-ble-using-bleuio\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Control Your Windows Computer Over BLE Using BleuIO - BleuIO - Create Bluetooth Low Energy application\" \/>\n<meta property=\"og:description\" content=\"Controlling your computer wirelessly might sound complex \u2014 but with the power of Bluetooth Low Energy (BLE) and the BleuIO dongle, it\u2019s surprisingly simple. 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