bluetooth intro

src/SUMMARY.md

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     - [Pin layout](./joystick/pin-layout.md)
     - [Circuit](./joystick/circuit.md)
     - [Print ADC Values](./joystick/print-adc-values.md)
+- [Bluetooth](./bluettoh/index.md)
 - [Projects](./projects.md)

src/bluettoh/index.md

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+# Bluetooth
+
+Bluetooth needs no introduction. You probably use it daily; connecting your wireless headphones with your phone, wireless mouse, smartwatch, and more. In smart homes, Bluetooth helps link different devices. For example, you can control lights, appliances, and thermostats using Bluetooth-enabled apps on your phone.
+
+<div class="alert-box alert-box-info">
+    <span class="icon"><i class="fa fa-info"></i></span>
+    <div class="alert-content">
+        <b class="alert-title">Did you know?</b>
+            <p>Bluetooth was named after King Harald "Bluetooth" Gormsson. During a meeting, Jim Kardach from Intel suggested it as a temporary code name. Kardach later said, "King Harald Bluetooth…was famous for uniting Scandinavia just as we intended to unite the PC and cellular industries with a short-range wireless link"</p>
+    </div>
+</div>
+
+
+## Categories  
+
+Bluetooth technology is divided into two main types: Bluetooth Classic and Bluetooth Low Energy (BLE).  
+
+### **Bluetooth Classic**  
+Bluetooth Classic is the original version of Bluetooth, commonly used in devices that require continuous data transfer, such as wireless headsets, speakers, and mouse. Before BLE was introduced, it was simply called "Bluetooth," but now it's referred to as Bluetooth Classic to distinguish it from BLE. It offers higher data rates, making it ideal for real-time applications like audio streaming.  
+
+### **Bluetooth Low Energy (BLE)**  
+BLE is designed for low power consumption, making it great for devices that send small amounts of data from time to time. This is especially useful for battery-powered IoT devices, such as fitness trackers and environmental sensors. Compared to Classic, BLE has lower latency, meaning it takes less time to start sending or receiving data after a connection is made.
+
+### **Dual Mode**  
+Many modern devices support both Bluetooth Classic and BLE, a feature known as "Dual Mode." For example, a smartphone might use Classic for streaming music and BLE to connect to a smartwatch.  
+
+In general, Bluetooth Classic is better suited for continuous data transmission, such as real-time audio and video, while BLE is ideal for low-power communication with health monitors, sensors, and other small gadgets.  
+
+### **What About the ESP32?**  
+The ESP32 supports **dual-mode Bluetooth**, meaning it is compatible with both Bluetooth Classic and BLE.