# Mac CH340K Driver Installation Installation Guide ## Step 1: Plug in Lonely Binary ESP32-S3 1. **Connect your ESP32-S3** to the **left USB port** (labeled "UART") - A popup will appear: "Allow accessory to connect?" - **Allow Accessory Connection**  ## Step 2: Verifying the USB Connection 1. Open **System Information**: - Click the Apple menu () > **About This Mac** > **System Report**. - Alternatively, search for "System Information" in Spotlight. 2. In the System Information window, navigate to **Hardware** > **USB** in the left sidebar. 3. Look for your CH340-based device in the USB Device Tree (e.g., "USB-Serial Controller" or "CH340"). If it appears, the device is detected by your Mac. > **Note**: If the device is not listed, check your USB connection or power cable. make sure the power cable you are using support both Data and Power transfer. Try different USB port, another cable or another mac ## Step 3: Download Driver 1. Go to [WCH Official Website](https://www.wch-ic.com/downloads/CH341SER_MAC_ZIP.html) https://www.wch-ic.com/downloads/CH341SER_MAC_ZIP.html 2. Download the Mac version (CH341SER_MAC.ZIP) 3. Extract the ZIP file and 4. Run "CH34xVCPDriver.pkg" ## Step 4: Grant Extension Permissions 1. **Open System Preferences:** - Click Apple menu → System Preferences - Or use Spotlight: `Cmd + Space` and type "System Preferences" 2. **Go to Security & Privacy:** - Click "Security & Privacy" - Click the "General" tab  3. **Allow System Extensions:** - Look for "CH34xVCPDriver" - Click **"Allow"** next to it - You may need to click the lock icon and enter your password -  4. **Restart Your Mac:** - After allowing the extension, restart your Mac - This ensures the driver is properly loaded ## Step 6: Verifying the Driver To verify the USB port for a CH340 driver installation on a Mac, you can use Terminal 1. Open the **Terminal** application (found in Applications > Utilities). 2. Run the following commands to list available serial ports: ``` bash % cd /dev % ls tty.* ``` 4. Look for a device name like tty.wchusbserial, tty.usbserial, or similar. This indicates that the CH340 driver is installed and the device is recognized. ## Summary ### Key Points: - **Main USB port:** No driver needed, works automatically - **Backup UART port:** Requires CH340K driver installation - **Mac users:** Remember to allow accessory connection and extension permissions # Support If you encounter any issues, please go to [https://lonelybinary.com](https://lonelybinary.com) and click the Support button located in the bottom right corner. Our team is ready to assist you. [](https://lonelybinary.com) or contact us at office@lonelybinary.com --- Your Lonely Binary ESP32-S3 now has two fully functional USB ports for programming and communication! 🚀