CH340 Windows 10 driver download

This is the most basic test:

1. Open Device Manager (Windows Key + X)

2. Expand “Ports (COM & LPT)”

3. Your CH340 should appear as “USB-SERIAL CH340 (COM#)”

4. Right-click it → Properties

5. Check the “Device status” box – it should say: “This device is working properly”

If it says anything else, there’s a problem. Note down the exact error message and check the troubleshooting section.

Test 2: Plug and Unplug Test

This tests if Windows recognizes the device consistently:

1. Open Device Manager and expand “Ports (COM & LPT)”

2. Watch the list while you unplug your CH340 device

3. The COM port entry should disappear (you’ll hear the USB disconnect sound)

4. Plug it back in

5. The COM port entry should reappear (you’ll hear the USB connect sound)

6. Check that the COM number stays the same

What this tells you: If the device appears and stays stable, your driver is working correctly. If it appears then disappears repeatedly, see the troubleshooting section about power problems.

Test 3: Identify Your COM Port Number

You’ll need to know your COM port number for programming. Here’s how to find it:

Method 1: From Device Manager

1. Device Manager → Ports (COM & LPT)
2. Look at your CH340 entry
3. It shows “USB-SERIAL CH340 (COM3)” – that number is your port
4. Write it down or take a screenshot!

Method 2: From Arduino IDE

1. Open Arduino IDE
2. Go to Tools → Port
3. You’ll see all available COM ports listed
4. The one that says “CH340” or appears when you plug in the device is yours

Pro tip: If you have multiple CH340 devices, label each one with its COM number using a piece of tape. For example: “COM3 – NodeMCU” or “COM5 – Pro Mini”

Test 4: Loopback Test (Advanced Verification)

Want to test if your CH340 can actually send and receive data? Try this loopback test:

What you need:

• Your CH340 USB to serial converter (the standalone module, not connected to Arduino)
• One jumper wire

Steps:

1. Unplug your CH340 module from any Arduino or other devices

2. Take a jumper wire and connect TX pin to RX pin on the CH340 module – this is called a “loopback”

3. Plug the CH340 into your computer

4. Open Arduino IDE

5. Go to Tools → Serial Monitor

6. Set the baud rate to 9600 (dropdown at bottom-right)

7. Type something in the text box at the top, like “Hello”

8. Press Enter or click Send

Expected result: You should see “Hello” appear in the monitor window below! This proves your CH340 can send and receive data.

Why this works: With TX and RX connected together, anything the CH340 sends out (TX) immediately comes back in (RX). It’s talking to itself!

If this test fails, but Device Manager shows the driver installed, you might have a hardware problem with the CH340 module itself.

Test 5: Test with Actual Arduino Board

The ultimate test – can you upload code?

Simple test sketch:

1. Connect your Arduino (Pro Mini, Nano, etc.) to the CH340 using proper wiring (we’ll cover this in detail in the next section)

2. Open Arduino IDE

3. Paste this simple test code:

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);  // Usually pin 13
}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // Turn LED on
  delay(1000);                        // Wait 1 second
  digitalWrite(LED_BUILTIN, LOW);    // Turn LED off
  delay(1000);                        // Wait 1 second
}

4. Select your board: Tools → Board → Arduino Pro or Pro Mini (or your specific board)

5. Select processor: Tools → Processor → ATmega328P (5V, 16MHz) or 3.3V version

6. Select your COM port: Tools → Port → COM# (your CH340’s number)

7. Click the Upload button (right arrow icon)

What should happen:

• Arduino IDE says “Compiling sketch…”
• Then “Uploading…”
• Progress bar reaches 100%
• Says “Done uploading”
• The LED on your Arduino starts blinking!

If it works: Congratulations! Your CH340 driver is perfectly installed and working!

If it fails: Don’t panic – check the troubleshooting section. Most upload problems are about wiring or wrong settings, not the driver.

What to Do If Verification Fails

If any of these tests failed, here are quick fixes to try:

❌ Device appears with error in Device Manager:

• Try Method 3 installation (manual driver selection)
• Check if Windows Update installed a wrong driver over yours
• See the troubleshooting section

❌ Device keeps disconnecting:

• Try a different USB cable
• Try a different USB port
• Try a powered USB hub
• Your device might be drawing too much power

❌ COM port doesn’t appear:

• Restart your computer
• Try unplugging all USB devices except CH340
• Check if another program is using the COM port

❌ Loopback test fails:

• Make sure TX and RX are actually connected with the jumper
• Try different baud rates (9600, 115200)
• Your CH340 hardware might be faulty

❌ Arduino upload fails:

• Check TX/RX wiring (very commonly swapped!)
• Verify board settings in Arduino IDE
• See the comprehensive troubleshooting section for upload errors

Once you’ve verified everything works, you’re ready to start using your CH340 for actual projects!

Uninstall Conflicting Drivers (If Needed)

Tried installing the CH340 driver before and it didn’t work? Old, incomplete, or wrong driver installations can cause problems.

When to uninstall old drivers:

• You previously installed a different version
• The device worked before but stopped working
• You see multiple “Unknown Device” entries in Device Manager
• Previous installation attempts failed

How to completely remove old drivers:

1. Open Device Manager (Windows Key + X → Device Manager)
2. Click View at the top → Select “Show hidden devices”
3. Look for any entries related to CH340, even grayed-out ones
4. Right-click each one → “Uninstall device”
5. IMPORTANT: Check the box that says “Delete the driver software for this device”
6. Click Uninstall
7. Repeat for all CH340-related entries
8. Unplug the device
9. Restart your computer

Fresh start: After restarting, your system is clean. Now you can install the driver properly without conflicts.

CH340G converter connection and pinout for programming