You need to press and hold Reset button on Arduino Pro Mini board during programming because CH340 module does not have DTR output pin.Congratulations, you have successfully programmed the Arduino Pro Mini ! The built-in LED on Arduino Pro Mini board should start blinking by now.ġ0. You’ll notice the LEDs on CH340 module will start flashing for a while, this is indicating the CH340 is uploading program to Arduino Pro Mini. During the upload process, press and hold the Reset button on Arduino Pro Mini, then release it immediately once you see the Arduino IDE passed the compilation process as shown below (full green progress bar and 2 lines of white colored feedback messages). After all the configuration steps, you may upload the Blink program into your Arduino Pro Mini board as a test program by clicking Upload button.ĩ. You can check if this COM number is same as shown in the Port section of Device Manager.Ĩ. Make sure the COM port in Arduino IDE is selected, at Tools > Port > COMx. Before you upload the test program, make sure your Arduino IDE is configured to program the board, at Tools > Board > Arduino Pro or Pro Miniħ. Or you may type the code below into your Arduino IDE sketch area.Ħ. Open Arduino IDE in your computer, open an example code at File > Examples > 01.Basics > Blink. If not, you may manually install the CH340 driver by clicking hereĥ. If you are using Windows OS, make sure that your computer has CH340 driver installed, available at Start Menu > search “device manager” > Device Manager > Ports (COM & LPT). Make sure VCC pin on CH340 module is tied to 3v3 pin beside it. Connect the wires between CH340 module and Arduino Pro Mini as shown.ĬH340 serial module is connected to Arduino Pro Mini and computerĢ. USB Type-A Data Extension Cable (editor’s optional)Īrduino Pro Mini stacked on mini breadboard so it doesn’t move easily & scratch any surfacesġ.

Make sure the I/O pins of Arduino Pro Mini board are soldered with male header pins provided before proceeding. This tutorial will guide you how to program Arduino Pro Mini board with a cheap CH340 USB-to-TTL serial interface module. Ever wondered of shrinking your Arduino control system into minuscule scale? Arduino Pro Mini is introduced to serve this purpose, it can fit into anywhere in your project area where you want to hide it from sight, but it has no built-in serial interface chip like normal Arduino boards do.

Ch340 driver windows 7 arduino