Issue connecting CH340G to Arduino Pro Mini

Other Miscellaneous
1

Hi,

I am having issues uploading Arduino programs from my Windows machine to the Arduino Pro Mini via the CH340G.

Here’s what I’ve tried:

  • The CH340G shows up in my Device Manager (“COM3”) and the echo test on the CH340G does work (using the Arduino serial monitor.

  • I have made the following connections:

– CH340G VCC connected to APM VCC.

– CH340G GND connected to APM GND.

– CH340G TXO connected to APM RXI.

– CH340G RXI connected to APM TXO.

All connections are made using jumper cables on a breadboard.

There are no other connections made on either the CH340G or the APM at the moment.

This occurs with other CH340Gs and Arduinos, and with other cables.

Even when I try to upload the “Bare Minimum” code, I get the following error 10 times:

avrdude: stk500_recv(): programmer is not responding

avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x6a

Any other suggestions about what I can try to get this working? Thanks!

2

If you have the Arduino Pro Mini 5V version you will need to change the JP1 on CH340G to set for 5V instead the default 3v3 VCC output.

3

You need to connect the DTR pin to your pro mini as well to upload code.

4

paulvha:
If you have the Arduino Pro Mini 5V version you will need to change the JP1 on CH340G to set for 5V instead the default 3v3 VCC output.

Hi, Paul: Thanks for your response. This was a detail I forgot to add. I have changed JP1 to 5V on the CH340G.

5

YellowDog:
You need to connect the DTR pin to your pro mini as well to upload code.

Which pin do I connect to on the Pro Mini? Thanks, YellowDog!