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WeMos D1 Mini

Q&A Forum › Category: Arduino › WeMos D1 Mini
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Larry asked 2 years ago

So let me ask this question in another way, I have a few boards that have issues with the cable connector and would still like to use the board rather than throw them in the trash. I also have a ftdi program cable ,can someone tell me how I can connect this cable to a WeMos D1 mini and eliminate using the factory cable connection. If I can do that then I can still program the board,Thanks

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6 Answers
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Sara Santos Staff answered 2 years ago

Hi Larry.
 
Yes, I think you can do that by connecting the Wemos to the computer using an FTDI programmer.
 
To program the board via FTDI programmer, connect the board as follows:

  • RX (FTDI) – TX (GPIO 1)
  • TX (FTDI) – RX (GPIO 3)
  • VCC (FTDI) – VCC (3.3V)
  • GND (FTDI) – GND
  • GND – GPIO15
  • GND – GPIO0

 
Additionally, you may need to press the on-board RST button (if there is one on your board) to upload the code. After uploading, I think you can disconnect both GPIO 15 and GPIO 0 from GND.
 
I haven’t tried this. But, in theory, it should work.
 
It may also be helpful to take a look at this documentation: https://github.com/espressif/esptool/wiki/ESP8266-Boot-Mode-Selection.
I hope this helps.
Regards,
Sara

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Larry answered 2 years ago

     Thank you Sara, finally someone actually addressed the question or I made it clearer as to what I would like to attempt. 
     Others would just say it could not be done or dance around the question without actually addressing it. I really don’t care if it works, but if it does it would be great, otherwise i could just purchase what I needed. Again thank you for your answer.

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Larry answered 2 years ago

     Thank you Sara, finally someone actually addressed the question or I made it clearer as to what I would like to attempt. 
     Others would just say it could not be done or dance around the question without actually addressing it. I really don’t care if it works, but if it does it would be great, otherwise i could just purchase what I needed. Again thank you for your answer.

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Sara Santos Staff answered 2 years ago

That’s great!
I’m glad I could help.
Then, let me know if it worked.
Regards,
Sara

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Larry answered 2 years ago

So I tried your suggestion as to hook up to the chip and what I got was alot of garbage in the serial monitor, I changed the setting to 74800 and received:
est Jan 8 2013,rst cause:2 boot mode:(1,6).
I removed gnd to GP100 D3 and then ran the WiFi scan sketch and now I get my WiFi  as long as I am set up at 115200 which is what the sketch calls for.Thank you for the help, hope this helps others also. Next step is to migrate this to the Nano and make it WiFi capable. 

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Sara Santos Staff answered 1 year ago

Hi Larry.
That’s great news!
I’m glad it worked.
I’ll close this issue. If you need further help, you just need to open a new question in our forum.
Regards,
Sara