ESP8266 Community Forum

- Mon Feb 15, 2021 10:18 am #90522 Hi,

I recently received from Aliexpress 10 board Wemos D1 Mini Pro 16Mb.

The first weird thing I noticed was the high COM port detected when I connected the boards trough the USB cable. COM7 or higher.

I followed the usual procedure to upload a simple test sketch I used to program another Wemos (same version) with Arduino IDE.

When I upload the sketch, all seems ok. Led blynks, and Arduino IDE shows a normal upload process to 100%.

But the test code doesn't run.

This is the test code

Code: Select allvoid setup() {

  Serial.begin(9600);
}

void loop() {

  Serial.println("Hello");
  delay(1000);
}


This is how the program runs in my old Wemos


This pic shows the new Wemos received not working


My old wemos is detected in COM4


The new Wemos are detected at high COM ports


At first I tough it was a computer problem. The I installed Arduino IDE on another computer, configured for ESP8266, and tried to upload and run the same test skecth, but now, the COM port detected was COM4, but still the program doesn't run on the new Wemos boards.

Any ideas? I'm very frustrated, how it's possible to receive 10 boards with the same problem?

- Tue Feb 16, 2021 6:55 am #90531 You claim to have Wemos with 16 MB of memory, but you stubbornly set up 4 MB in the Arduino IDE. Why, for what reason? Did you try manual reset after uploading the program?

- Tue Feb 16, 2021 9:05 am #90537 Yes, you are right. I just used my usual IDE configuration for ESP8266 that worked with my other Wemos D1 Mini Pro 16Mb.

This is my old Wemos.


Back view


Now, I'll set up for Wemos D1 Mini Pro


Upload OK:


Test Running OK


Now, I'll do the same with one of the new Wemos

This is the Wemos received, It seems to be the same (I purchased the same Wemos Mini D1 Pro 16 Mb):


Picture of the back side. It looks the same


Plugging the new Wemos to the USB cable. COM port detected very high.


Upload seems normal. Blue led on board blinking.


But the simple test program doesn't run


When I press the reset button on the Wemos board, just show some garbage on the serial monitor.

- Tue Feb 16, 2021 10:47 am #90538 Could you set the baud rate of the serial monitor to 74880 Baud and reset the Wemos for us?
That would/could give you the actual error message.

SerialBaud.png

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Assumption is the mother of all f*ckups. At least: that's what I'm assuming.