ESP8266 Community Forum

Hello,
I'm using a WEMOS D1 Mini Pro with ADS1115, OLED 1.3", RTC and MicroSD module.
The circuit is soldered to a drilled board and works fine, except that the Reset-Button doesn't work as expected.

Pressing the RST-Button seems to crash the mcu but at least stops the output to the serial monitor after displaying a few "random characters".
No exception output.
Only disconnecting and reconnecting the usb cable recovers the serial output.
The reset pin isn't connected at all.
For testing I removed all modules (OLED, RTC, ADC, MicroSD) - same result ...

Also tested a ftdi232 for serial connection and powered the board from usb adapter - same result, except, that only disconnecting power restores serial output - restart of ftdi doesn't.
Tried to manually reset the wemos by connecting reset pin to GND - same result like pressing reset button..

Therefore I assume that pressing the reset button does crash the mcu ???
Is that possible?
How can i figure out what's going on?

The WEMOS D1 Mini Pro board has a pull-up resistor on the reset pin, but if you are using a custom board, you may need to add your own pull-up resistor to ensure that the reset pin is not floating. If the reset pin is floating, it could cause the MCU to reset unpredictably or not at all.

Here is also a design that may help in case you're making your own PCB. This is quite detailed. Layout, Garber file, test code etc. are given.

https://www.pcbway.com/project/sharepro ... 7414d.html