ESP8266 Community Forum

- Tue Feb 26, 2019 5:33 pm #80821 I have been prototyping on an ESP-01S module for some time using the Arduino IDE and this programmer.
https://www.ebay.co.uk/itm/ESP-01-ESP82 ... 2466871464

I thought I'd change to a module with FCC approval so bought some WROOM-02 modules from RS Components. I made up a board to convert the pins from the ESP-01 pinout to an adapter for the WROOM-02 (and yes I've checked all the wiring a million times but when I try to program it all I get is

warning: espcomm_sync failed

error: espcomm_open failed

error: espcomm_upload_mem failed

SPIFFS Upload failed!

Is there some subtle difference to the WROOM-02 I've missed. I bought three of them and they all have the same problem, and plugging the ESP-01S back in programs perfectly so I haven't broken the programmer.

Any suggestions gratefully received.

Mike

- Thu Feb 28, 2019 6:12 am #80848 Since posting this, I did discover that I need pullups on reset and enable as they seem to be different on the WROOM. I am now suspecting the difference is in the reset timing but still can't prove it.