ESP-WROOM-S2 boards not getting programmed

InaSusnoschi / train-A-wear

A wearable workout monitor that provides real time feedback on the user's posture to improve shape and exercise outcomes

GNU General Public License v3.0

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ESP-WROOM-S2 boards not getting programmed #13

Open dunker4o opened 5 years ago

dunker4o commented 5 years ago

ESP-WROOM-S2 based boards can't connect successfully to the programming toolchain.

Going through the internet suggest that the datasheet has provided wrong instructions for booting in UART download mode. It suggests pins IO15, IO2 and IO0 should all be set to LOW. Instead, IO2 should be HIGH, as per the following evident cases:

https://www.esp8266.com/viewtopic.php?f=13&t=18645 https://www.geekstips.com/esp8266-arduino-tutorial-iot-code-example/

dunker4o commented 5 years ago

One workaround is to solder a pull-up resistor between IO2 and the nearby 3V3 line. 10k resistor was used in our case:

IMG_20190411_224550

!! Remember to desolder the solder jumper on the bottom of the PCB which grounds IO2.

IMG_20190411_224645